滇西北宁蒗县白牛厂铅锌矿成矿地质条件

STUDY ON MINEROGENETIC GEOLOGICAL CONDITIONS OF BAINIUCHANG LEAD-ZINC DEPOSIT IN NINGLANG AREA OF NORTHWESTERN YUNNAN

宁蒗地区白牛厂铅锌矿区位于区域性牛窝子－罗卜地帚状构造的内旋断裂带－白牛厂弧形断裂的折拐部位。该部位喜马拉雅晚期隐伏合矿斑岩体发育，其围岩地层一下二叠统（P1x）灰岩亦具一定的含矿性。由白牛厂弧形断裂伴生的低级次日牛厂帚状断裂构造带又为本区矿液运移和矿体赋存提供了良好通道和有利空间。在白牛厂隐伏斑岩体与共围岩（P1x灰岩）的外接触带、构造叠合地段，有望形成斑岩体外接触带热浪型铅锌（银）多金属矿床。

Bainiuchang mineral district of Ninglang area lies in the flex position of Bainiuchang arc fault which belongs to the inner fault belt of regional Niuwozi - Luobodi broom - shapes structure. At this structural POsition developed Himalayan blind porphyry bodies, and their wallstrata (p1), being limestone, are also mineral - bearing. Bainiuchang broom - shapes fault belt, which is an accompanied structure of Bainiuchang arc falult, provides a good passageway for minerogenetic solution to transport and a favorable space for orehody to reside in. It is likely for hydrothermal lead- zinc deposit to form at the position where fault structure superposed on theexocontact zone of Bainiuchang blind porphyry bodies with their wall - strata(p1 )of limestone.