Origins of calcite in a boiling geothermal system
Origins of calcite in a boiling geothermal system
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DOI：
10.2475/ajs.294.3.361
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发表时间：
1994-03
影响因子：
2.9
通讯作者：
S. Simmons;B. Christenson
中科院分区：
文献类型：
--
作者：
S. Simmons;B. Christenson
本文论述了新西兰活跃地热系统中热液方解石的成因，以建立其形成的空间水文和物理化学控制。这项研究的重点是方解石的形成在上2公里的Broadlands-Ohaaki地热系统，方解石是广泛的，影响流体成分的水文过程是已知的。本文所描述的两个例子是方解石取代钙铝硅酸盐矿物和方解石沉积在开放空间由于沸腾。流体包裹体和同位素（[delta][sup 18]O和[delta][sup 13]C）数据用于建立方解石饱和流体的温度、成分和起源。结果表明，方解石的产状、分布和稳定同位素反映了二氧化碳在沸腾地热系统中的浓度和运动。参考文献78篇，图18，4个标签。
This paper deals with the origins of hydrothermal calcite in active geothermal systems in New Zealand to establish the spatial hydrologic and physico-chemical controls on its formation. The study focusses on calcite formation in the upper 2 km of the Broadlands-Ohaaki geothermal system where calcite is widespread and the hydrologic processes affecting fluid compositions are known. The two examples described in this paper are calcite replacement of calcium alumino-silicate minerals and calcite deposition in open spaces due to boiling. Fluid inclusion and isotopic ([delta][sup 18]O and [delta][sup 13]C) data were used to establish to temperature, composition, and origin of calcite-saturated fluids. The results indicate that the occurrence, distribution, and stable isotopes of calcite reflect the concentration and movement of carbon dioxide through a boiling geothermal system. 78 refs., 18 figs., 4 tabs.