摘要
华北地台与金矿床有关的花岗岩,其岩浆水以δD值较低为特征(-120‰——85‰),古老结晶基底变质水同样亦以贫δD为特征(-95‰)。中国不同类型金矿床成矿流体具有多来源多成因特征,但最突出的特征是皆在不同程度上混有大气降水成分。中国东部金矿床成矿流体δD在地理分布上表现出明显的纬度效应和海岸效应,且与我国中生代大气降水等值线一致。借助被加热循环的大气降水使矿源层(岩)中的成矿物质活化和再富集是金矿成矿的一种具有普遍意义的成矿方式。
The magmatic water of granitoid related with gold deposits in. North China Platform is characterized by low SD values (-120-85‰) .The metamorphic water of ancient crys-talline basement is also characterized by low SD values (- 95‰) .The ore fluid of different types of gold deposits in China are characterized by multi-source and multi -origin, and the prominent feature is that the fluids are mixed with the meteoric water in various ex-tent. Therefore, the SD distribution of ore fluids of gold deposits in Eastern China manifests distinct latitude effect and coastal effect, and is in accorance with the contour of δSD values of Mesozoic meteoric water in China. The general metallogenic mechanism of gold deposits is that the ore -forming substances in source bed (rock) are remobilized and re -concentrated by the circulation of heated meteoric water.
关键词
金矿床
氢
氧
同位素
地球化学
gold deposit hydrogen and oxygen meteoric water latitude effect remobilization mineralization
