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window.loswp.shouldDetectTimezone = true; window.loswp.shouldShowBulkDownload = true; window.loswp.showSignupCaptcha = false window.loswp.willEdgeCache = false; window.loswp.work = {"work":{"id":32186857,"created_at":"2017-04-01T10:05:22.831-07:00","from_world_paper_id":161608295,"updated_at":"2024-11-12T23:16:05.597-08:00","_data":{"grobid_abstract":"Oceanic sediments Cascadia basin Major and trace elements Uranium Continental crust weathering Oceanic sediments deposited at high rate close to continents are dominated by terrigenous material. Aside from dilution by biogenic components, their chemical compositions reflect those of nearby continental masses. This study focuses on oceanic sediments coming from the juvenile Canadian Cordillera and highlights systematic differences between detritus deriving from juvenile crust and detritus from old and mature crust. We report major and trace element concentrations for 68 sediments from the northernmost part of the Cascade forearc, drilled at ODP Sites 888 and 1027. The calculated weighted averages for each site can then be used in the future to quantify the contribution of subducted sediments to Cascades volcanism. The two sites have similar compositions but Site 888, located closer to the continent, has higher sandy turbidite contents and displays higher bulk SiO 2 /Al 2 O 3 with lower bulk Nb/Zr, attributed to the presence of zircons in the coarse sands. Comparison with published data for other oceanic sedimentary piles demonstrates the existence of systematic differences between modern sediments deriving from juvenile terranes (juvenile sediments) and modern sediments derived from mature continental areas (cratonic sediments). The most striking systematic difference is for Th/Nb, Th/U, Nb/U and Th/Rb ratios: juvenile sediments have much lower ratios than cratonic sediments. The small enrichment of Th over Nb in cratonic sediments may be explained by intracrustal magmatic and metamorphic differentiation processes. In contrast, their elevated Th/U and Nb/U ratios (average values of 6.87 and 7.95, respectively) in comparison to juvenile sediments (Th/U~3.09, Nb/U~5.15) suggest extensive U and Rb losses on old cratons. Uranium and Rb losses are attributed to long-term leaching by rain and river water during exposure of the continental crust at the surface. Over geological times, the weathering effects create a slow but systematic increase of Th/U with exposure time.","publication_date":"2013,,","publication_name":"Chemical Geology","grobid_abstract_attachment_id":"52420494"},"document_type":"paper","pre_hit_view_count_baseline":null,"quality":"high","language":"en","title":"Large U loss during weathering of upper continental crust: The sedimentary record","broadcastable":true,"draft":null,"has_indexable_attachment":true,"indexable":true}}["work"]; window.loswp.workCoauthors = [62411756]; window.loswp.locale = "en"; window.loswp.countryCode = "SG"; window.loswp.cwvAbTestBucket = ""; window.loswp.designVariant = "ds_vanilla"; window.loswp.fullPageMobileSutdModalVariant = "full_page_mobile_sutd_modal"; window.loswp.useOptimizedScribd4genScript = false; window.loswp.appleClientId = 'edu.academia.applesignon';</script><script defer="" src="https://accounts.google.com/gsi/client"></script><div class="ds-loswp-container"><div 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data-login_uri="https://www.academia.edu/registrations/google_one_tap" data-moment_callback="onGoogleOneTapEvent" id="g_id_onload"></div><div class="ds-top-related-works--grid-container"><div class="ds-related-content--container ds-top-related-works--container"><h2 class="ds-related-content--heading">Related papers</h2><div class="ds-related-work--container js-wsj-grid-card" data-collection-position="0" data-entity-id="37865044" data-sort-order="default"><a class="ds-related-work--title js-wsj-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/37865044/Uranium_Thorium_Rare_Earths_and_Other_Metals_in_Cretaceous_Age_Basement_Rocks_A_Source_for_New_Uranium_District_in_Tertiary_Age_Sediments_of_the_McCarthy_Basin_A_New_Middle_Cretaceous_Age_Impact_Crater_Eastern_Seward_Peninsula_Alaska">Uranium, Thorium, Rare Earths and Other Metals in Cretaceous Age Basement Rocks: A Source for New Uranium District in Tertiary Age Sediments of the McCarthy Basin (A New Middle 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data-collection-position="13" data-entity-id="77405344" data-sort-order="default"><a class="ds-related-work--title js-related-work-grid-card-title ds2-5-body-md ds2-5-body-link" href="https://www.academia.edu/77405344/Uranium_and_thorium_in_paleozoic_basalts_of_Nova_Scotia_Canada_">Uranium and thorium in paleozoic basalts of Nova Scotia (Canada)</a><div class="ds-related-work--metadata"><a class="js-related-work-grid-card-author ds2-5-body-sm ds2-5-body-link" data-author-id="33255192" href="https://smu-ca.academia.edu/JDostal">Jaroslav Dostal</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Bulletin Volcanologique, 1983</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" data-signup-modal="{"location":"wsj-grid-card-download-pdf-modal","work_title":"Uranium and thorium in paleozoic basalts of Nova Scotia 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