青海省门源县扎麻图金矿床地质特征及找矿标志

青海省门源县扎麻图金矿大地构造位置处于北祁连板块范围内。该文在阐述成矿地质背景和矿床地质特征的基础上,从地层、构造、岩浆活动等方面分析了控矿因素和找矿标志,并对矿床成因进行了探讨。认为该矿床属于浅成低温热液型矿床,主要控矿因素为断裂构造破碎带,其次加里东晚期的中-酸性岩浆活动也是矿床形成必不可少的条件;主要找矿标志为地层岩性、构造蚀变破碎带、矿化蚀变、地球化学异常;加里东晚期,强烈的中-酸性岩浆侵位活动不仅控制了金矿体的就位,也带来了成矿物质,提供了热源;而频繁的构造运动为成矿物质的活化、迁移、富集、沉淀提供了通道和容矿场所,进而形成金矿床。

Geological Characteristics and Indicators of Zhamatu Gold Deposit at Menyuan County of Qinghai Province

Zhamatu gold deposit is located in the north Qilian plate at Menyuan county of Qinghai province. Based on the metallogenic background and geological features, we stated the ore-controlling factors, ore guides, and discussed the genesis of mineral deposit with the analysis of the stratum, tectonics and magmatic activities. We find that genetic type is low temperature hydrothermal deposit. The main ore-controlling factor is the fault structures and the medium-acidic magmatic activity is one of the essential conditions. Stratum and lithology, tectonic alteration and crushed zone, mineralized alteration and geochemical anomaly are the main indicators. The strong invasion of acidic magma in late Caledonian controlled the location of the gold mine and offered the materials and heat. And the constant tectonic movements provided the channel and space for the transportation, mobilization, enrichment and sediment of the gold mine.