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class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=%E7%89%B9%E5%88%A5:%E3%83%AD%E3%82%B0%E3%82%A4%E3%83%B3&returnto=%E7%A0%95%E5%B1%91%E7%89%A9" title="ログインすることを推奨します。ただし、必須ではありません。 [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>ログイン</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> ログアウトした編集者のページ <a href="/wiki/Wikipedia:%E3%82%A6%E3%82%A3%E3%82%AD%E3%83%9A%E3%83%87%E3%82%A3%E3%82%A2%E3%81%B8%E3%82%88%E3%81%86%E3%81%93%E3%81%9D" aria-label="編集の詳細"><span>もっと詳しく</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/%E7%89%B9%E5%88%A5:%E8%87%AA%E5%88%86%E3%81%AE%E6%8A%95%E7%A8%BF%E8%A8%98%E9%8C%B2" title="このIPアドレスからなされた編集の一覧 [y]" accesskey="y"><span>投稿記録</span></a></li><li id="pt-anontalk" 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class="vector-pinnable-header vector-toc-pinnable-header vector-pinnable-header-pinned" data-feature-name="toc-pinned" data-pinnable-element-id="vector-toc" > <h2 class="vector-pinnable-header-label">目次</h2> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-toc.pin">サイドバーに移動</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-toc.unpin">非表示</button> </div> <ul class="vector-toc-contents" id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">ページ先頭</div> </a> </li> <li id="toc-粒径による砕屑物の分類" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#粒径による砕屑物の分類"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>粒径による砕屑物の分類</span> </div> </a> <button aria-controls="toc-粒径による砕屑物の分類-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>粒径による砕屑物の分類サブセクションを切り替えます</span> </button> <ul id="toc-粒径による砕屑物の分類-sublist" class="vector-toc-list"> <li id="toc-国際土壌学会法による粒径区分" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#国際土壌学会法による粒径区分"> <div class="vector-toc-text"> <span class="vector-toc-numb">1.1</span> <span>国際土壌学会法による粒径区分</span> </div> </a> <ul id="toc-国際土壌学会法による粒径区分-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-火山砕屑物" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#火山砕屑物"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>火山砕屑物</span> </div> </a> <ul id="toc-火山砕屑物-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-脚注" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#脚注"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>脚注</span> </div> </a> <ul id="toc-脚注-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-関連項目" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#関連項目"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>関連項目</span> </div> </a> <ul id="toc-関連項目-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-参考文献" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#参考文献"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>参考文献</span> </div> </a> <ul id="toc-参考文献-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="目次" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="目次の表示・非表示を切り替え" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">目次の表示・非表示を切り替え</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">砕屑物</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="特定の記事の別の言語版に移動します。利用可能な言語11件" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-11" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">11の言語版</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ce mw-list-item"><a href="https://ce.wikipedia.org/wiki/%D0%94%D1%80%D0%B5%D1%81%D0%B2%D0%B0" title="チェチェン語: Дресва" lang="ce" hreflang="ce" data-title="Дресва" data-language-autonym="Нохчийн" data-language-local-name="チェチェン語" class="interlanguage-link-target"><span>Нохчийн</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Verwitterungsgrus" title="ドイツ語: Verwitterungsgrus" lang="de" hreflang="de" data-title="Verwitterungsgrus" data-language-autonym="Deutsch" data-language-local-name="ドイツ語" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-en mw-list-item"><a href="https://en.wikipedia.org/wiki/Grus_(geology)" title="英語: Grus (geology)" lang="en" hreflang="en" data-title="Grus (geology)" data-language-autonym="English" data-language-local-name="英語" class="interlanguage-link-target"><span>English</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Gruzo_(geologio)" title="エスペラント語: