大坪金矿床地质特征及成因浅析

Analysis on deposit geological characteristics and genesis of gold deposits in Daping Yuanyang County of Yunnan Province

大坪金矿位于扬子准地台的丽江台缘褶皱带,三级构造单元为点苍山—哀牢山断褶束,位于哀牢山深大断裂南段西侧的浅变质岩带内。矿区内沉积岩集中出露在勘查区的南西和中部地区,出露下奥陶统、中上志留统、泥盆系和第四系地层。岩浆岩主要为桃家寨闪长岩体和燕山期的二长花岗岩体。区域内构造以断裂为主,规模巨大的北西向红河深大断裂和哀牢山深大断裂控制着区域内变质岩、岩浆岩及金矿带的分布。本文初步分析了大坪金矿的矿床成因,该矿床属于剪切带控制下的中深中温热液金多金属矿床。

Daping gold deposit is located in the Lijiang Taiwan margin of the Yangtze paraplatform fold belt, three tectonic units of Cangshan Ailaoshan fault fold beam, is located in the shallow metamorphic rock of Ailao Mountain deep fault zone on the west side of the southern section. In the mining area of sedimentary rocks exposed in the exploration area in the southwest and central regions, exposing the lower Ordovician, Silurian, Devonian and quaternary strata. The magmatic rocks are mainly the two member of the Yanshan province. Regional faults, the huge size of the NW trending deep faults and deep Honghe Ailaoshan fault controlled distribution of regional metamorphic rocks, magmatite and gold belt. In this paper, a preliminary analysis of the genesis of the Daping gold deposit, the deposit belongs to mesothermal gold polymetallic deposit in the deep under the control of the shear zone.