Hadean Zircon Petrochronology

1区 地球科学 Q1 Earth and Planetary Sciences
T. Harrison, E. Bell, P. Boehnke
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引用次数: 55

Abstract

The inspiration for this volume arose in part from a shift in perception among U–Pb geochronologists that began to develop in the late 1980s. Prior to then, analytical geochronology emphasized progressively lower blank analysis of separated accessory mineral aggregates (e.g., Krogh 1982; Parrish 1987), with results generally interpreted to reflect a singular moment in time. For example, a widespread measure of confidence in intra-analytical reliability was conformity to an MSWD (a form of χ2 test; Wendt and Carl 1991) of unity. This approach implicitly assumed that geological processes act on timescales that are short with respect to analytical errors (e.g., Schoene et al. 2015). As in situ methodologies (e.g., Compston and Pidgeon 1986; Harrison et al. 1997; Griffin et al. 2000) and increasingly well-calibrated double spikes (e.g., Amelin and Davis 2006; McLean et al. 2015) emerged, geochronologists began to move away from interpreting geological processes as a series of instantaneous episodes (e.g., Rubatto 2002). At about the same time, petrologists developed techniques that permitted in situ chemical analyses to be interpreted in terms of continuously changing pressure–temperature–time histories (e.g., Spear 1988). The recognition followed that specific mineral reactions yielded products that could be directly dated or interpreted in terms of protracted petrogenetic processes. Part of this shift was due to an appreciation that trace elements in accessory phases could identify the changing nature of modal mineralogy during crystal growth (e.g., Pyle et al. 2001; Kohn and Malloy 2004) and thus potentially relate petrogenesis to absolute time. The transition to petrochronology was complete upon recognition that high MSWDs were in fact the expected case for most metamorphic minerals (Kohn 2009). One of the great frontiers for fundamental discovery in the geosciences is earliest Earth (DePaolo et al. 2008). However, investigations of the first five …
这本书的灵感部分来自于20世纪80年代末开始发展的U-Pb地质年代学家的观念转变。在此之前,分析地质年代学逐渐强调分离的辅助矿物团聚体的较低空白分析(例如,Krogh 1982;Parrish 1987),其结果通常被解释为反映一个单一的时刻。例如,分析内信度的广泛置信度是符合MSWD (χ2检验的一种形式;温特和卡尔1991)的统一。这种方法隐含地假设地质过程在相对于分析误差而言较短的时间尺度上起作用(例如,Schoene et al. 2015)。就地方法(例如,Compston和Pidgeon 1986;Harrison et al. 1997;Griffin et al. 2000)和越来越精确的双尖峰(例如,Amelin and Davis 2006;McLean et al. 2015)的出现,地质年代学家开始不再将地质过程解释为一系列瞬时事件(例如,Rubatto 2002)。大约在同一时期,岩石学家开发了一种技术,可以根据连续变化的压力-温度-时间历史来解释现场化学分析(例如,Spear 1988)。随后认识到,特定的矿物反应产生的产物可以直接确定年代,或根据长期的岩石形成过程进行解释。这种转变的部分原因是人们认识到,辅助相中的微量元素可以识别晶体生长过程中模态矿物学性质的变化(例如,Pyle等人,2001;Kohn and Malloy 2004),因此可能将岩石成因与绝对时间联系起来。在认识到高mswd实际上是大多数变质矿物的预期情况后,向岩石年代学的过渡就完成了(Kohn 2009)。地球科学基础发现的伟大前沿之一是最早的地球(DePaolo et al. 2008)。然而,对前五名的调查……
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来源期刊
Reviews in Mineralogy & Geochemistry
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
39
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.
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