尕林格大型隐伏铁铅锌矿床的地质特征及成因分析

Geological characteristics and genetic analysis of the Galinge large concealed iron lead-zinc deposits

尕林格铁铅锌金属矿床位于青海省东昆仑西段祁漫塔格弧后裂陷盆地中部。通过近几年大规模开展工作,对矿床的地质特征及成因进行了分析研究,总结了找矿标志。分析表明:矿体主要分布在滩间山群下岩组(∈Οta)大理岩与硅质岩界面附近产矽卡岩,矿石类型主要为磁铁矿,其次为方铅矿、闪锌矿,局部地段共(伴)生黄铜矿、金矿、钴矿。在寒武—奥陶纪海底火山喷发—沉积、热水喷流—沉积共同作用形成了一套碎屑岩夹中基性火山岩、硅质岩、碳酸盐的含铁建造,成为本矿区多金属矿的矿源层。华力西期和印支—燕山期的岩浆活动使侵入岩与围岩发生双交代,成矿物质活化、转移、富集,形成了火山喷流沉积—岩浆热液叠加改造型矿床。

Galinge iron polymetallic deposit is located in the area of east Kunlun fault Qimantage back-arc lacunae of the central part of the basin of Qinghai Province.Based on large-scale work in recent years,the geological characteristics and genesis of the deposit were analyzed and the prospecting indicators were summarized.Ore body is mainly distributed in the beach mountains between the rock group(∈Οta) marble and siliceous rock near the interface production skarn and ore type is mainly magnetite,followed by galena,sphalerite,and locally co-existed chalcopyrite,gold and cobalt ore.Submarine volcanic eruption-sedimentary,exhalative-deposition worked together to form a clastic rocks in mafic volcanic rocks,chert and carbonate iron formation in the Cambrian-Ordovician,resulted in the mine source layer of polymetallic ore.Variscan and Indosinian-Yanshanian magmatism led to bimetasomatism between intrusive rock and wall rock.The activation,transfer,enrichment of ore-rock-forming caused the formation of volcanic flow deposits-magmatic hydrothermal superimposition reformed deposit.