Uranium isotope evidence for an expansion of marine anoxia during the end‐        <fc >T</fc>T        riassic extinction

Jost Adam B.; Bachan Aviv; van de Schootbrugge Bas; Lau Kimberly V.; Weaver Karrie L.; Maher Kate; Payne Jonathan L.

摘要

Abstract > The end‐Triassic extinction coincided with an increase in marine black shale deposition and biomarkers for photic zone euxinia, suggesting that anoxia played a role in suppressing marine biodiversity. However, global changes in ocean anoxia are difficult to quantify using proxies for local anoxia. Uranium isotopes ( δ 238 U) in CaCO <sub>3</sub> sediments deposited under locally well‐oxygenated bottom waters can passively track seawater δ 238 U, which is sensitive to the global areal extent of seafloor anoxia due to preferential reduction of 238 U(VI) relative to 235 U(VI) in anoxic marine sediments. We measured δ 238 U in shallow‐marine limestones from two stratigraphic sections in the Lombardy Basin, northern Italy, spanning over 400 m. We observe a ～0.7‰ negative excursion in δ 238 U beginning in the lowermost Jurassic, coeval with the onset of the initial negative δ 13 C excursion and persisting for the duration of subsequent high δ 13 C values in the lower‐middle Hettangian stage. The δ 238 U excursion cannot be realistically explained by local mixing of uranium in primary marine carbonate and reduced authigenic uranium. Based on output from a forward model of the uranium cycle, the excursion is consistent with a 40–100‐fold increase in the extent of anoxic deposition occurring worldwide. Additionally, relatively constant uranium concentrations point toward increased uranium delivery to the oceans from continental weathering, which is consistent with weathering‐induced eutrophication following the rapid increase in p CO <sub>2</sub> during emplacement of the Central Atlantic Magmatic Province. The relative timing and duration of the excursion in δ 238 U implies that anoxia could have delayed biotic recovery well into the Hettangian stage. </abstract> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> <div class="translation abstracttxt"> <span class="zhankaihshouqi fivelineshidden" id="abstract"> <span>机译：</span><Abstract Type =“main”> <标题类型=“main”>抽象</ title> > 最终三叠纪的灭绝恰逢海洋黑色页岩沉积和光电区exinia的生物标志物增加，表明缺氧在抑制海洋生物多样性方面发挥了作用。然而，海洋缺氧的全球变化难以使用当地缺氧的代理量化。铀同位素（ δ</ i> 238 </ sup> u）在Caco <sub> 3 </ sub> 沉积在局部良好的氧化底部水下的沉积物可以被动地追踪海水 δ</ i> 238 </ sup> U，这对海底缺氧的全球范围敏感，由于优先减少 238 </ sup> U（vi）相对于 235 </ sup> U（vi）在缺氧海洋沉积物中。我们衡量 δ</ i> 238 </ sup> 来自伦巴第盆地的两个地层部分的浅海洋石灰岩，意大利北部跨越400米。我们观察到〜0.7‰负面偏移 δ</ i> 238 </ sup> u从最下面的侏罗纪开始，符合初始负面的起始 δ</ i> 13 </ sup> C次偏移并持续到随后的高位 δ</ i> 13 </ sup> 中升海滩舞台中的值。这 δ</ i> 238 </ sup> 通过铀在原发性海洋碳酸盐和减少的作用铀的局部混合不能实现U次游览。基于来自铀循环的前向模型的产出，偏移是一致的，在全球范围内发生的缺氧沉积程度增加40-100倍。此外，相对恒定的铀浓浓度指向从大陆风化的海洋中增加铀送，这与风化诱导的富营养化在快速增加之后一致 p </ i> CO. <sub> 2 </ sub> 在中央大西洋岩石省的施加期间。偏移的相对时间和持续时间 δ</ i> 238 </ sup> 你意味着缺氧可能会延迟生物恢复井进入海丁舞台。 </ p> </摘要> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> </div> <div class="record"> <h2 class="all_title" id="enpatent33" >著录项</h2> <ul> <li> <span class="lefttit">来源</span> <div style="width: 86%;vertical-align: text-top;display: inline-block;"> <a href='/journal-foreign-23285/'>《Geochemistry, geophysics, geosystems》</a> <b style="margin: 0 2px;">|</b><span>2017年第8期</span><b style="margin: 0 2px;">|</b><span>共16页</span> </div> </li> <li> <div class="author"> <span class="lefttit">作者</span> <p id="fAuthorthree" class="threelineshidden zhankaihshouqi"> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Jost Adam B.&option=202" target="_blank" rel="nofollow">Jost Adam B.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Bachan Aviv&option=202" target="_blank" rel="nofollow">Bachan Aviv;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=van de Schootbrugge Bas&option=202" target="_blank" rel="nofollow">van de Schootbrugge Bas;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Lau Kimberly V.&option=202" target="_blank" rel="nofollow">Lau Kimberly V.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Weaver Karrie L.&option=202" target="_blank" rel="nofollow">Weaver Karrie L.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Maher Kate&option=202" target="_blank" rel="nofollow">Maher Kate;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Payne Jonathan L.&option=202" target="_blank" rel="nofollow">Payne Jonathan L.;</a> </p> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zkzz" style="display: none;">展开▼</span> </div> </li> <li> <div style="display: flex;"> <span class="lefttit">作者单位</span> <div style="position: relative;margin-left: 3px;max-width: 639px;"> <div class="threelineshidden zhankaihshouqi" id="fOrgthree"> <p>Department of Geological SciencesStanford UniversityStanford California USA;</p> <p>Department of Geological SciencesStanford UniversityStanford California USA;</p> <p>Marine Palynology and Paleoceanography Group Department of Earth SciencesUtrecht UniversityUtrecht Netherlands;</p> <p>Department of Geological SciencesStanford UniversityStanford California USA;</p> <p>Department of Geological SciencesStanford UniversityStanford California USA;</p> <p>Department of Geological SciencesStanford UniversityStanford California USA;</p> <p>Department of Geological SciencesStanford UniversityStanford California USA;</p> </div> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zhdw" style="display: none;">展开▼</span> </div> </div> </li> <li > <span class="lefttit">收录信息</span> <span style="width: 86%;vertical-align: text-top;display: inline-block;"></span> </li> <li> <span class="lefttit">原文格式</span> <span>PDF</span> </li> <li> <span class="lefttit">正文语种</span> <span>eng</span> </li> <li> <span class="lefttit">中图分类</span> <span><a href="https://www.zhangqiaokeyan.com/clc/163.html" title="地球物理学">地球物理学;</a></span> </li> <li class="antistop"> <span class="lefttit">关键词</span> <p style="width: 86%;vertical-align: text-top;"> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Jurassic&option=203" rel="nofollow">Jurassic;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Hettangian&option=203" rel="nofollow">Hettangian;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=redox&option=203" rel="nofollow">redox;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=carbonates&option=203" rel="nofollow">carbonates;</a> </p> <div class="translation"> 机译：侏罗纪;海丁;氧化还原;碳酸盐; 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Uranium isotope evidence for an expansion of marine anoxia during the end‐ TT riassic extinction

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