Rock Thin Section Scale In-Situ Apatite U-Pb Dating Technique Discussion: A New Perspective on Ultramafic Rock Geochronology Analysis
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摘要:
超基性岩作为地幔岩石的主要组分，其形成时代对理解地球内部结构和动力学过程具有重要意义。由于超基性岩浆硅元素不饱和，难以结晶出锆石，而作为超基性岩中常见的副矿物，磷灰石凭借其独特的晶体化学特征，成为超基性岩年代学研究的重要对象。随着原位微区分析技术的进步，磷灰石U-Pb定年技术得到了显著发展，定年的精度和可靠性显著提高。然而，在超基性岩薄片上进行原位磷灰石定年分析仍然需要解决一些棘手的问题，如普通铅的校正问题、矿物的成因分析以及岩石薄片制备过程中的污染控制等。笔者分析了超基性岩定年研究现状，综述了岩石原位定年技术和磷灰石U-Pb定年技术的研究进展，探讨了磷灰石U-Pb定年技术在超基性岩原位定年中的应用前景，并对未来研究方向进行了展望。
Abstract:Ultramafic rocks, as a major component of mantle rocks, hold significant importance for understanding the Earth's internal structure and dynamic processes. Due to the silicon undersaturation in ultramafic magmas, crystallization of zircon is challenging; instead, apatite, a common accessory mineral in ultramafic rocks, has emerged as a crucial target for geochronological studies owing to its unique crystallochemical characteristics. With advancements in in-situ microanalysis techniques, the U-Pb dating method for apatite has experienced marked improvements, significantly enhancing both precision and reliability. However, conducting in-situ apatite dating analyses on thin sections of ultramafic rocks still presents several challenges, such as the correction of common lead, genetic analysis of the minerals, and contamination control during the preparation of rock thin sections. This paper reviews the current state of geochronological research on ultramafic rocks, summarizes advancements in in-situ dating techniques and apatite U-Pb dating methodologies, discusses the prospects for the application of apatite U-Pb dating in the in-situ dating of ultramafic rocks, and outlines future research directions.
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Keywords:
- apatite /
- ultramafic rocks /
- in-situ U-Pb dating /
- thin section scale
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图 1 截至目前公开报道的磷灰石在全球的分布示意图
图中数字代表在该地报道过磷灰石数据的文献数量；由于缩放尺度所限，该区域可能包含多处矿床、地质体、自然保护区、陨石发现地等；数据来源：https://zh.mindat.org/min-29229.html
Figure 1. The global distribution of apatite as reported in publicly available literature to date
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