Gruzo (geologio)" lang="eo" hreflang="eo" data-title="Gruzo (geologio)" data-language-autonym="Esperanto" data-language-local-name="エスペラント語" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Grus_(geolog%C3%ADa)" title="スペイン語: Grus (geología)" lang="es" hreflang="es" data-title="Grus (geología)" data-language-autonym="Español" data-language-local-name="スペイン語" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Ar%C3%A8ne_(g%C3%A9ologie)" title="フランス語: Arène (géologie)" lang="fr" hreflang="fr" data-title="Arène (géologie)" data-language-autonym="Français" data-language-local-name="フランス語" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%93%D7%98%D7%A8%D7%99%D7%98%D7%99" title="ヘブライ語: דטריטי" lang="he" hreflang="he" data-title="דטריטי" data-language-autonym="עברית" data-language-local-name="ヘブライ語" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%94%D1%80%D0%B5%D1%81%D0%B2%D0%B0" title="ロシア語: Дресва" lang="ru" hreflang="ru" data-title="Дресва" data-language-autonym="Русский" data-language-local-name="ロシア語" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sah mw-list-item"><a href="https://sah.wikipedia.org/wiki/%D0%94%D1%8D%D1%80%D0%B8%D1%8D%D1%81%D0%BF%D1%8D" title="サハ語: Дэриэспэ" lang="sah" hreflang="sah" data-title="Дэриэспэ" data-language-autonym="Саха тыла" data-language-local-name="サハ語" class="interlanguage-link-target"><span>Саха тыла</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/%D0%96%D0%BE%D1%80%D1%81%D1%82%D0%B2%D0%B0" title="ウクライナ語: Жорства" lang="uk" hreflang="uk" data-title="Жорства" data-language-autonym="Українська" data-language-local-name="ウクライナ語" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Dresva" title="ウズベク語: Dresva" lang="uz" hreflang="uz" data-title="Dresva" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="ウズベク語" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit wb-langlinks-link"><a href="https://www.wikidata.org/wiki/Special:EntityPage/Q473412#sitelinks-wikipedia" title="言語間リンクを編集" class="wbc-editpage">リンクを編集</a></span></div> </div> </div> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="名前空間"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/%E7%A0%95%E5%B1%91%E7%89%A9" title="本文を閲覧 [c]" accesskey="c"><span>ページ</span></a></li><li id="ca-talk" class="new vector-tab-noicon mw-list-item"><a href="/w/index.php?title=%E3%83%8E%E3%83%BC%E3%83%88:%E7%A0%95%E5%B1%91%E7%89%A9&action=edit&redlink=1" rel="discussion" class="new" title="「本文ページについての議論」 (存在しないページ) [t]" accesskey="t"><span>ノート</span></a></li> </ul> </div> </div> <div id="vector-variants-dropdown" class="vector-dropdown emptyPortlet" > <input type="checkbox" id="vector-variants-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-variants-dropdown" class="vector-dropdown-checkbox " aria-label="別の言語に切り替える" > <label 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</label> <div class="vector-dropdown-content"> <div id="vector-page-tools-unpinned-container" class="vector-unpinned-container"> <div id="vector-page-tools" class="vector-page-tools vector-pinnable-element"> <div class="vector-pinnable-header vector-page-tools-pinnable-header vector-pinnable-header-unpinned" data-feature-name="page-tools-pinned" data-pinnable-element-id="vector-page-tools" data-pinned-container-id="vector-page-tools-pinned-container" data-unpinned-container-id="vector-page-tools-unpinned-container" > <div class="vector-pinnable-header-label">ツール</div> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-pin-button" data-event-name="pinnable-header.vector-page-tools.pin">サイドバーに移動</button> <button class="vector-pinnable-header-toggle-button vector-pinnable-header-unpin-button" data-event-name="pinnable-header.vector-page-tools.unpin">非表示</button> </div> <div id="p-cactions" class="vector-menu mw-portlet mw-portlet-cactions emptyPortlet vector-has-collapsible-items" title="その他の操作" > <div class="vector-menu-heading"> 操作 </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-more-view" class="selected vector-more-collapsible-item mw-list-item"><a href="/wiki/%E7%A0%95%E5%B1%91%E7%89%A9"><span>閲覧</span></a></li><li