青海清水河地区玉石矿形成机制与找矿前景分析

Discuss on forming mechanism and prospecting potential of jade ore in Qingshuihe region, Qinghai province

总结清水河地区玉石矿成矿地质背景、矿化体特征、矿石质量等地质资料,对其成因做出分析:(1)玉石矿体大都产于花岗闪长岩与碳酸盐接触带及于断裂带;(2)附近断裂的发育使得地层中形成大量的裂隙空间,提供容矿空间;(3)随着花岗闪长岩体的侵入,岩浆热液与化学性质较为活泼的大理岩或白云质大理岩等碳酸盐岩反应、交代使得成矿物质Ca、Mg、Si等进一步富集,遇到有利的容矿空间后再交代形成玉石矿体。

This paper summarizes the metallogenic geological background, mineralization features and ore quality of jade ore in Qingshuihe region, and make analysis on the genesises： （1） jade ore bodies are mostly hosted in the contact zone between granodiorite and carbonate or in the fault zone; （2） in stratum there are lots of fractures formed by faults, which provide space for ore bodies; （3） as the granodiorite intrude, reaction and metasomatism are happened between magmatic hydrothermal and carbonate rocks which are Chemically active such as marble and dolomitic marble. So that ore-forming elements, such as Ca, Mg, Si, are enriched, and ore bodies are formed in some suitable space.