Late Eocene Southern Ocean Cooling and Invigoration of Circulation Preconditioned Antarctica for Full‐Scale Glaciation

Houben Alexander J. P.; Bijl Peter K.; Sluijs Appy; Schouten Stefan; Brinkhuis Henk

摘要

Abstract > During the Eocene‐Oligocene Transition (EOT; 34–33.5?Ma), Antarctic ice sheets relatively rapidly expanded, leading to the first continent‐scale glaciation of the Cenozoic. Declining atmospheric CO <sub>2</sub> concentrations and associated feedbacks have been invoked as underlying mechanisms, but the role of the quasi‐coeval opening of Southern Ocean gateways (Tasman Gateway and Drake Passage) and resulting changes in ocean circulation is as yet poorly understood. Definitive field evidence from EOT sedimentary successions from the Antarctic margin and the Southern Ocean is lacking, also because the few available sequences are often incomplete and poorly dated, hampering detailed paleoceanographic and paleoclimatic analysis. Here we use organic dinoflagellate cysts (dinocysts) to date and correlate critical Southern Ocean EOT successions. We demonstrate that widespread winnowed glauconite‐rich lithological units were deposited ubiquitously and simultaneously in relatively shallow‐marine environments at various Southern Ocean localities, starting in the late Eocene (~35.7?Ma). Based on organic biomarker paleothermometry and quantitative dinocyst distribution patterns, we analyze Southern Ocean paleoceanographic change across the EOT. We obtain strong indications for invigorated surface and bottom water circulation at sites affected by polar westward‐flowing wind‐driven currents, including a westward‐flowing Antarctic Countercurrent, starting at about 35.7?Ma. The mechanism for this oceanographic invigoration remains poorly understood. The circum‐Antarctic expression of the phenomenon suggests that, rather than triggered by tectonic deepening of the Tasman Gateway, progressive pre‐EOT atmospheric cooling played an important role. At localities affected by the Antarctic Countercurrent, sea surface productivity increased and simultaneously circum‐Antarctic surface waters cooled. We surmise that combined, these processes contributed to preconditioning the Antarctic continent for glaciation. </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”XML：Lang =“en”> <标题类型=“main”>抽象</ title> > 在何奥酮转化（EOT; 34-33.5？MA）期间，南极冰盖相对迅速扩张，导致新生代的第一个巨大冰川冰川。衰退的大气co. <sub> 2 </ sub> 浓度和相关反馈已被调用为底层机制，但南洋网关（塔斯曼门户和德雷克通道）的准辅人开口的作用和导致海洋循环的变化也明显不佳。来自南极边缘和南海的EOT沉积演替的最终现场证据缺乏，因为少数可用序列通常不完全且日期不完全，但妨碍了详细的古生食品和古模激性分析。在这里，我们使用有机Dinoflagellate囊肿（DinoCysts）迄今为止，关键的南洋EOT演替。我们证明，广泛的富含葡萄糖岩石的岩性单位在各种南洋地区的相对浅海环境中普遍存在，同时沉积在不同的南海地区，从晚期（〜35.7？MA）开始。基于有机生物标志物苍白温度测量和定量的Dinyyst分布模式，我们分析了EOT的南海古食物变化。我们在受极地向下流动的风力驱动电流影响的部位获得强烈的表面和底部水循环的强烈指示，包括向西流动的南极逆流，从大约35.7 mA开始。这种海洋敏感度的机制仍然明白。这种现象的南极表达表明，而不是由塔斯曼网关的构造加深引发，逐步预埃托特大气冷却起到了重要作用。在受南极逆流影响的地方，海面生产率增加，同时循环南极表面水冷却。我们猜测，这些过程有助于预处理南极大陆进行冰川。 </ 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>2019年第5期</span><b style="margin: 0 2px;">|</b><span>共21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=Houben Alexander J. P.&option=202" target="_blank" rel="nofollow">Houben Alexander J. P.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Bijl Peter K.&option=202" target="_blank" rel="nofollow">Bijl Peter K.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Sluijs Appy&option=202" target="_blank" rel="nofollow">Sluijs Appy;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Schouten Stefan&option=202" target="_blank" rel="nofollow">Schouten Stefan;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Brinkhuis Henk&option=202" target="_blank" rel="nofollow">Brinkhuis Henk;</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>Marine Palynology and Paleoceanography Laboratory of Palaeobotany and Palynology Department of Earth Sciences Faculty of GeosciencesUtrecht UniversityUtrecht The Netherlands;</p> <p>Marine Palynology and Paleoceanography Laboratory of Palaeobotany and Palynology Department of Earth Sciences Faculty of GeosciencesUtrecht UniversityUtrecht The Netherlands;</p> <p>Marine Palynology and Paleoceanography Laboratory of Palaeobotany and Palynology Department of Earth Sciences Faculty of GeosciencesUtrecht UniversityUtrecht The Netherlands;</p> <p>Royal Netherlands Institute for sea research (NIOZ) and Utrecht UniversityTexel The Netherlands;</p> <p>Marine Palynology and Paleoceanography Laboratory of Palaeobotany and Palynology Department of Earth Sciences Faculty of GeosciencesUtrecht UniversityUtrecht The Netherlands;</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=Eocene‐Oligocene transition&option=203" rel="nofollow">Eocene‐Oligocene transition;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=ocean circulation&option=203" rel="nofollow">ocean circulation;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Southern Ocean&option=203" rel="nofollow">Southern Ocean;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Antarctica&option=203" rel="nofollow">Antarctica;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=dinoflagellate cysts&option=203" rel="nofollow">dinoflagellate cysts;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=paleothermometry&option=203" rel="nofollow">paleothermometry;</a> </p> <div class="translation"> 机译：oocene-oligocene转型;海洋循环;南海;南极洲;丁氏菌囊肿;苍白; </div> </li> </ul> </div> </div> <div class="literature cardcommon"> <div class="similarity "> <h3 class="all_title" id="enpatent66">相似文献</h3> <div class="similaritytab clearfix"> <ul> <li class="active" >外文文献</li> <li >中文文献</li> <li >专利</li> </ul> </div> <div class="similarity_details"> <ul > <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/journal-foreign-detail/0704023360586.html">Late Eocene Southern Ocean Cooling and Invigoration of Circulation Preconditioned Antarctica for Full‐Scale Glaciation</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Houben Alexander J. 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