id="ca-more-edit" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=%E7%A0%95%E5%B1%91%E7%89%A9&action=edit" title="このページのソースコードを編集する [e]" accesskey="e"><span>編集</span></a></li><li id="ca-more-history" class="vector-more-collapsible-item mw-list-item"><a href="/w/index.php?title=%E7%A0%95%E5%B1%91%E7%89%A9&action=history"><span>履歴表示</span></a></li> </ul> </div> </div> <div id="p-tb" class="vector-menu mw-portlet mw-portlet-tb" > <div class="vector-menu-heading"> 全般 </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="t-whatlinkshere" class="mw-list-item"><a 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フリー百科事典『ウィキペディア（Wikipedia）』</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="ja" dir="ltr"><style data-mw-deduplicate="TemplateStyles:r101304250">.mw-parser-output .ambox{border:1px solid #a2a9b1;border-left:10px solid #36c;background-color:#fbfbfb;box-sizing:border-box}.mw-parser-output .ambox+link+.ambox,.mw-parser-output .ambox+link+style+.ambox,.mw-parser-output .ambox+link+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+style+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+link+.ambox{margin-top:-1px}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}.mw-parser-output .ambox-speedy{border-left:10px solid #b32424;background-color:#fee7e6}.mw-parser-output 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ambox-content ambox-出典の明記" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><span><img src="//upload.wikimedia.org/wikipedia/commons/thumb/6/64/Question_book-4.svg/50px-Question_book-4.svg.png" decoding="async" width="50" height="39" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/64/Question_book-4.svg/75px-Question_book-4.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/64/Question_book-4.svg/100px-Question_book-4.svg.png 2x" data-file-width="262" data-file-height="204" /></span></span></div></td><td class="mbox-text"><div class="mbox-text-span"><b>この記事は<a href="/wiki/Wikipedia:%E6%A4%9C%E8%A8%BC%E5%8F%AF%E8%83%BD%E6%80%A7" title="Wikipedia:検証可能性">検証可能</a>な<a href="/wiki/Wikipedia:%E4%BF%A1%E9%A0%BC%E3%81%A7%E3%81%8D%E3%82%8B%E6%83%85%E5%A0%B1%E6%BA%90" title="Wikipedia:信頼できる情報源">参考文献や出典</a>が全く示されていないか、不十分です。</b><span class="hide-when-compact"> <a href="/wiki/Wikipedia:%E5%87%BA%E5%85%B8%E3%82%92%E6%98%8E%E8%A8%98%E3%81%99%E3%82%8B" title="Wikipedia:出典を明記する">出典を追加</a>して記事の信頼性向上にご協力ください。<small>（<a href="/wiki/Template:%E5%87%BA%E5%85%B8%E3%81%AE%E6%98%8E%E8%A8%98/doc" title="Template:出典の明記/doc">このテンプレートの使い方</a>）</small><br /><small><span class="plainlinks">出典検索<a href="/wiki/Template:Find_sources_mainspace" title="Template:Find sources mainspace"><sup>?</sup></a>: <a rel="nofollow" class="external text" href="//www.google.co.jp/search?hl=ja&as_eq=wikipedia&q=%22%E7%A0%95%E5%B1%91%E7%89%A9%22&num=50">"砕屑物"</a> – <a rel="nofollow" class="external text" href="//www.google.co.jp/search?hl=ja&q=%22%E7%A0%95%E5%B1%91%E7%89%A9%22&tbm=nws">ニュース</a> <b>·</b> <a rel="nofollow" class="external text" href="//www.google.co.jp/search?hl=ja&tbs=bks:1&q=%22%E7%A0%95%E5%B1%91%E7%89%A9%22">書籍</a> <b>·</b> <a rel="nofollow" class="external text" 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href="https://wikipedialibrary.wmflabs.org/partners/">TWL</a></span></small></span> <span class="date-container"><i>(<span class="date"><span title="2019年2月">2019年2月</span></span>)</i></span></div></td></tr></tbody></table> <p><b>砕屑物</b>（さいせつぶつ、<a href="/wiki/%E8%8B%B1%E8%AA%9E" title="英語">英</a>: <span lang="en">clastics</span><sup id="cite_ref-terms_1-0" class="reference"><a href="#cite_note-terms-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>、<span lang="en">detritus</span><sup id="cite_ref-terms_1-1" class="reference"><a href="#cite_note-terms-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>）とは、<a href="/wiki/%E5%B2%A9%E7%9F%B3" title="岩石">岩石</a>が壊れてできた破片や<a href="/wiki/%E7%B2%92%E5%AD%90" title="粒子">粒子</a>を指す<a href="/wiki/%E5%9C%B0%E8%B3%AA%E5%AD%A6" title="地質学">地質学</a>用語。