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引言从晚石炭世到早二迭世末期出现了与欧洲海西期山脉浅色花岗岩有关的强烈热液活动。这一活动形成了许多有潜在工业意义的矿床,尤其是铀矿床和钨-锡矿床。对十几个铀矿产地进行的研究表明,在铀矿脉和浸染矿石的外围或内部存在着许多蚀变矿物。详细研究矿脉中的蚀变产物和自生矿物可以就主岩的一般地球化学演化特点、花岗岩矿物和流体之间的平衡反应类型以及成矿溶液特征等问题提供某些答案。一、分析技术使用光学显微镜、X射线衍射和电子探针分析研究了蚀变矿物,而蚀变矿物形成的温度压力条件是通过脉石矿物的流体包裹体研究测定的。对粘土的光学测定和研究给予特别的关
INTRODUCTION The intense hydrothermal activity associated with the light-haired granite in the Hercynian range of Europe occurred from Late Carboniferous to late Early Permian. This activity has resulted in many potentially industrial deposits, especially uranium deposits and tungsten-tin deposits. Research on more than a dozen uranium deposits has shown that there are many altered minerals in the periphery or interior of uranium veins and disseminated ores. A detailed study of alteration products and authigenic minerals in the veins can provide some answers to the general geochemical evolution of the host rock, the type of equilibrium reactions between granite minerals and fluids, and the characteristics of ore-forming solutions. 1. Analytical Techniques The altered minerals were studied using light microscopy, X-ray diffraction and electron probe analysis. The temperature and pressure conditions for the formation of altered minerals were determined by fluid inclusions from gangue minerals. Special attention has been given to the optical determination and research of clay