摘要
在地质年代久远的晚二叠世至三叠纪的印支期,岷县境内发生了大规模的构造运动,岩浆活动强烈,中酸性岩浆的侵入使地层断裂、位移,为本矿区富集成矿提供了重要的动力源、热液及容矿构造,教场坝岩体对区域周边成矿起到主要作用,侵入体的存在是矽卡岩成矿的一个前提条件。某些矽卡岩矿体就产生在体积较大的捕虏体中。通过描述区域内地质特征及分析矿体成因后认为米家沟矿体应为矽卡岩型捕掳体成矿。
In the Indosinian period from the Late Permian to the Triassic,a large-scale tectonic movement occurred in Minxian County with strong magmatic activity.The intrusion of medium acidic magma caused strata fracture and displacement,which provided an important power source,hydrothermal and ore bearing structure for the enrichment and mineralization of the mining area.Jiaochangba rock mass played a major role in the mineralization of the surrounding area.The existence of intrusions is a prerequisite for the mineralization of skarn.Some skarn ore bodies occur in larger xenolith.By describing the geological characteristics of the area and analyzing the origin of the ore body,it is concluded that the Mijiagou ore body should be a skarn type trap mineralization.
作者
张忠伟
ZHANG Zhongwei(Tianshui Mineral Exploration Institute of Gansu Non-Ferrous Metals Geological Exploration Bureau,Tianshui 741020,China)
出处
《甘肃冶金》
2024年第1期128-131,共4页
Gansu Metallurgy
关键词
米家沟金矿体
教场坝岩体
地质特征
成因探讨
Mijiagou gold ore body
Jiaochang dam rock mass
geological characteristics
discussion on the cause
