摘要
川北甘南地区三叠纪时期沉积的岩相古地理明显地划分为早一中三叠世早期（安尼期），扬子大陆西缘台地相碳酸盐岩沉积；和中三叠世晚期（拉丁期）到晚三叠世中期（诺利期），特提斯边缘裂陷海槽浊流相碎屑岩沉积两个迥然不同发展阶段。金和伴生多金属组分来自边缘古陆，而边缘台地相白云岩化阶段和海湾相粉砂－粘土矿物沉积阶段是促成金矿初始富集的最佳环境。
The lithofacies and paleogeography of Triassic can be divided into two developing peri-ods:early of Early-Middle Trissic(Anny Period)with sedimentary of carbnate rock in westedge of platfacies of Yangzi content and later of Middle Trissic(Latin Period)to middle ofLater Trissic(Nory Period) with sedimentary of clastic rock of turbidity facies in pit troughof Tethyan edge fracture. The components of Au and accompanying polymetal came fromedge of ancient land, but dolomitization period of edge platfacies and period of silt-clay min-erals sedimentary of bay facies are the best environments facilitating primary richment ofgold deposits.
出处
《河南地质》
1994年第4期284-289,共6页
Henan Geology
基金
秦巴重点片地质找矿科技攻关项目
关键词
三叠纪
岩相古地理
成矿
Triassic,lithofacies-palaeogeography and mineralization,northern SichuanProvince,southern Gansu Province