<a href="/wiki/%E6%B3%A5" title="泥">泥</a>や<a href="/wiki/%E7%A0%82" title="砂">砂</a>や<a href="/wiki/%E7%A4%AB" title="礫">礫</a>がこれにあたるが、砂は粗砂と細砂、泥は<a href="/wiki/%E3%82%B7%E3%83%AB%E3%83%88" title="シルト">シルト</a>と<a href="/wiki/%E7%B2%98%E5%9C%9F" title="粘土">粘土</a>に大別することができる。 </p><p>砕屑物によって構成されている<a href="/wiki/%E5%A0%86%E7%A9%8D%E5%B2%A9" title="堆積岩">堆積岩</a>を<a href="/wiki/%E7%A0%95%E5%B1%91%E5%B2%A9" title="砕屑岩">砕屑岩</a>と呼ぶ。 </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="粒径による砕屑物の分類"><span id=".E7.B2.92.E5.BE.84.E3.81.AB.E3.82.88.E3.82.8B.E7.A0.95.E5.B1.91.E7.89.A9.E3.81.AE.E5.88.86.E9.A1.9E"></span>粒径による砕屑物の分類</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E7%A0%95%E5%B1%91%E7%89%A9&action=edit&section=1" title="節を編集: 粒径による砕屑物の分類"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>砕屑粒子は<a href="/wiki/%E7%B2%92%E5%BE%84" title="粒径">粒径</a>により区分され、その区分に従って砕屑岩などを分類することで定量的に表現される。粒径による分類方法は、等比数級的な境界を人為的に設け、系統化した説明が容易なウェントウォースらに基づく粒度階区分（Wentworth's grade scale）を基本とし、必要に応じて適切な分類が個別に定義される。 </p><p>砕屑性堆積岩においては、粒度と性質の差異の相関性が良く、<a href="/wiki/%E5%A0%86%E7%A9%8D%E7%89%A9" title="堆積物">堆積物</a>の生成過程（<a href="/wiki/%E4%BE%B5%E9%A3%9F" title="侵食">侵食</a>、<a href="/wiki/%E9%81%8B%E6%90%AC" title="運搬">運搬</a>、<a href="/wiki/%E5%A0%86%E7%A9%8D" title="堆積">堆積</a>などの<a href="/wiki/%E7%92%B0%E5%A2%83" title="環境">環境</a>）との関係では欠かせない分類であり、また<a href="/wiki/%E7%A7%91%E5%AD%A6" title="科学">科学</a>的性質についても<a href="/wiki/%E9%89%B1%E7%89%A9" title="鉱物">鉱物</a>の残存あるいは<a href="/wiki/%E7%B2%98%E5%9C%9F%E9%89%B1%E7%89%A9" title="粘土鉱物">粘土鉱物</a>化した関係性が大まかに表現できる。 </p> <table class="wikitable"> <caption>ウェントウォース粒度区分による分類 </caption> <tbody><tr> <th>粒径（mm）</th> <th>φ（ファイ）</th> <th>粒子の区分</th> <th colspan="2"><b>砕屑物</b>（<a href="/wiki/%E7%A0%95%E5%B1%91%E5%B2%A9" title="砕屑岩">砕屑岩</a>）</th> <th colspan="2"><a href="/wiki/%E7%81%AB%E5%B1%B1%E7%A0%95%E5%B1%91%E7%89%A9" title="火山砕屑物">火山砕屑物</a> </th></tr> <tr> <td>256以上</td> <td>-8以下</td> <td><a href="/wiki/%E5%B7%A8%E7%A4%AB" title="巨礫">巨礫</a></td> <td rowspan="4" colspan="2"><a href="/wiki/%E7%A4%AB" title="礫">礫</a>（<a href="/wiki/%E7%A4%AB%E5%B2%A9" title="礫岩">礫岩</a>）</td> <td rowspan="2" colspan="2"><a href="/wiki/%E7%81%AB%E5%B1%B1%E5%B2%A9%E5%A1%8A" title="火山岩塊">火山岩塊</a> </td></tr> <tr> <td>64</td> <td>-6</td> <td><a href="/w/index.php?title=%E5%A4%A7%E7%A4%AB&action=edit&redlink=1" class="new" title="「大礫」 (存在しないページ)">大礫</a> </td></tr> <tr> <td>4</td> <td>-2</td> <td><a href="/w/index.php?title=%E4%B8%AD%E7%A4%AB&action=edit&redlink=1" class="new" title="「中礫」 (存在しないページ)">中礫</a></td> <td rowspan="2" colspan="2"><a href="/wiki/%E7%81%AB%E5%B1%B1%E7%A4%AB" title="火山礫">火山礫</a> </td></tr> <tr> <td>2</td> <td>-1</td> <td><a href="/w/index.php?title=%E7%B4%B0%E7%A4%AB&action=edit&redlink=1" class="new" title="「細礫」 (存在しないページ)">細礫</a> </td></tr> <tr> <td>1</td> <td>0</td> <td><a href="/w/index.php?title=%E6%A5%B5%E7%B2%97%E7%B2%92%E7%A0%82&action=edit&redlink=1" class="new" title="「極粗粒砂」 (存在しないページ)">極粗粒砂</a></td> <td rowspan="5" colspan="2"><a href="/wiki/%E7%A0%82" title="砂">砂</a>（<a href="/wiki/%E7%A0%82%E5%B2%A9" title="砂岩">砂岩</a>）</td> <td rowspan="5"><a href="/w/index.php?title=%E7%B2%97%E7%B2%92%E7%81%AB%E5%B1%B1%E7%81%B0&action=edit&redlink=1" class="new" title="「粗粒火山灰」 (存在しないページ)">粗粒火山灰</a>（火山砂）</td> <td rowspan="10"><a href="/wiki/%E7%81%AB%E5%B1%B1%E7%81%B0" title="火山灰">火山灰</a> </td></tr> <tr> <td>0.5（1/2）</td> <td>1</td> <td><a href="/w/index.php?title=%E7%B2%97%E7%B2%92%E7%A0%82&action=edit&redlink=1" class="new" title="「粗粒砂」 (存在しないページ)">粗粒砂</a> </td></tr> <tr> <td>0.25（1/4）</td> <td>2</td> <td><a href="/w/index.php?title=%E4%B8%AD%E7%B2%92%E7%A0%82&action=edit&redlink=1" class="new" title="「中粒砂」 (存在しないページ)">中粒砂</a> </td></tr> <tr> <td>0.125（1/8）</td> <td>3</td> <td><a href="/w/index.php?title=%E7%B4%B0%E7%B2%92%E7%A0%82&action=edit&redlink=1" class="new" title="「細粒砂」 (存在しないページ)">細粒砂</a> </td></tr> <tr> <td>0.063（1/16）</td> <td>4</td> <td><a href="/w/index.php?title=%E6%A5%B5%E7%B4%B0%E7%B2%92%E7%A0%82&action=edit&redlink=1" class="new" title="「極細粒砂」 (存在しないページ)">極細粒砂</a> </td></tr> <tr> <td>0.032（1/32）</td> <td>5</td> <td><a href="/w/index.php?title=%E7%B2%97%E7%B2%92%E3%82%B7%E3%83%AB%E3%83%88&action=edit&redlink=1" class="new" title="「粗粒シルト」 (存在しないページ)">粗粒シルト</a></td> <td rowspan="4"><a href="/wiki/%E3%82%B7%E3%83%AB%E3%83%88" title="シルト">シルト</a>（<a href="/wiki/%E3%82%B7%E3%83%AB%E3%83%88%E5%B2%A9" class="mw-redirect" title="シルト岩">シルト岩</a>）</td> <td rowspan="5"><a href="/wiki/%E6%B3%A5" title="泥">泥</a>（<a href="/wiki/%E6%B3%A5%E5%B2%A9" title="泥岩">泥岩</a>）</td> <td rowspan="5"><a href="/w/index.php?title=%E7%B4%B0%E7%B2%92%E7%81%AB%E5%B1%B1%E7%81%B0&action=edit&redlink=1" class="new" title="「細粒火山灰」 (存在しないページ)">細粒火山灰</a>（火山シルト） </td></tr> <tr> <td>0.016（1/64）</td> <td>6</td> <td><a href="/w/index.php?title=%E4%B8%AD%E7%B2%92%E3%82%B7%E3%83%AB%E3%83%88&action=edit&redlink=1" class="new" title="「中粒シルト」 (存在しないページ)">中粒シルト</a> </td></tr> <tr> <td>0.008（1/128）</td> <td>7</td> <td><a href="/w/index.php?title=%E7%B4%B0%E7%B2%92%E3%82%B7%E3%83%AB%E3%83%88&action=edit&redlink=1" class="new" title="「細粒シルト」 (存在しないページ)">細粒シルト</a> </td></tr> <tr> <td>0.004（1/256）</td> <td>8</td> <td><a href="/w/index.php?title=%E6%A5%B5%E7%B4%B0%E7%B2%92%E3%82%B7%E3%83%AB%E3%83%88&action=edit&redlink=1" class="new" title="「極細粒シルト」 (存在しないページ)">極細粒シルト</a> </td></tr> <tr> <td>0.004以下</td> <td>8以上</td> <td><a href="/wiki/%E7%B2%98%E5%9C%9F" title="粘土">粘土</a></td> <td><a href="/wiki/%E7%B2%98%E5%9C%9F" title="粘土">粘土</a>（<a href="/wiki/%E7%B2%98%E5%9C%9F%E5%B2%A9" class="mw-redirect" title="粘土岩">粘土岩</a>） </td></tr></tbody></table> <p>この粒径区分では、<span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \phi }"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>ϕ</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \phi }</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/72b1f30316670aee6270a28334bdf4f5072cdde4" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:1.385ex; height:2.509ex;" alt="{\displaystyle \phi }"></span>は以下の式で求められる<sup id="cite_ref-FOOTNOTE指田ほか200738_2-0" class="reference"><a href="#cite_note-FOOTNOTE指田ほか200738-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup>。 </p><p><span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \phi =-\log _{2}{\frac {d}{d_{0}}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>ϕ</mi> <mo>=</mo> <mo>−</mo> <msub> <mi>log</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> </msub> <mo>⁡</mo> <mrow class="MJX-TeXAtom-ORD"> <mfrac> <mi>d</mi> <msub> <mi>d</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </mfrac> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle \phi =-\log _{2}{\frac {d}{d_{0}}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/c0147686d08c3e8fdd3bc124a44ddb49f1b0a080" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.338ex; width:14.191ex; height:5.843ex;" alt="{\displaystyle \phi =-\log _{2}{\frac {d}{d_{0}}}}"></span>（<span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle d}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mi>d</mi> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle d}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/e85ff03cbe0c7341af6b982e47e9f90d235c66ab" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.216ex; height:2.176ex;" alt="{\displaystyle d}"></span>：粒径[mm]、<span class="mwe-math-element"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle d_{0}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <msub> <mi>d</mi> <mrow class="MJX-TeXAtom-ORD"> <mn>0</mn> </mrow> </msub> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle d_{0}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/4740381c16ea98c4132510daa642e93c1e42c049" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:2.263ex; height:2.509ex;" alt="{\displaystyle d_{0}}"></span>：1 mm） </p><p>粒径の明確な境界はなく、優勢な方へ区分し、必要に応じて適切な区分が新たに設定される。特に礫と砂の粒径2mmとする境は4mmに設定されることもしばしばある。 </p><p>他の堆積岩の分類は、<a href="/wiki/%E7%81%AB%E5%B1%B1%E7%A0%95%E5%B1%91%E5%B2%A9" title="火山砕屑岩">火山砕屑岩</a>、生物起源、科学的性質などで分けられる。なお、<a href="/wiki/%E5%B2%A9%E7%9B%A4" class="mw-redirect" title="岩盤">岩盤</a>分類については、砕屑性堆積岩の対応性は良いが一概には表現されないため、目的別や適用方法によって多種多様な分類が用いられる。 </p> <div class="mw-heading mw-heading3"><h3 id="国際土壌学会法による粒径区分"><span id=".E5.9B.BD.E9.9A.9B.E5.9C.9F.E5.A3.8C.E5.AD.A6.E4.BC.9A.E6.B3.95.E3.81.AB.E3.82.88.E3.82.8B.E7.B2.92.E5.BE.84.E5.8C.BA.E5.88.86"></span>国際土壌学会法による粒径区分</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E7%A0%95%E5%B1%91%E7%89%A9&action=edit&section=2" title="節を編集: 国際土壌学会法による粒径区分"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/w/index.php?title=%E5%9B%BD%E9%9A%9B%E5%9C%9F%E5%A3%8C%E5%AD%A6%E4%BC%9A%E6%B3%95&action=edit&redlink=1" class="new" title="「国際土壌学会法」 (存在しないページ)">国際土壌学会法</a>による粒径区分では、砕屑物は次のように分類される。 </p> <ul><li><a href="/wiki/%E7%A4%AB" title="礫">礫</a> : 2mm以上のもの</li> <li><a href="/wiki/%E7%B2%97%E7%A0%82" class="mw-redirect" title="粗砂">粗砂</a> : 2 - 0.2mmのもの</li> <li><a href="/wiki/%E7%B4%B0%E7%A0%82" class="mw-redirect" title="細砂">細砂</a> : 0.2 - 0.02mmのもの</li> <li><a href="/wiki/%E3%82%B7%E3%83%AB%E3%83%88" title="シルト">シルト</a> : 0.02 - 0.002mmのもの</li> <li><a href="/wiki/%E7%B2%98%E5%9C%9F" title="粘土">粘土</a> : 0.002mm未満のもの</li></ul> <div class="mw-heading mw-heading2"><h2 id="火山砕屑物"><span id=".E7.81.AB.E5.B1.B1.E7.A0.95.E5.B1.91.E7.89.A9"></span>火山砕屑物</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E7%A0%95%E5%B1%91%E7%89%A9&action=edit&section=3" title="節を編集: 火山砕屑物"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="rellink" style="margin-bottom: 0.5em; padding-left: 2em; font-size: 90%;" role="note">→詳細は「<a href="/wiki/%E7%81%AB%E5%B1%B1%E7%A0%95%E5%B1%91%E7%89%A9" title="火山砕屑物">火山砕屑物</a>」を参照</div> <p><a href="/wiki/%E7%81%AB%E5%B1%B1" title="火山">火山</a>起源の砕屑物（<a href="/wiki/%E7%81%AB%E5%B1%B1%E7%81%B0" title="火山灰">火山灰</a>や<a href="/wiki/%E8%BB%BD%E7%9F%B3" title="軽石">軽石</a>など）は<a href="/wiki/%E7%81%AB%E5%B1%B1%E7%A0%95%E5%B1%91%E7%89%A9" title="火山砕屑物">火山砕屑物</a>（火砕物）という。 </p><p>火山砕屑物における粒径の区分では個別に飛散距離の区分が加えられ、具体的には<a href="/wiki/%E3%83%8F%E3%82%B6%E3%83%BC%E3%83%89%E3%83%9E%E3%83%83%E3%83%97" title="ハザードマップ">ハザードマップ</a>が作成される。ここでも粒径2mmの境界については、発泡した軽量な粒子は遠くまで飛散することから4mmと定義することもある。粒度区分については標準的な分類を基本とするが、状況に応じて適切な設定が設けられる。 </p> <div class="mw-heading mw-heading2"><h2 id="脚注"><span id=".E8.84.9A.E6.B3.A8"></span>脚注</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E7%A0%95%E5%B1%91%E7%89%A9&action=edit&section=4" title="節を編集: 脚注"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="noprint" style="float:right; font-size:90%;">[<a href="/wiki/Help:%E8%84%9A%E6%B3%A8/%E8%AA%AD%E8%80%85%E5%90%91%E3%81%91" title="Help:脚注/読者向け"><span title="この欄の操作法">脚注の使い方</span></a>]</div> <div class="reflist" style="list-style-type: decimal;"> <ol class="references"> <li id="cite_note-terms-1">^ <a href="#cite_ref-terms_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-terms_1-1"><sup><i><b>b</b></i></sup></a> <span class="reference-text"><cite style="font-style:normal" class="citation book"><a href="/wiki/%E6%96%87%E9%83%A8%E7%9C%81" title="文部省">文部省</a> 編『<a rel="nofollow" class="external text" href="http://sciterm.nii.ac.jp/cgi-bin/reference.cgi">学術用語集地学編</a>』<a href="/wiki/%E6%97%A5%E6%9C%AC%E5%AD%A6%E8%A1%93%E6%8C%AF%E8%88%88%E4%BC%9A" title="日本学術振興会">日本学術振興会</a>、1984年、119頁。<style data-mw-deduplicate="TemplateStyles:r101121245">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation.cs-ja1 q,.mw-parser-output .citation.cs-ja2 q{quotes:"「""」""『""』"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free a,.mw-parser-output .citation .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited a,.mw-parser-output .id-lock-registration a,.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription a,.mw-parser-output .citation .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:var(--color-success,#3a3);margin-left:0.3em}.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}</style><a href="/wiki/ISBN" title="ISBN">ISBN</a> <a href="/wiki/%E7%89%B9%E5%88%A5:%E6%96%87%E7%8C%AE%E8%B3%87%E6%96%99/4-8181-8401-2" title="特別:文献資料/4-8181-8401-2">4-8181-8401-2</a><span style="display:none;">。<a rel="nofollow" class="external free" href="http://sciterm.nii.ac.jp/cgi-bin/reference.cgi">http://sciterm.nii.ac.jp/cgi-bin/reference.cgi</a></span>。