青海东昆中岩浆弧带侵入岩体中金矿床地质特征及成因探讨

近年来青海东昆仑成矿带发现了新的金成矿类型,金矿体主要赋存于东昆中岩浆弧带中酸性侵入岩体内的构造蚀变破碎带中。为了查明此类金矿床的成因,从矿床形成的地质特征、矿体特征及矿体与构造、岩浆活动的关系等方面进行分析,说明金矿体的容矿围岩为华力西期、印支期闪长岩、花岗闪长岩和花岗岩,北西向和北东向断裂为主要的控矿、容矿构造,成矿流体沿断裂带的裂隙系统中运移至减压部位成矿,在脆性剪切部位形成构造蚀变岩型金矿体。矿体成因属于构造蚀变岩型,具有较大的找矿空间。

Characteristics and genesis of gold mineralization in East Kunlun magmatic arc belt with intrusions of Qinghai

In recent years,a new type of gold mineralization in East Kunlun metallogenic belt was discovered,ore bodies mainly occur in the East Kunlun magmatic arc with acid intrusive rocks broken body structural alteration zone. In order to identify the causes of such gold deposits,geological features from deposits in the formation of ore characteristics and tectonic,magmatic activity relationship of ore were analyzed,the host wall rock for gold ore bodies are Variscan,Indosinian diorite,granodiorite and granite. Northwest and northeast trending faults,host rock fault are the main ore-controlling structure. Ore fluid migrated along the fault to pressure- lifting parts and mineralized In brittle shear site,structural alteration type gold deposit formed. Genesis of ore body belongs structural alteration type,with great prospecting space.