Crystallization and Disturbance Histories of Single Zircon Crystals From Hadean‐Eoarchean Acasta Gneisses Examined by LA‐ICP‐MS U‐Pb Traverses

Guitreau Martin; Mora Nicolas; Paquette Jean‐Louis

摘要

Abstract >Zircon U‐Pb geochronology is a very robust dating method but the accuracy of determined ages can sometimes be compromised. This is because, as commonly observed, the U‐Pb isotope system can be reopened during the post‐crystallization evolution of a zircon. The present manuscript investigates the capability of traverses by LA‐ICP‐MS to identify zones of well‐preserved U‐Pb isotope systematics within zircon crystals. The data for the different zones can be used to construct internal Discordia lines that provide age information about crystallization and metamorphism of single zircon crystals. To test our approach, we analyzed zircons from three ca. 3.96 Ga Acasta gneisses. Results demonstrate that such a method allows retrieval of original crystallization age in most of the studied zircons, even in those that experienced ancient U‐Pb disturbances resulting in discordant U‐Pb data. It was also possible to estimate disturbance ages, though not as precisely as for the igneous crystallization, in many of the studied crystals. </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> >锆石U-PB地理学是一种非常强大的约会方法，但确定年龄的准确性有时会受到损害。这是因为，如同常见的是，在锆石的后结晶演化期间可以重新打开U-Pb同位素系统。目前的稿件调查了La-ICP-MS的遍历的能力，以识别锆石晶体中保存良好的U-Pb同位素系统的区域。不同地区的数据可用于构建内部不等的线条，其提供关于单锆晶体的结晶和变质的年龄信息。为了测试我们的方法，我们分析了三个CA的锆石。 3.96 Ga Acasta片状。结果表明，这种方法允许在大多数研究的锆石中检索原始结晶年龄，即使在经历过古老的U-PB干扰导致不可能的U-PB数据的那些中，也是如此。也可以估计扰动年龄，但在许多研究的晶体中不如代表性的结晶而恰当地均匀。</ 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1期</span><b style="margin: 0 2px;">|</b><span>共20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=Guitreau Martin&option=202" target="_blank" rel="nofollow">Guitreau Martin;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Mora Nicolas&option=202" target="_blank" rel="nofollow">Mora Nicolas;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Paquette Jean‐Louis&option=202" target="_blank" rel="nofollow">Paquette Jean‐Louis;</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>Université Clermont Auvergne CNRS IRD OPGC Laboratoire Magmas et VolcansClermont‐Ferrand France;</p> <p>Université Clermont Auvergne CNRS IRD OPGC Laboratoire Magmas et VolcansClermont‐Ferrand France;</p> <p>Université Clermont Auvergne CNRS IRD OPGC Laboratoire Magmas et VolcansClermont‐Ferrand France;</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=zircon&option=203" rel="nofollow">zircon;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=U‐Pb geochronology&option=203" rel="nofollow">U‐Pb geochronology;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=LA‐ICP‐MS&option=203" rel="nofollow">LA‐ICP‐MS;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Archean&option=203" rel="nofollow">Archean;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Acasta gneisses&option=203" rel="nofollow">Acasta gneisses;</a> </p> <div class="translation"> 机译：锆石;U-PB地理学学;La-ICP-MS;Archean;Acasta外精端; 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