中国银矿床地质控矿规律及若干找矿方向

本文在前人研究的基础上,概述了地层、构造和岩浆岩对我国银矿产出和分布的控制特点和规律:银矿赋矿地层以泥盆系最多,其次是中元古界、石炭系等,按赋矿岩性则以碳酸盐岩最多,变质岩次之;古老地块边缘裂陷槽和增生带、区域性深大断裂及多组构造汇聚部位及陆相断陷盆地是我国银矿产出和分布的重要控制因素;海相火山岩、陆相火山岩、侵入岩控制着我国不同地区和类型的银矿产出。分析了我国大型、超大型银矿的找矿前景和方向,提出川西义敦岛弧带、川滇黔接壤地区和大兴安岭成矿带是大型、超大型银矿的重要找矿区,继续加强我国陆相火山岩型大型、超大型银矿的寻找和研究;重视在萤石矿床分布区、黑色岩系分布区找银矿及火山岩地区找银锰型矿床;充分利用银矿找钨、锡等其他矿种。

Factors controlling ore formation, regularity and some prospecting strategies for silver deposits in China

On the basis of previous studies, this paper summarizes the controlling role of stratigraphy, tectonics and magmatic rocks on the output and distribution of silver deposits in China. The most common ore bearing strata of silver deposits in China are Devonian, Mesoproterozoic, and Carboniferous. Carbonate and metamorphic rocks are the most important litologies. The marginal rifting and accretion zones of old blocks, regional deep and large faults, multi component structural convergence positions and continental fault basins are the important controlling factors for the occurrence and distribution of silver deposits in China. Marine volcanic, continental volcanic, and intrusive rocks control the output of silver deposits in different regions of China. This paper analyzes the prospecting outlook and regions of large and super large silver deposits in China, and notes that Yidun volcanic island arc belt, border areas of Sichuan, Yunnan and Guizhou province and Daxinganling metallogenic are the potential prospecting areas for large and super large silver deposits. The prospecting and research of large and super large silver deposits of continental volcanic rock type should continue to be strengthened, and silver deposits in fluorite deposits and black rock series areas as well as silver manganese deposits in volcanic rocks area should be explored. Finally, it is suggested that the silver deposits should also be prospected for tungsten, tin and other minerals.