流体与铅锌成矿作用刍议——以大瑶山凸起西南缘平硐—旺石铅锌成矿带为例

PRELIMINARY STUDY ON THE METALLOGENY OF FLUID AND LEAD-ZINC ORE FORMATION——Giving an Example in Pingong-Wangshi Lead-Zinc Deposits in the Southwest of Dayaoshan

流体在成矿过程中起重要作用。大瑶山凸起西南缘平硐—旺石铅锌成矿带的地质背景极有利于流体的活动和大型、超大型矿床的形成。据成矿环境、含矿建造、矿体和矿石特征、围岩蚀变、成矿温度等方面对比 ,该区在成因上具有MVT铅锌矿床的特点。诸多矿石组构如条带状、角砾状、皮壳状等的特征均表明该区矿床的形成与成矿流体关系密切。

Fluid plays an important role in the ore-forming process. The geological background of Pingdong-Wangshi lead-zinc deposits, a zone in the southwest of Dayaoshan, is very advantageous for the fluid to extract and transfer the ore elements and form deposits. The authors draw a conclusion that the deposits are equivalent to the ore in carbonate rock and named sedimentary transformation deposit. According to geological background, ore-bearing formation, ore structure, host rock alteration, and ore formation temperature the deposits resemble the Mississippi Valley-type lead-zinc deposit. The authors have studied lots of ore structures in the deposits, and some typical structures such as brecciaform,banding and crustification show that the ore-forming fluid is indispensable for the deposits in the zone.