Deciphering a 2 Gyr‐Long Thermal History From a Multichronometer (U‐Th)/He Study of the Phalaborwa Carbonatite, Kaapvaal Craton, South Africa

Baughman Jaclyn S.; Flowers Rebecca M.

摘要

Abstract >(U‐Th)/He data were obtained for four minerals (baddeleyite‐BHe, titanite‐THe, zircon‐ZHe, apatite‐AHe) from the 2.06 Ga Phalaborwa carbonatite complex and nearby Archean basement of the Kaapvaal craton, South Africa. Our goals are to evaluate the relative He temperature sensitivities of these phases, better understand how radiation damage and other factors affect them, and inform aspects of the craton's thermal history. BHe dates overlap with Phalaborwa emplacement and record the highest temperatures of the dated phases. THe dates are 700–1,100 Ma and display a limited negative date‐eU correlation. ZHe dates are negatively correlated with eU, are younger (561–32 Ma) and have higher eU than the THe data, with the highest‐eU grains younger than the AHe dates. AHe dates are reproducible with a mean of 107?±?7 Ma. The THe and ZHe data show radiation damage reduction of their He retentivities manifested as the negative date‐eU correlations. Alpha dose estimates for zircon are several orders of magnitude higher than for titanite, consistent with the ZHe dates recording lower temperatures and a younger portion of the history than the THe dates. Thermal history modeling yields time‐temperature paths that (1) explain the AHe, ZHe, and THe data while honoring existing geologic constraints, thus demonstrating the internal consistency of the data set, (2) imply possible reheating during Namaqua‐Natal orogenesis, and (3) limit maximum probable temperatures to ～180°C during 300–183 Ma Karoo basin burial. The results show that exploiting multiple (U‐Th)/He thermochronometers and radiation damage effects can provide new insights into long‐term craton evolution. </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> >（u-th）/ he数据是从2.06帕尔比尔沃碳酸盐岩综合体和南方Kaapvaal Craton附近的第406米氏菌碳酸盐岩综合体和附近的第四次矿物质（Baddeleyite-bhe，锆石，磷灰石-Ahe）。非洲。我们的目标是评估这些阶段的相对敏感性，更好地了解辐射损坏和其他因素如何影响它们，并告知Craton热历史的方面。 BHE日期与Phalaborwa的涂布物重叠并记录日期阶段的最高温度。日期为700-1,100 mA，显示有限的负日期相关性。哲日期与欧盟呈负相关，尤为少（561-32 mA），欧盟比数据更高，欧盟最高谷物比AHE日期更年轻。 AHE日期可再现，平均值为107？±7 mA。和Zhe数据显示其避免损害的避免表现为负日期 - 欧盟相关性。锆石的alpha剂量估计比二岩石高的数量级，与Zhe日期符合较低的温度和历史的年轻部分比日期为一致。热历史建模产量（1）解释AHE，Zhe和数据，同时尊重现有地质约束，从而证明了数据集的内部一致性，（2）暗示在Namaqua-Natal Orogenesis期间可能再加热，并且（3）在300-183 mA卡卢盆地埋设期间将最大可能的温度限制为〜180°C。结果表明，利用多重（U-TH）/ HE热量计和辐射损伤效应可以为长期CRATON演变提供新的见解。</ 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>2018年第5期</span><b style="margin: 0 2px;">|</b><span>共14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=Baughman Jaclyn S.&option=202" target="_blank" rel="nofollow">Baughman Jaclyn S.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Flowers Rebecca M.&option=202" target="_blank" rel="nofollow">Flowers Rebecca 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>Department of Geological SciencesUniversity of ColoradoBoulder CO USA;</p> <p>Department of Geological SciencesUniversity of ColoradoBoulder CO 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=(U‐Th)/He&option=203" rel="nofollow">(U‐Th)/He;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=thermochronology&option=203" rel="nofollow">thermochronology;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Kaapvaal craton&option=203" rel="nofollow">Kaapvaal craton;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Phalaborwa carbonatite&option=203" rel="nofollow">Phalaborwa carbonatite;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=craton evolution&option=203" rel="nofollow">craton evolution;</a> </p> <div class="translation"> 机译：（U-TH）/他;Thermochronology;Kaapvaal Craton;帕尔拉博尔沃碳酸盐岩;Craton Evolution; 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