Petrology and Geochronology of Metamorphic Zircon
Petrology and Geochronology of Metamorphic Zircon
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DOI：
10.1002/9781119227250.ch2
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发表时间：
2017-12
期刊：
影响因子：
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通讯作者：
M. Kohn;N. Kelly
中科院分区：
文献类型：
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作者：
M. Kohn;N. Kelly
锆石也许是最常见的矿物，以限制变质过程。事实上，对于本综述，文献检索关键词“metamorphic zirconicon”检索到超过5000篇同行评审文章。虽然这些贡献中的大多数只是锆石分离或过度生长的日期，以提供广泛的变质作用的年龄限制，越来越多的文献侧重于使用锆石化学和包体组合，以联系在原地年龄与变质P-T条件。因此，锆石年龄的研究已经从块状锆石的分析转移到使用原位技术的微米尺度域的微观分析。我们将这篇评论分为五个不同细节的部分。首先，我们研究如何变质锆石形成。由于锆稳定锆石，我们特别考虑锆质量平衡和过程，可能重新分配锆在岩石中。第二，我们检验了P-T条件如何与锆石年龄相联系，强调了亚晶粒尺度上的包裹体组合和锆石化学。这一主题，一般被称为“岩石年代学”或岩石学和地质年代学的婚姻，代表了当今发展最快的研究领域，是至关重要的未来调查变质锆石。第三，我们简要介绍了分析策略和推断P-T条件的方法之间的联系。第四，我们考虑了来自不同变质环境的一些关键例子，包括超压（UHP），超温（UHT）和“湿”环境。最后，我们建议未来的研究方向。虽然几十年来的研究已经使变质锆石的岩石学和年代学
Zircon is perhaps the most commonly dated mineral to constrain metamorphic processes. Indeed, for this review, a literature search on the keywords “metamorphic zir con” retrieved over 5000 peer‐reviewed articles. Although most of these contributions simply date zircon separates or overgrowths to provide broad constraints on the age of metamorphism, an increasing literature focuses on using zircon chemistry and inclusion assemblages to link in situ ages with metamorphic P‐T conditions. Thus, investigation of zircon ages has shifted from analysis of bulk zircon to the microanalysis of micron‐scale domains using in situ techniques. We have divided this review into five sections of varying detail. First, we examine how metamorphic zircon forms. Because Zr stabilizes zircon, we especially consider Zr mass balance and processes that may redistribute Zr within a rock. Second, we exam ine how P‐T conditions may be linked to zircon ages, emphasizing inclusion assemblages and zircon chemistry at the sub‐grain scale. This topic, generically referred to as “petrochronology” or the marriage of petrology and geochronology, represents the fastest growing area of research today and is crucial to future investigations of metamorphic zircon. Third, we briefly cover the links between analytical strategies and methods of inferring P‐T conditions. Fourth, we consider some key examples from diverse metamorphic terranes, including ultrahigh‐ pressure (UHP), ultrahigh‐temperature (UHT), and “wet” environments. Last, we recommend future directions of study. While decades of research have Petrology and Geochronology of Metamorphic Zircon