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[{"id":54178472,"identifier":"Attachment_54178472","shouldShowBulkDownload":false}]; window.loswp.shouldDetectTimezone = true; window.loswp.shouldShowBulkDownload = true; window.loswp.showSignupCaptcha = false window.loswp.willEdgeCache = false; window.loswp.work = {"work":{"id":34270271,"created_at":"2017-08-18T16:38:49.357-07:00","from_world_paper_id":163519393,"updated_at":"2024-11-14T19:17:25.711-08:00","_data":{"grobid_abstract":"Ion microprobe analyses of oxygen isotope ratios in Early Archean (Hadean) zircons (4.0-to 4.4-Ga) reveal variable magmatic ␦ 18 O values, including some that are high relative to the mantle, suggesting interaction between magmas and already-formed continental crust during the first 500 million yr of Earth's history. The high average ␦ 18 O value of these zircons is confirmed by conventional analysis. A metaconglomerate from the Jack Hills in the Yilgarn Craton (Western Australia) contains detrital zircons with ages Ͼ 4.0 Ga (Compston and Pidgeon, 1986) and one crystal that is 4.40-Ga old . The newly discovered 4.40-Ga grain is the oldest recognized terrestrial mineral. The Jack Hills metaconglomerate also contains a large 3.3-to 3.6-Ga-old zircon population with an average ␦ 18 O value of 6.3 Ϯ 0.1‰ (1 s.e., ; n ϭ 32 spot analyses). Two 4.15-Ga zircons have an average ␦ 18 O of 5.7 Ϯ 0.2‰ (n ϭ 13). In addition, a 4.13-Ga zircon has an average ␦ 18 O of 7.2 Ϯ 0.3‰ (n ϭ 8) and another 4.01-Ga zircon has an average ␦ 18 O of 6.8 Ϯ 0.4‰ (n ϭ 10). The oldest grain (4.40 Ga) is zoned with respect trace element composition (especially LREE), and intensity of cathodoluminescence, all of which correlate with oxygen isotope ratios (7.4‰ vs. 5.0‰). High LREE and high-␦ 18 O values from the 4.01-to 4.40-Ga grains are consistent with growth in evolved granitic magmas (␦ 18 O(WR) ϭ 8.5 to 9.5‰) that had interacted with supracrustal materials. High ␦ 18 O values show that low-temperature surficial processes (i.e., diagenesis, weathering, or low-temperature alteration) occurred before 4.0 Ga, and even before 4.40 Ga, shortly following the hypothesized date of core differentiation and impact of a Mars-sized body to form the Moon at ϳ4.45 Ga. This is the first evidence of continental crust as early as 4.40 Ga and suggests differentiation during the period of intense meteorite bombardment of the early Earth. The magnitude of water and rock interaction that would be necessary to cause the high ␦ 18 O values suggests the presence of liquid water and thus the possibility of an ocean at 4.40 Ga.","publication_date":"2001,5,1","publication_name":"Eleventh Annual V M Goldschmidt Conference","grobid_abstract_attachment_id":"54178472"},"document_type":"paper","pre_hit_view_count_baseline":null,"quality":"high","language":"en","title":"Liquid Water in the Early Archean: Ion Microprobe Evidence from Oxygen Isotopes in 4.01 to 4.40 Ga Detrital Zircons","broadcastable":true,"draft":null,"has_indexable_attachment":true,"indexable":true}}["work"]; window.loswp.workCoauthors = [55204412]; 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 = 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ds2-5-body-link" href="https://www.academia.edu/54641732/Early_Archean_crustal_evolution_of_the_Jack_Hills_Zircon_source_terrane_inferred_from_Lu_Hf_207Pb_206Pb_and_%CE%B418O_systematics_of_Jack_Hills_zircons">Early Archean crustal evolution of the Jack Hills Zircon source terrane inferred from Lu–Hf, 207Pb/206Pb, and δ18O systematics of Jack Hills zircons</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="31659913" href="https://independent.academia.edu/MalcolmTMcCulloch">Malcolm T McCulloch</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Geochimica et Cosmochimica Acta, 2011</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":"Early Archean crustal evolution of the Jack Hills Zircon source terrane inferred from Lu–Hf, 207Pb/206Pb, and δ18O systematics 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data-collection-position="7" data-entity-id="12356276" 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/12356276/Correlated_microanalysis_of_zircon_Trace_element_sup_18_sup_O_and_U_Th_Pb_isotopic_constraints_on_the_igneous_origin_of_complex_3900Ma_detrital_grains">Correlated microanalysis of zircon: Trace element, ��< sup> 18</sup> O, and U��Th��Pb isotopic constraints on the igneous origin of complex> 3900Ma detrital grains</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="31054590" href="https://wisc.academia.edu/JohnValley">John Valley</a></div><p class="ds-related-work--metadata ds2-5-body-xs">2006</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" 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ds2-5-body-xs">Geochimica et Cosmochimica Acta, 2009</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":"In situ U–Pb, O and Hf isotopic compositions of zircon and olivine from Eoarchaean rocks, West Greenland: New insights to making old crust","attachmentId":88743181,"attachmentType":"pdf","work_url":"https://www.academia.edu/83381913/In_situ_U_Pb_O_and_Hf_isotopic_compositions_of_zircon_and_olivine_from_Eoarchaean_rocks_West_Greenland_New_insights_to_making_old_crust","alternativeTracking":true}"><span class="material-symbols-outlined" style="font-size: 18px" translate="no">download</span><span class="ds2-5-text-link__content">Download free PDF</span></button><a class="ds2-5-text-link ds2-5-text-link--inline js-related-work-grid-card-view-pdf" href="https://www.academia.edu/83381913/In_situ_U_Pb_O_and_Hf_isotopic_compositions_of_zircon_and_olivine_from_Eoarchaean_rocks_West_Greenland_New_insights_to_making_old_crust"><span class="ds2-5-text-link__content">View PDF</span><span class="material-symbols-outlined" style="font-size: 18px" translate="no">chevron_right</span></a></div></div><div class="ds-related-work--container js-related-work-sidebar-card" data-collection-position="9" data-entity-id="12356200" 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/12356200/Internal_zoning_and_U_Th_Pb_chemistry_of_Jack_Hills_detrital_zircons_a_mineral_record_of_early_Archean_to_Mesoproterozoic_4348_1576Ma_magmatism">Internal zoning and U��Th��Pb chemistry of Jack Hills detrital zircons: a mineral record of early Archean to Mesoproterozoic (4348��1576Ma) magmatism</a><div class="ds-related-work--metadata"><a 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data-entity-id="54642246" 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/54642246/Early_Archean_crustal_evolution_of_the_Jack_Hills_Zircon_source_terrane_inferred_from_Lu_Hf_207Pb_206Pb_and_delta18O_systematics_of_Jack_Hills_zircons">Early Archean crustal evolution of the Jack Hills Zircon source terrane inferred from Lu-Hf, 207Pb/206Pb, and delta18O systematics of Jack Hills zircons</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="31659913" href="https://independent.academia.edu/MalcolmTMcCulloch">Malcolm T McCulloch</a></div><p class="ds-related-work--metadata ds2-5-body-xs">Geochim Cosmochim Acta, 2011</p><div class="ds-related-work--ctas"><button class="ds2-5-text-link ds2-5-text-link--inline js-swp-download-button" 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