Radiogenic Sr and Stable C and O Isotopes Across Precambrian‐Cambrian Transition in Marine Carbonatic Phosphorites of Malyi Karatau (Kazakhstan)—Implications for Paleo‐environmental Change

Stammeier J. A.; Hippler D.; Nebel O.; Leis A.; Grengg C.; Mittermayr F.; Kasemann S. A.; Dietzel M.

摘要

Abstract > The Precambrian‐Cambrian (P?‐?) transition is a unique period in Earth's history known for the “Cambrian Explosion.” Here we present a continuous radiogenic and stable isotope ( 87 Sr/ 86 Sr, δ 13 C <sub>VPDB, carb</sub> , and δ 18 O <sub>VPDB, carb</sub> ) and elemental (including rare earth elements) record across the P?‐? transition, preserved in phosphatic and carbonate shallow‐water deposits from two sections (Koksu and Kyrshabakty) in Kazakhstan. Microstructure, trace, and rare earth elements concentrations reflect near‐primary preservation. δ 13 C <sub>VPDB, carb</sub> data (?12.1‰ to 3.3‰) record formation conditions at a time of severe geodynamic changes. Negative δ 13 C <sub>VPDB, carb</sub> at the P?‐? boundary resemble the Basal Cambrian Carbon Anomaly. Average δ 18 O <sub>VPDB, carb</sub> values of ?11.7?±?3.8‰ are suggested to represent near‐primary signals and can be explained by isotopically lighter past sea water and elevated temperature during precipitation compared to present‐day conditions. Initial 87 Sr/ 86 Sr of the carbonate and phosphate fraction are in the range of 0.7086–0.7112 at the Koksu section and 0.7082–0.7136 at the Kyrshabakty section. This is in general agreement with the seawater 87 Sr/ 86 Sr evolution during the Early Cambrian. In this study, we present a refined 87 Sr/ 86 Sr seawater evolution, highlighting an extreme positive Sr isotope excursion at the P?‐? transition, which is suggested to be indicative for enhanced continental weathering and an increase in nutrient runoff into shallow ocean waters. This extreme geodynamic event may have served as a driving force for enhanced biologic activity in the lead up to the Cambrian Explosion, where phosphatic shallow‐water deposits from Kazakhstan constitute a valuable paleo‐environmental archive. </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> > PrecaMbrian-Cambrian（P？ - ？）过渡是地球历史上的独特时期，已知为“寒武纪爆炸”。在这里，我们提出了连续的辐射和稳定的同位素（ 87 </ sup> SR / 86 </ sup> SR，δ. 13 </ sup> C <sub> vpdb，carb </ sub> 和δ. 18 </ sup> O. <sub> vpdb，carb </ sub> ）和元素（包括稀土元素）在P？ - ？从哈萨克斯坦的两段（Koksu和Kyrshabakty）中保留的磷酸盐和碳酸盐浅水沉积中的过渡。微观结构，痕迹和稀土元素浓度反映了近初级保存。 δ. 13 </ sup> C <sub> vpdb，carb </ sub> 数据（？12.1‰至3.3‰）记录严重地球动力学变化时的形成条件。负δ. 13 </ sup> C <sub> vpdb，carb </ sub> 在p？ - ？边界类似于基础寒册碳异常。平均δ. 18 </ sup> O. <sub> vpdb，carb </ sub> 建议表示11.7？±3.8‰以表示接近初级信号，并且与当前条件相比，通过同位素较轻的海水和沉淀期间的温度升高。最初的 87 </ sup> SR / 86 </ sup> 碳酸盐和磷酸盐馏分的Sr在Koksu部分的0.7086-0.7112的范围内，在Kyrshabakty部分的0.7082-0.7136。这是与海水一般的协议 87 </ sup> SR / 86 </ sup> 早期寒武纪的SR演变。在这项研究中，我们提出了一种精致的 87 </ sup> SR / 86 </ sup> SR海水进化，突出了P？ - ？过渡，建议指示加强欧陆风化，增加营养径流进入浅海水。这种极端的地球动力学事件可能已经曾担任过寒武纪爆炸中增强生物活动的驱动力，其中来自哈萨克斯坦的磷酸浅水沉积物构成了一个有价值的古环境档案。 </ 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1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=Stammeier J. A.&option=202" target="_blank" rel="nofollow">Stammeier J. A.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Hippler D.&option=202" target="_blank" rel="nofollow">Hippler D.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Nebel O.&option=202" target="_blank" rel="nofollow">Nebel O.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Leis A.&option=202" target="_blank" rel="nofollow">Leis A.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Grengg C.&option=202" target="_blank" rel="nofollow">Grengg C.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Mittermayr F.&option=202" target="_blank" rel="nofollow">Mittermayr F.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Kasemann S. A.&option=202" target="_blank" rel="nofollow">Kasemann S. A.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Dietzel M.&option=202" target="_blank" rel="nofollow">Dietzel M.;</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>Institute of Applied GeosciencesGraz University of TechnologyGraz Austria;</p> <p>Institute of Applied GeosciencesGraz University of TechnologyGraz Austria;</p> <p>School of Earth Atmosphere and EnvironmentMonash UniversityClayton Victoria Australia;</p> <p>JR‐AquaConSol GmbHJoanneum ResearchGraz Austria;</p> <p>Institute of Applied GeosciencesGraz University of TechnologyGraz Austria;</p> <p>Institute of Technology and Testing of Building MaterialsGraz University of TechnologyGraz Austria;</p> <p>MARUM–Center for Marine Environmental Sciences and Faculty of GeosciencesUniversity of BremenBremen Germany;</p> <p>Institute of Applied GeosciencesGraz University of TechnologyGraz Austria;</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=Precambrian‐Cambrian transition&option=203" rel="nofollow">Precambrian‐Cambrian transition;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=87 Sr/ 86 Sr seawater evolution&option=203" rel="nofollow">87 Sr/ 86 Sr seawater evolution;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Cambrian Explosion&option=203" rel="nofollow">Cambrian Explosion;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=phosphorite deposits&option=203" rel="nofollow">phosphorite deposits;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=stable C and O isotopes&option=203" rel="nofollow">stable C and O isotopes;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Kazakhstan&option=203" rel="nofollow">Kazakhstan;</a> </p> <div class="translation"> 机译：Precambrian-Cambrian过渡;87 SR / 86 SR海水进化;寒武纪爆炸;磷酸盐矿床;稳定的C和O同位素;哈萨克斯坦; </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> </ul> </div> <div class="similarity_details"> <ul > <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/journal-foreign-detail/0704023360601.html">Radiogenic Sr and Stable C and O Isotopes Across Precambrian‐Cambrian Transition in Marine Carbonatic Phosphorites of Malyi Karatau (Kazakhstan)—Implications for Paleo‐environmental Change</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Stammeier J. 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