摘要
汇聚板块边缘是全球最重要的金矿成矿带。不同的构造单元产生不同类型的金矿化 ,在以挤压和转换挤压为主的增生地体中 ,伴随俯冲和碰撞造山过程形成造山带型金矿床 ,并可根据其形成深度分为浅带 ( <6km,15 0~ 3 0 0°C)、中带 ( 6~ 12 km,3 0 0~ 475°C)、深带 ( >12 km,>475°C) ;在岛弧和弧后拉伸裂谷 (盆地 )中形成浅成低温热液型和斑岩型金矿化。浅成低温热液型金矿化形成深度小于 2 km,温度低于 3 0 0°C,并可根据演化程度分为高硫化 ( HS)和低硫化 ( LS)
The plate convergent margin is the most important gold mineralisation zone.Various styles of mineralisation formed at different types of tectonic units.Orogenic gold deposits were formed during compressional and transpressional deformation process in accretionary and collisional orogens.On the basis of their depth of formation,the orogenic gold deposits are subdivided into epizonal (<6 km,150-300°C),mesozonal (6-12 km,300-475°C) and hypozonal (>12 km,>475°C).While epithermal and porphyry gold deposits were formed in the shallow (<5 km) parts of both island arc and continental arcs in compression through extensional regimes, and shallow regions that underwent the back arc crustal thinning and extension.
出处
《地质科技情报》
CAS
CSCD
北大核心
2000年第1期46-50,共5页
Geological Science and Technology Information
关键词
板块汇聚边缘
金矿床分类
金矿床
成矿作用
plate convergent margin
orogenic gold deposit
gold deposits classification
gold mineralisation