The generation of prograde P – T – t points and paths ; a textural , compositional , and chronological study of metamorphic monazite
The generation of prograde P – T – t points and paths ; a textural , compositional , and chronological study of metamorphic monazite
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发表时间：
2004
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通讯作者：
G. Fostera;R. R. Parrishb-R.;M. Horstwoodc;S. Cheneryd;J. Pylee;H. D. Gibsonf
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作者：
G. Fostera;R. R. Parrishb-R.;M. Horstwoodc;S. Cheneryd;J. Pylee;H. D. Gibsonf
地质模型和计算模型主要提供了我们目前对岩石变质作用和造山作用机制的理解，然而，由于难以将岩石的岩石年龄信息与岩石的压力-温度（P-T）演化联系起来，这些模型在很大程度上仍然未经检验。在这里，我们描述了一种方法，允许多个超压-温度-时间（P-T-T）点上产生的单个样品提供了一种手段来构建详细的P-T-T循环，使变质事件的持续时间，埋藏的时间和加热速率所经历的个别样品被确定。我们使用这种组合方法来产生多个P-T- t点的三个样品从喜马拉雅山脉和加拿大科迪勒拉和第一次显示，变质事件的持续时间是相似的，在每个地区和P-T-t加热速率变化从2.4F1.2.8C/Ma到5.0F2.0.8C/Ma。这种方式产生的P-T-t路径与所研究地区的地质历史吻合得很好，并允许对造山作用机制施加额外的约束。D 2004 Elsevier B. V.保留所有权利。
Analogue and computational models principally provide our present understanding of the mechanisms of prograde metamorphism and orogenesis, yet, due to the difficulty of linking prograde age information with the pressure–temperature (P–T) evolution of a rock, these models for the most part remain untested. Here, we describe an approach that allows multiple prograde pressure–temperature–time (P–T–t) points to be generated on single samples providing a means to construct detailed P–T–t loops, enabling the duration of metamorphic events, the timing of burial and the rate of heating experienced by individual samples to be determined. We use this combination approach to generate multiple prograde P–T– t points for three samples from the Himalayan and Canadian Cordillera and show for the first time that the duration of the metamorphic events are similar in each area and prograde heating rates vary from 2.4F1.2 8C/Ma to 5.0F2.0 8C/Ma. The P–T–t paths generated this way agree well with the established geological history of the studied areas and allow additional constraints to be placed on the mechanisms of orogenesis. D 2004 Elsevier B.V. All rights reserved.