云南西畴芭蕉箐铅锌矿矿床地质特征及找矿意义

Geology and significance of the Bajiaoqing lead-zinc deposit in Xichou, southeastern Yunnan

关键词:  滇东南  芭蕉箐  铅锌矿  矿床地质特征  找矿意义

Key words:  southeastern Yunnan  Bajiaoqing  lead-zinc deposit  geology  significance for ore prospecting

摘要:

芭蕉箐铅锌矿床是云南麻栗坡地区新发现的一个具找矿潜力的铅锌矿床。本文系统介绍了该矿床的成矿地质背景、矿床地质特征,并探讨其成因及区域找矿意义。研究表明,芭蕉箐铅锌矿受地层-构造-岩浆岩三位一体控制,矿体赋存在田蓬组薄层状灰岩夹千枚岩中,受层位控制明显;芭蕉箐复合纵弯褶皱及其伴生断裂构造控制着矿体的产出;隐伏花岗岩体为矿床形成提供了重要物质来源、流体及热源,同时亦为围岩中成矿物质的活化、迁移和富集创造了条件。属与岩浆有关的中低温热液型铅锌矿床。芭蕉箐矿床与蒙自白牛厂超大型银铅锌多金属矿床成矿地质特征类似,其外围地区具有找到相同类型铅锌矿床的良好远景。

Abstract:

The Bajiaoqing lead-zinc deposit in Xichou is a magmatic-associated low-to moderate temperature hydrothermal lead-zinc deposit of great potential discovered not long ago in the Malipo area, southeastern Yunnan. The emphasis in the present paper is placed on geological setting and characteristics, genesis and regional significance for the exploration of the lead-zinc deposit. The results of research show that the Bajiaoqing lead-zinc deposit is controlled by the combination of strata, structures and magmatic rocks, and hosted in the thin-bedded limestones intercalated with phyllites in the Tianpeng Formation. The Bajiaoqing compound folds and their associated faulted structures exercise a major control on the occurrence of the ore bodies. The concealed granite plutons have not only provided the ore-forming matter, fluids and heat sources for the formation of the lead-zinc deposit, but also contributed to the activation, migration and enrichment of the ore-forming matter in the wall rocks. Similar to the geology of the Bainiuchang supergiant silver-lead-zinc deposit in Mengzi, Yunnan, the Bajiaoqing lead-zinc deposit and its surrounding areas must be considered highly prospective for the exploration of the lead-zinc deposits.