CAJ | 학술논문

嵩溪银矿位于粤东晚古生代梅县-惠阳坳陷带的北段,晚侏罗世陆相火山岩盆地的边缘.区域成矿地质背景研究表明,晚侏罗世是粤东构造岩浆活动最强烈时期,火山岩的原始成岩物质来源于下地壳.地质勘探表明矿体在空间上呈脉状分布于早、中侏罗世的地层中,受断裂构造控制,矿石的结构构造和蚀变的分带性说明矿床具典型的热液矿床特征.矿石的铅同位素组成具壳幔混合铅特征,成矿物质来源于深部岩浆;矿石硫同位素组成和与成矿有关的石英脉的氢氧同位素、方解石脉的碳同位素组成特征,说明成矿热液以岩浆热液为主.根据矿床的矿化蚀变特征和成矿物质、成矿热液来源,结合区域成矿地质背景、矿区周边岩浆岩分布特征和岩浆岩成份及其来源的综合分析,认为嵩溪大型银矿床的形成与晚侏罗世陆相火山作用有关,矿床成因类型为陆相火山岩浆期后热液脉状矿床.
숭계은광위우월동만고생대매현-혜양요함대적북단,만주라세륙상화산암분지적변연.구역성광지질배경연구표명,만주라세시월동구조암장활동최강렬시기,화산암적원시성암물질래원우하지각.지질감탐표명광체재공간상정맥상분포우조、중주라세적지층중,수단렬구조공제,광석적결구구조화식변적분대성설명광상구전형적열액광상특정.광석적연동위소조성구각만혼합연특정,성광물질래원우심부암장;광석류동위소조성화여성광유관적석영맥적경양동위소、방해석맥적탄동위소조성특정,설명성광열액이암장열액위주.근거광상적광화식변특정화성광물질、성광열액래원,결합구역성광지질배경、광구주변암장암분포특정화암장암성빈급기래원적종합분석,인위숭계대형은광상적형성여만주라세륙상화산작용유관,광상성인류형위륙상화산암장기후열액맥상광상.
The Songxi silver deposit is located in the north segment of the late Paleozoic Meixian-Huiyang depression zone in the East Guangdong, at the margin of the late Jurassic terrestrial volcanogenic basins. There are two large scale silver polymetallic deposits as well as many ore spots in the east Guangdong, which is a metallogenic province of nonferrous metals and silver. A study on the metallogeny of the deposit from regional geology is helpful for the recognition of metallogenic characters and ore exploration in the area. The regional metallogenic geological background shows that tectonic and magmatic activities in the east Guangdong are most intense in late Jurassic. Many terrestrial volcanic eruption basins are distributed along an deep fault zone. The rock-forming substances of the volcanic rocks were originated from the lower crust. The geological exploration has shown that the vein orebodies controlled by faults occur between the lower and the middle Jurassic. The textures and structures of the ores as well as the alteration zoning indicate that it is a typical hydrothermal deposit. The Pb isotopic composition is of mixture lead of both the crust and the mantle, showing that the ore-forming substances should be originated from deep magma. The S isotopic compositions of the ores, H-0 isotopes of the ore-forming vein quartz and the C isotopic compositions of the vein calcite indicate that the ore-forming fluid is mainly originated from magma. Based on the mineralization and alteration characters, origins of the ore-forming substances and ore-forming fluid, combined with the regional metallogenic geological background, the magmatic distribution and magmatic composition, it is proposed in the paper that the deposit is closely related with the late Jurassic terrestrial facies volcanism, belonging to the terrestrial facies volcanogenic post-magmatic hydrothermal deposit.