</cite><span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=%E5%AD%A6%E8%A1%93%E7%94%A8%E8%AA%9E%E9%9B%86+%E5%9C%B0%E5%AD%A6%E7%B7%A8&rft.date=1984&rft.pages=119%E9%A0%81&rft.pub=%5B%5B%E6%97%A5%E6%9C%AC%E5%AD%A6%E8%A1%93%E6%8C%AF%E8%88%88%E4%BC%9A%5D%5D&rft.isbn=4-8181-8401-2&rft_id=http%3A%2F%2Fsciterm.nii.ac.jp%2Fcgi-bin%2Freference.cgi&rfr_id=info:sid/ja.wikipedia.org:%E7%A0%95%E5%B1%91%E7%89%A9"><span style="display: none;"> </span></span></span> </li> <li id="cite_note-FOOTNOTE指田ほか200738-2"><b><a href="#cite_ref-FOOTNOTE指田ほか200738_2-0">^</a></b> <span class="reference-text"><a href="#CITEREF指田ほか2007">指田ほか 2007</a>, p. 38.</span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="関連項目"><span id=".E9.96.A2.E9.80.A3.E9.A0.85.E7.9B.AE"></span>関連項目</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E7%A0%95%E5%B1%91%E7%89%A9&action=edit&section=5" title="節を編集: 関連項目"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r94202605">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:#f9f9f9;display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output .side-box-text{flex:1}}@media(min-width:720px){.mw-parser-output .side-box{width:238px}.mw-parser-output .side-box-right{clear:right;float:right;margin-left:1em}.mw-parser-output .side-box-left{margin-right:1em}}</style><div class="side-box side-box-right plainlinks sistersitebox noprint" style="width:22em;"> <div class="side-box-flex"> <div class="side-box-image"><span class="noviewer" typeof="mw:File"><span><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png" decoding="async" width="30" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/45px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Commons-logo.svg/59px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></span></span></div> <div class="side-box-text plainlist" style="font-size:100%;">ウィキメディア・コモンズには、<b><span class="plainlinks"><a class="external text" href="https://commons.wikimedia.org/wiki/Category:Sediments_by_particle_size?uselang=ja">砕屑物</a></span></b>に関連するカテゴリがあります。</div></div> </div> <ul><li><a href="/wiki/%E5%A0%86%E7%A9%8D%E7%89%A9" title="堆積物">堆積物</a></li> <li><a href="/wiki/%E5%B2%A9%E7%9F%B3" title="岩石">岩石</a> - <a href="/wiki/%E5%A0%86%E7%A9%8D%E5%B2%A9" title="堆積岩">堆積岩</a> - <a href="/wiki/%E7%A0%95%E5%B1%91%E5%B2%A9" title="砕屑岩">砕屑岩</a></li> <li><a href="/wiki/%E7%81%AB%E5%B1%B1%E7%A0%95%E5%B1%91%E7%89%A9" title="火山砕屑物">火山砕屑物</a> - <a href="/wiki/%E7%81%AB%E5%B1%B1%E7%A0%95%E5%B1%91%E5%B2%A9" title="火山砕屑岩">火山砕屑岩</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="参考文献"><span id=".E5.8F.82.E8.80.83.E6.96.87.E7.8C.AE"></span>参考文献</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=%E7%A0%95%E5%B1%91%E7%89%A9&action=edit&section=6" title="節を編集: 参考文献"><span>編集</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><cite style="font-style:normal" class="citation book"><a href="/wiki/%E5%9B%BD%E7%AB%8B%E5%A4%A9%E6%96%87%E5%8F%B0" title="国立天文台">国立天文台</a> 編「<a rel="nofollow" class="external text" href="https://web.archive.org/web/20060703125140/http://www.rikanenpyo.jp/">構成粒子の径と砕セツ岩</a>」『理科年表平成20年』<a href="/wiki/%E4%B8%B8%E5%96%84" class="mw-redirect mw-disambig" title="丸善">丸善</a>、2007年、654頁。<link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r101121245"><a href="/wiki/ISBN" title="ISBN">ISBN</a> <a href="/wiki/%E7%89%B9%E5%88%A5:%E6%96%87%E7%8C%AE%E8%B3%87%E6%96%99/978-4-621-07902-7" title="特別:文献資料/978-4-621-07902-7">978-4-621-07902-7</a><span style="display:none;">。<a rel="nofollow" class="external free" href="https://web.archive.org/web/20060703125140/http://www.rikanenpyo.jp/">https://web.archive.org/web/20060703125140/http://www.rikanenpyo.jp/</a></span>。</cite><span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.btitle=%E6%A7%8B%E6%88%90%E7%B2%92%E5%AD%90%E3%81%AE%E5%BE%84%E3%81%A8%E7%A0%95%E3%82%BB%E3%83%84%E5%B2%A9&rft.atitle=%E7%90%86%E7%A7%91%E5%B9%B4%E8%A1%A8+%E5%B9%B3%E6%88%9020%E5%B9%B4&rft.date=2007&rft.pages=654%E9%A0%81&rft.pub=%5B%5B%E4%B8%B8%E5%96%84%5D%5D&rft.isbn=978-4-621-07902-7&rft_id=https%3A%2F%2Fweb.archive.org%2Fweb%2F20060703125140%2Fhttp%3A%2F%2Fwww.rikanenpyo.jp%2F&rfr_id=info:sid/ja.wikipedia.org:%E7%A0%95%E5%B1%91%E7%89%A9"><span style="display: none;"> </span></span></li></ul> <ul><li><cite style="font-style:normal" class="citation book" id="CITEREF指田ほか2007">指田勝男・久田健一郎・角替敏昭・八木勇治・小室光世・興野純編『地球進化学』古今書院〈地球学シリーズ〉、2007年。