激光烧蚀电感耦合等离子体质谱测定岩石年代学

1区地球科学 Q1 Earth and Planetary Sciences

Reviews in Mineralogy & Geochemistry Pub Date : 2017-02-01 DOI:10.2138/RMG.2017.83.6

A. Kylander‐Clark

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引用次数: 44

摘要

岩石年代学是地球科学的一个领域，其中矿物计时器的同位素和/或元素组成与它的年龄相结合，从而产生岩石学和年代学的更协同的组合，可以用来解释地质过程。最近，随着矿物分析技术的改进，它又引起了人们的兴趣。从早期采用锆石中的U / Th比率作为岩浆与火成岩结晶的指标(例如，Ahrens 1965)，到使用钛矿中的Nd同位素组成来跟踪来源随时间的贡献，这样的例子很多，而且还在不断增加。B. R. Hacker，《个人交际》。年龄和化学信息可以通过多种技术获得:电子探针(年龄;主要和次要元素;参见Williams et al. 2017)，二次离子质谱法(SIMS;年龄;微量元素;同位素比率;参见Schmitt and Vazquez 2017)，以及激光烧蚀电感耦合等离子体质谱法(LA-ICPMS;年龄;微量元素;同位素比率)。激光烧蚀ICPMS仪器和技术是本章的重点，几十年来一直被用作岩石年代学工具，从年龄和元素和/或同位素组成的单独分析开始，然后将其组合和解释。例如，Zheng等人(2009)利用LA-ICPMS分析了金伯利岩中锆石的微量元素(TE)化学、Hf同位素组成和年龄，方法是在每个锆石颗粒上使用三个点，每个点代表一种分析类型。由于需要进行大量的分析，这项工作比较耗时和昂贵，但由于物理条件(岩石学)和时间(年代学)之间的联系，对结论的信心要高得多。采用LA-ICPMS的仪器和技术不断改进，特别是在获得岩石年代学数据方面的便利性。一台LA-ICPMS仪器现在可以同时测量…

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Petrochronology by Laser-Ablation Inductively Coupled Plasma Mass Spectrometry

Petrochronology is a field of Earth science in which the isotopic and / or elemental composition of a mineral chronometer is interpreted in combination with its age, thus yielding a more synergistic combination of petrology and chronology that can be used to interpret geologic processes. It has recently attracted renewed interest as technologies for mineral analysis have improved. Examples are many, and continue to grow, from the early adoption of U / Th ratios in zircon as an indicator for magmatic vs. igneous crystallization (e.g., Ahrens 1965), to using the Nd isotopic composition in titanite to track source contribution over time (see Applications ; B. R. Hacker, personal communication). Age and chemical information can be obtained by a variety of techniques: electron microprobe (age; major and minor elements; see Williams et al. 2017), secondary ion mass spectrometry (SIMS; age; trace elements; isotopic ratios; see Schmitt and Vazquez 2017), and laser-ablation inductively coupled plasma mass spectrometry (LA-ICPMS; age; trace elements; isotopic ratios). Laser-ablation ICPMS instrumentation and techniques, the focus of this chapter, have been employed as a petrochronologic tool for decades, starting with separate analyses of ages and elemental and / or isotopic compositions, which were then combined and interpreted. For example, Zheng et al. (2009) employed LA-ICPMS to analyze the trace-element (TE) chemistry, Hf isotopic composition, and age of zircons from kimberlites by using three spots on each zircon grain, one for each type of analysis. This work was relatively time consuming and expensive, given the required number of analytical sessions, but yielded far better confidence in the conclusions, because of the link between physical conditions (petrology) and time (chronology). Instrumentation and techniques which employ LA-ICPMS have continued to improve, particularly in the ease with which petrochronologic data can be obtained. A single LA-ICPMS instrument can now measure both the …

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来源期刊

Reviews in Mineralogy & Geochemistry 地学-地球化学与地球物理

CiteScore

8.30

自引率

0.00%

发文量

期刊介绍： RiMG is a series of multi-authored, soft-bound volumes containing concise reviews of the literature and advances in theoretical and/or applied mineralogy, crystallography, petrology, and geochemistry. The content of each volume consists of fully developed text which can be used for self-study, research, or as a text-book for graduate-level courses. RiMG volumes are typically produced in conjunction with a short course but can also be published without a short course. The series is jointly published by the Mineralogical Society of America (MSA) and the Geochemical Society.