摘要
湖南金矿床类型按成矿地质环境和成矿作用划分为产于前寒武系浅变质岩中的变质热液金矿床、产于浅成相中酸性侵入体与沉积岩接触部位的次火山热液金矿床、产于中深成相花岗岩与前寒武系变质岩接触带周边的岩浆热液金矿床、产于泥盆系沉积岩中的浸染型金矿床,产于硫化矿床氧化带中的风化壳型金矿床,以及产于第四系河床冲积层中的砂金矿床六大类型。按照金矿床(点)集中区的大地构造特征和成矿控制因素的相似性,划分为湘西、湘东北、湘中、湘西南和湘南五个成矿区。
The gold deposits in Hunan province can he classified according to the oreforming geologic environment and the ore-forming process into six types, that is, the metamorphic hydrothermal gold deposits occurred in the Precambrian epimetamorphic rock series; the subvoleanic hydrothermal gold deposits occurred in the contact position between hypabyssal intermediate-acid intrusives and sedimentary rocks; the magmatic hydrothermal ones occurred around the contact zone between intermediate—plutonic granite and Precambrian metamorphic rocks; the disseminated ones occurred in Devonian sedimentary rocks; the weathering crust ones occurred in the oxidation zone of sulfide deposits and the placer ones occurred in the Quaternary river alluvium. In accordance with the similarity of gold deposit-centralizing areas in geotectonic setting and metallogenic factors, five metallogenic regions can be differentiated, i. e., western Hunan, northeastern Hunan, central Hunan, southwestern Hunan, and southern Hunan.
出处
《湖南地质》
1990年第4期9-14,22,共7页
Hunan Geology
关键词
金
矿床类型
分布规律
Gold
Types of ore deposit
Distribution pattern
