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Determining cooling rates from mica Ar-40/Ar-39 thermochronology data: Effect of cooling path shape

机译:确定MICA AR-40 / AR-39热量数据的冷却速率:冷却路径形状的影响

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摘要

Tectonic models are commonly underpinned by metamorphic cooling rates derived from diffusive-loss thermochronology data. Such cooling ages are usually linked to temperature via Dodson's closure temperature (T-C) formulation, which specifies a 1/time-shaped cooling path (Contributions to Mineralogy and Petrology, 1973, 40, 259). Geologists, however, commonly discuss cooling rates as a linear temperature/time shape. We present the results of a series of simple finite-difference diffusion models for Ar diffusion in muscovite and biotite that show that the difference in recorded age between 1/t and linear cooling paths increases significantly with hotter starting temperatures, slower cooling rates and smaller grain sizes. Our results show that it is essential to constrain the cooling path shape in order to make meaningful interpretations of the measured data.
机译:构造模型通常是通过从扩散损耗热量数据衍生的变质冷却速率基础。 这种冷却剂通常通过DoDson的闭合温度(T-C)制剂与温度相连,这指定了1/时状的冷却路径(对矿物学和岩石学的贡献,1973,40,259)。 然而,地质学家通常讨论冷却速率作为线性温度/时间形状。 我们介绍了Muscovite和Biotite中AR扩散的一系列简单有限差分扩散模型的结果,表明1 / T和线性冷却路径之间的记录年龄之间的差异显着增加,并且更热的起始温度,较慢的冷却速度和较小的晶粒 大小。 我们的结果表明,必须限制冷却路径形状,以便对测量数据进行有意义的解释。

著录项

  • 来源
    《Terra Nova》 |2019年第3期|共13页
  • 作者单位

    Open Univ Sch Environm Earth &

    Ecosyst Sci Walton Hall Milton Keynes Bucks England;

    Open Univ Sch Environm Earth &

    Ecosyst Sci Walton Hall Milton Keynes Bucks England;

    Dassault Syst Cambridge England;

    Curtin Univ Sch Earth &

    Planetary Sci Inst Geosci Res TIGeR Perth WA Australia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 天文学、地球科学;
  • 关键词

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