Optimization of a Laser Ablation‐Single Collector‐Inductively Coupled Plasma‐Mass Spectrometer (Thermo Element 2) for Accurate, Precise, and Efficient Zircon U‐Th‐Pb Geochronology

Pullen Alex; Ibá?ez‐Mejia Mauricio; Gehrels George E.; Giesler Dominique; Pecha Mark

摘要

Abstract > Many applications specific to detrital mineral U‐Th‐Pb geochronology in the Earth sciences necessitate large numbers of age observations to be made from samples and require accurate and precise isotope measurements across wide dynamic ranges in elemental concentrations and signal intensities. This implies that the laser system and mass spectrometer cannot be tuned between individual analyses as to optimize measurements based on the isotope composition and concentrations of samples and that intensity matching between the unknowns to be dated and the reference material(s) used for fractionation correction is impossible to ensure. We describe methodologies for optimization of laser ablation‐single collector‐inductively coupled plasma‐mass spectrometer for the accurate determination of initial‐Pb‐corrected (using measured 204 Pb) U‐Th‐Pb zircon ages, taking full advantage of the high sensitivity provided by the Thermo Element 2 ICP‐MS instruments fitted with a high‐performance low ultimate vacuum Jet interface. “We describe an approach that corrects for nonlinearity of the detector—the primary obstacle avoided with sample‐specific tuning—as well as element‐ and mass‐dependent fractionation and instrumental drift by using a suite of three zircon reference materials with known isotopic ratios from isotope dilution‐thermal ionization mass spectrometry measurements but with differing U and Pb concentrations.” This approach allows for (experimentally) determining an instrumental fractionation versus ion beam intensity curve used for standard‐sample bracketing, thus taking into consideration an important instrumental variable that is commonly ignored in most applications of U‐Pb dating using laser ablation‐single collector‐inductively coupled plasma‐mass spectrometer. We show that these methodologies yield uncertainties and age offsets typically better than ±2.0% for individual measurements of small (e.g., 10‐μm depth?×?20‐μm diameter) volumes of material. </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> > 地球科学中特异性特异性特异性的应用，需要从样品中进行大量的年龄观察，并且需要在元素浓度和信号强度的宽动态范围内进行准确和精确的同位素测量。这意味着激光系统和质谱仪不能是调谐</ i> 在个体分析之间，以优化基于同位素组成和样品浓度的测量，并且不可知的未知数与用于分馏校正的参考材料之间的强度匹配是不可能确保的。我们描述了用于优化激光烧蚀 - 单收集器电感耦合等离子体质谱仪的方法，以便精确确定初始PB校正（使用测量 204 </ sup> PB）U-TH-PB锆石年龄，充分利用热电元件2 ICP-MS仪器提供的高灵敏度，适用于高性能低终极真空喷射界面。 “我们描述了一种纠正探测器非线性的方法 - 通过使用具有已知同位素比例的三种锆石参考材料来避免使用特定于样品的调谐和仪器和仪器漂移的主要障碍物。同位素稀释 - 热电离质谱测量，但具有不同的U和Pb浓度。“这种方法允许（通过实验）确定用于标准样本包围的离子束强度曲线的仪器分馏与离子束强度曲线，从而考虑了使用激光消融 - 单个收集器的U-Pb的大多数应用中通常忽略的重要乐器变量 - 电感耦合等离子体质谱仪。我们表明，这些方法产生了通常比±2.0％更优于±2.0％的不确定性和年龄抵消，所述单个测量的小（例如，10μm深度Δ×20-μm直径）材料。 </ 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10期</span><b style="margin: 0 2px;">|</b><span>共17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=Pullen Alex&option=202" target="_blank" rel="nofollow">Pullen Alex;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Ibá?ez‐Mejia Mauricio&option=202" target="_blank" rel="nofollow">Ibá?ez‐Mejia Mauricio;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Gehrels George E.&option=202" target="_blank" rel="nofollow">Gehrels George E.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Giesler Dominique&option=202" target="_blank" rel="nofollow">Giesler Dominique;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Pecha Mark&option=202" target="_blank" rel="nofollow">Pecha Mark;</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 Environmental Engineering and Earth SciencesClemson UniversityClemson SC USA;</p> <p>Department of Earth and Environmental SciencesUniversity of RochesterRochester NY USA;</p> <p>Department of GeosciencesThe University of ArizonaTucson AZ USA;</p> <p>Department of GeosciencesThe University of ArizonaTucson AZ USA;</p> <p>Department of GeosciencesThe University of ArizonaTucson AZ 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=laser ablation&option=203" rel="nofollow">laser ablation;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=single collector ICP‐MS&option=203" rel="nofollow">single collector ICP‐MS;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=U‐Pb zircon dating&option=203" rel="nofollow">U‐Pb zircon dating;</a> </p> <div class="translation"> 机译：激光烧蚀;单个收集器ICP-MS;U-PB ZIRCON约会; 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