Paragenesis of secondary Ca–Al silicates during hydrothermal alteration of Proterozoic granitic rocks (SE Sweden),Geological Journal

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Paragenesis of secondary Ca–Al silicates during hydrothermal alteration of Proterozoic granitic rocks (SE Sweden)
Geological Journal ( IF 1.4 ) Pub Date : 2020-11-25 , DOI: 10.1002/gj.4044
Howri Mansurbeg _{1,

2} , Mohammad A. K. El‐Ghali ₃ , Salahedin Shahrokhi ₄ , Jaroslav Reif ₄ , Hossein S. Hussein ₅ , Sadoon Morad ₆

Affiliation

The texture and chemical compositions of secondary Ca–Al silicates (prehnite, pumpellyite, epidote, and titanite) and of related minerals (chlorite, sericite, K‐feldspar, albite, Fe‐oxides, fluorite, and calcite) are used to discuss their formation conditions during interaction of Proterozoic granitic rocks from SE Sweden with hydrothermal fluids. The paragenetic sequence of the Ca–Al silicates is suggested to have been accomplished at ca. 200–350°C and was controlled by small‐scale variations in the chemistry of the hydrothermal fluids, such as a_Ca²⁺/a_H⁺ ratio and f_O2 and f_CO2. These variations in fluid chemistry occurred mostly in closed systems, which involved the redistribution of elements released from the alteration of the magmatic minerals, primarily plagioclase, biotite, and amphibole and inducing porosity modifications. Accordingly, results obtained in this study should have implications for the role of hydrothermal alterations on element redistribution in the continental crust and for suitability of granitic rocks as repositories for radioactive wastes.

中文翻译：

元古代花岗岩水热蚀变过程中次生钙铝硅酸盐的共生作用（瑞典瑞典）

次生Ca-Al硅酸盐（葡萄石，水手榴石，埃迪奥德和钛铁矿）和相关矿物（绿泥石，绢云母，钾长石，钠长石，Fe-氧化物，萤石和方解石）的质地和化学组成瑞典东南元古生代花岗岩与热液的相互作用过程中的形成条件。Ca-Al硅酸盐的共生序列建议在大约30℃时完成。200–350°C，并且受水热流体化学性质的小范围变化（例如_Ca²⁺ / a _H⁺比率以及f _O2和f _CO2）控制。流体化学的这些变化主要发生在封闭的系统中，涉及从岩浆矿物的变化释放的元素的重新分布，主要是斜长石，黑云母和闪石以及诱导孔隙度的变化。因此，在这项研究中获得的结果应该对热液蚀变对大陆壳中元素重新分布的作用以及花岗岩岩作为放射性废物处置库的适用性具有影响。

更新日期：2020-11-25

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