云南金顶铅锌矿床地质特征及成因新认识

Geological characteristics of Jinding Pb-Zn deposit and new cognition for the deposit genesis,Yunnan

云南兰坪金顶铅锌矿床以沉积岩为容矿围岩,矿床附近无岩浆岩出露;含矿层位及上下盘有沥青、膏盐层、煤层等,有丰富的烃源层,成因上与盆地油气卤水活动关系密切;丰富的矿源层,特定的储矿层位,矿化分布与构造关系密切,这些特征说明金顶铅锌矿是典型的后生矿床。随着地质工作的深入,越来越多的地质证据表明,金顶铅锌矿床的形成受推覆构造控制,与喜山期构造运动、深部岩浆及流体活动有关,是一个成因上与深部岩浆活动有关的特殊的"后生矿床"。

The Jinding Pb-Zn deposit in Yunnan Province, located in the edge of Pliocene basin and middle part of Bijiang fault, was hosted in sedimentary rocks.No any magmatie rocks outcrop near by the deposit. There are rich hydrocarbon source materials such as gypsum, eelestite, carbonate and asphalt.The formation of Pb-Zn deposit is closely related tooil-gas brine fluid activity materi- al within the basin.The characteristics of Jinding Pb-Zn deposit such as rich ore-hosting source layers, specific ore-storing space and close relationship with structures, indicate that the deposit is a typical epigenetic deposit.With further exploration work, more geological evidences show that the formation of Jinding Pb-Zn deposit was controlled by the nappe fault structure, closely related to Himalayan tectonic movement, deep magmatics and hydrotherulal fluids activity, therefore, the deposit is special ＂epigenetic deposit＂ related to deep magmatic activities.