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首页> 外文期刊>Contributions to Mineralogy and Petrology >Clumped-isotope palaeothermometry and LA-ICP-MS U-Pb dating of lava-pile hydrothermal calcite veins
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Clumped-isotope palaeothermometry and LA-ICP-MS U-Pb dating of lava-pile hydrothermal calcite veins

机译：Clumped-iSoTope Paleothermometry和La-ICP-MS U-PB熔岩桩水热方解石静脉的约会

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Calcite veins are a common product of hydrothermal fluid circulation. Clumped-isotope palaeothermometry is a promising technique for fingerprinting the temperature of hydrothermal fluids, but clumped-isotope systematics can be reset at temperatures of>ca. 100 degrees C. To model whether the reconstructed temperatures represent calcite precipitation or closed-system resetting, the precipitation age must be known. LA-ICP-MS U-Pb dating of calcite is a recently developed approach to direct dating of calcite and can provide precipitation ages for modelling clumped-isotope systematics in calcite veins. In this study, clumped-isotope and LA-ICP-MS U-Pb calcite analyses were combined in basalt-hosted calcite veins from three settings in Scotland. Samples from all three localities yielded precipitation temperatures of ca. 75-115 degrees C from clumped-isotope analysis, but veins from only two of the sites were dateable, yielding precipitation ages of 224 +/- 8Ma and 291 +/- 33Ma (2 sigma). Modelling from the dated samples enabled confident interpretation that no closed-system resetting had occurred in these samples. However, the lack of a precipitation age from the third location meant that a range of possible thermal histories had to be modelled meaning that confidence that resetting had not occurred was lower. This highlights the importance of coupling clumped-isotope thermometry and LA-ICP-MS U-Pb calcite dating in determining the temperature of hydrothermal fluids recorded in calcite veins. This paired approach is shown to be robust in constraining the timing and precipitation temperature of calcite formation, and thus for tracking hydrothermal processes.
机译：方解石静脉是水热流体循环的常见产物。 Clumped-IsoTope Paleothermometry是一种有希望的方法，用于指纹识别水热流体的温度，但可以在> Ca的温度下重置丛生同位素系统。 100摄氏度为模型是否是重建的温度代表方解石沉淀或闭合系统复位，必须知道降水时代。 La-ICP-MS U-PB Cariting的售价是最近开发的方解石约会的方法，可以提供用于在方解石静脉中建模Clumped-同位素系统的降水年龄。在本研究中，Clumped-Isotope和La-ICP-MS U-PB方解石分析在苏格兰的三种环境中组合在玄武岩托管的方解石静脉中。来自所有三个地方的样品产生了CA的沉淀温度。来自Clumped-IsoTope分析75-115摄氏度，但只有两个位点的静脉可调整，产生224 +/- 8mA和291 +/- 33mA（2 sigma）的沉淀。从日期样本中建模支持的自信地解释，这些样本中未发生闭合系统重置。然而，从第三位置缺乏降水年龄意味着必须建模一系列可能的热历史，这意味着数据没有发生重置的信心较低。这突出了偶联Clumped-同位素温度和La-ICP-MS U-PB Calcite的重要性在确定方解石静脉中记录的热热流体的温度。该配对的方法被证明是在约束方解石形成的定时和沉淀温度方面具有稳健的稳健，从而用于跟踪水热过程。

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