<link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r101121245"><a href="/wiki/ISBN" title="ISBN">ISBN</a> <a href="/wiki/%E7%89%B9%E5%88%A5:%E6%96%87%E7%8C%AE%E8%B3%87%E6%96%99/978-4-7722-5204-1" title="特別:文献資料/978-4-7722-5204-1">978-4-7722-5204-1</a>。</cite><span class="Z3988" title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=%E5%9C%B0%E7%90%83%E9%80%B2%E5%8C%96%E5%AD%A6&rft.date=2007&rft.series=%E5%9C%B0%E7%90%83%E5%AD%A6%E3%82%B7%E3%83%AA%E3%83%BC%E3%82%BA&rft.pub=%E5%8F%A4%E4%BB%8A%E6%9B%B8%E9%99%A2&rft.isbn=978-4-7722-5204-1&rfr_id=info:sid/ja.wikipedia.org:%E7%A0%95%E5%B1%91%E7%89%A9"><span style="display: none;"> </span></span></li></ul> <table class="wikitable" style="margin:0 auto"> <caption>砕屑物と砕屑岩 </caption> <tbody><tr> <th>粒径 (mm)</th> <th colspan="2"><a class="mw-selflink selflink">砕屑物</a></th> <th colspan="2"><a href="/wiki/%E7%A0%95%E5%B1%91%E5%B2%A9" title="砕屑岩">砕屑岩</a></th> <th><a href="/wiki/%E7%81%AB%E5%B1%B1%E7%A0%95%E5%B1%91%E7%89%A9" title="火山砕屑物">火山砕屑物</a></th> <th><a href="/wiki/%E7%81%AB%E5%B1%B1%E7%A0%95%E5%B1%91%E5%B2%A9" title="火山砕屑岩">火山砕屑岩</a> </th></tr> <tr> <td>64 以上</td> <td rowspan="2" colspan="2"><a href="/wiki/%E7%A4%AB" title="礫">礫</a></td> <td rowspan="2" colspan="2"><a href="/wiki/%E7%A4%AB%E5%B2%A9" title="礫岩">礫岩</a></td> <td><a href="/wiki/%E7%81%AB%E5%B1%B1%E5%B2%A9%E5%A1%8A" title="火山岩塊">火山岩塊</a></td> <td><a href="/wiki/%E7%81%AB%E5%B1%B1%E8%A7%92%E7%A4%AB%E5%B2%A9" title="火山角礫岩">火山角礫岩</a>、<a href="/wiki/%E5%87%9D%E7%81%B0%E8%A7%92%E7%A4%AB%E5%B2%A9" title="凝灰角礫岩">凝灰角礫岩</a> </td></tr> <tr> <td>64 - 2</td> <td><a href="/wiki/%E7%81%AB%E5%B1%B1%E7%A4%AB" title="火山礫">火山礫</a></td> <td><a href="/wiki/%E3%83%A9%E3%83%94%E3%83%AA%E3%82%B9%E3%83%88%E3%83%BC%E3%83%B3" class="mw-redirect" title="ラピリストーン">ラピリストーン</a>、<a href="/w/index.php?title=%E7%81%AB%E5%B1%B1%E7%A4%AB%E5%87%9D%E7%81%B0%E5%B2%A9&action=edit&redlink=1" class="new" title="「火山礫凝灰岩」 (存在しないページ)">火山礫凝灰岩</a> </td></tr> <tr> <td>2 - <style data-mw-deduplicate="TemplateStyles:r89142581">.mw-parser-output .frac{white-space:nowrap}.mw-parser-output .frac .num,.mw-parser-output .frac .den{font-size:80%;line-height:0;vertical-align:super}.mw-parser-output .frac .den{vertical-align:sub}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}</style><span class="frac" role="math"><span class="num">1</span>⁄<span class="den">16</span></span></td> <td colspan="2"><a href="/wiki/%E7%A0%82" title="砂">砂</a></td> <td colspan="2"><a href="/wiki/%E7%A0%82%E5%B2%A9" title="砂岩">砂岩</a></td> <td rowspan="3"><a href="/wiki/%E7%81%AB%E5%B1%B1%E7%81%B0" title="火山灰">火山灰</a></td> <td rowspan="3"><a href="/wiki/%E5%87%9D%E7%81%B0%E5%B2%A9" title="凝灰岩">凝灰岩</a> </td></tr> <tr> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r89142581"><span class="frac" role="math"><span class="num">1</span>⁄<span class="den">16</span></span> - <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r89142581"><span class="frac" role="math"><span class="num">1</span>⁄<span class="den">256</span></span></td> <td><a href="/wiki/%E3%82%B7%E3%83%AB%E3%83%88" title="シルト">シルト</a></td> <td rowspan="2"><a href="/wiki/%E6%B3%A5" title="泥">泥</a></td> <td><a href="/wiki/%E3%82%B7%E3%83%AB%E3%83%88%E5%B2%A9" class="mw-redirect" title="シルト岩">シルト岩</a></td> <td rowspan="2"><a href="/wiki/%E6%B3%A5%E5%B2%A9" title="泥岩">泥岩</a> </td></tr> <tr> <td><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r89142581"><span class="frac" role="math"><span class="num">1</span>⁄<span class="den">256</span></span> 以下</td> <td><a href="/wiki/%E7%B2%98%E5%9C%9F" title="粘土">粘土</a></td> <td><a href="/wiki/%E7%B2%98%E5%9C%9F%E5%B2%A9" class="mw-redirect" title="粘土岩">粘土岩</a> </td></tr> <tr> <td style="text-align:right; font-size:smaller; background-color:white; border-color:transparent" colspan="7"><a href="/wiki/Template:%E7%A0%95%E5%B1%91%E7%89%A9%E3%81%A8%E7%A0%95%E5%B1%91%E5%B2%A9" title="Template:砕屑物と砕屑岩">テンプレートを表示</a> </td></tr></tbody></table>    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