思茅大平掌铜多金属矿床地质特征及成矿机制

THE GEOLOGICAL CHARACTERISTICS AND METALLOGENETIC MECHANISM OF DAPINGZHANG MULTIMETALLIC CU DEPOSIT, SIMAO

大平掌铜矿属火山成因铜多金属矿床。主矿体———浸染状矿体为次火山热液型 ,受英安岩等组成的火山穹窿构造及隐爆角砾岩筒构造所控制 ,赋存部位为火山管道之隐爆角砾 次火山岩相 ;块状矿体是在D2 ～C1海相火山喷发时期形成 ,受后期构造及火山 次火山岩体侵位破坏 ,呈角砾状分布在构造破碎带中。

The Dapingzhang Cu deposit is a multimetallic Cu deposit formed by volcanism. The main ore-body-disseminated ore-body is of a subvolcanic hydrothermal type, which is controlled by dacite volcanic arch and cryptoexplosion breccia pipe structures and occurred in the cryptoexplosion breccia-subvolcanic lithofacies of volcanic channel. The massive ore body is formed in the D 2～C 1 marine-facies volcanic eruption, broken by later structure and emplacement of volcanic-subvolcanic rock body and distribu-ted brecciatedly in the structural fracture zone. Generally speaking, it is a composite Cu deposit of submarine volcanic eruption-exhalation deposition and subvolcanic hydrothermal superimposed reformation.