青海东大滩西余塔士沟地区金矿地质特征及找矿方向

东大滩地区经历了多期次的构造演化和岩浆活动,其中早古生代和晚古生代—早中生代时期的洋—陆转换过程对区内地层、构造、岩浆活动和成矿具有决定作用。通过对地质背景的分析,认为加里东期陆内碰撞造山活动叠加,沿昆中深大断裂带分支断裂旁侧形成一系列的北西向、北东向的次级断裂和破碎带,后期随着中酸性岩浆侵入活动,使成矿物质活化、迁移、富集、沉淀,形成了构造破碎蚀变岩型金矿,确立了找矿方向,用于指导地质勘查。

An Analysis on the Geological Characteristics and Prospecting Direction of Gold Deposits in Xiyu TashigouArea,Dongdatan,Qinghai

Dongdatan area has experienced many periods of tectonic evolution and magmatism,among which the early Paleozoic and late Paleozoic-early Mesozoic ocean-land transformation has a decisive role in the formation,including structure,magmatism and mineralization in the area.Through the analysis of geological background,we think caledonian period in intracontinental collision orogenic activity superposition is the deep fault belt in Kunduz branch fracture side to form a series of north west,north east to secondary fracture and fracture zone.With late intermediate-acid magma intrusion activities,it makes the activation,migration,enrichment and precipitation of metallogenic matters to form the structure shattered altered rock type gold deposit.It established the prospecting direction to look for a geological prospecting.