The abundance and isotopic composition of the noble gases in ancient fluids

Chemical Geology: Isotope Geoscience section Pub Date : 1992-06-10 DOI:10.1016/0009-2541(92)90207-L

F.M. Stuart, G. Turner

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引用次数: 60

Abstract

Analysis of noble gases released from fluid inclusions by stepwise in vacuo crushing promises to provide for palaeocrustal fluids the wealth of information currently being obtained from the analysis of noble gases in contemporary ground-waters. In this paper, we report preliminary analyses and interpretation of noble-gas abundances and isotopes in: (a) minerals that precipitated in equilibrium with the atmosphere, in order to identify trapped air-saturated water; (b) quartz and fluorite from the North Pennines orrefield, to provide evidence on the source and interactions of the mineralising fluids; (c) Rhynie chert and associated vein quartz, an example of Devonian hot-spring activity; and (d) fluid inclusion-bearing mantle minerals, with MORB-type RbSr and SmNd isotope systematics.

Not surprisingly, these measurements indicate that many of the features of modern fluids are seen in palaeo-fluids. An important practical problem appears to be the presence of an additional component of unfractionated atmosphere in some samples.

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古代流体中稀有气体的丰度和同位素组成

通过真空破碎逐步分析流体包裹体中释放的稀有气体，有望为古地壳流体提供目前从当代地下水中稀有气体分析中获得的丰富信息。在本文中，我们报告了对稀有气体丰度和同位素的初步分析和解释:(a)与大气平衡沉淀的矿物，以确定被困的空气饱和水;(b)北奔宁矿田的石英和萤石，为矿化流体的来源和相互作用提供证据;(c) Rhynie燧石和伴生脉石英，是泥盆纪温泉活动的一个例子;(d)含流体包裹体的地幔矿物，具有morb型RbSr和SmNd同位素系统。毫不奇怪，这些测量结果表明，现代流体的许多特征在古流体中也能看到。一个重要的实际问题似乎是在一些样品中存在额外的未分馏大气成分。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Chemical Geology: Isotope Geoscience section

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