贵州广龙坡铅锌矿床地质特征及成矿机制探讨

Stduy on geological characteristics and metallogenic mechanism of lead-zinc deposit in Guanglongpo of Guizhou

广龙坡铅锌矿位于湘黔成矿带南段,铜仁(黔)—保靖(湘)深大断裂带以西。文章从矿体赋存空间及矿石特征、成矿古地理与区域构造演化、成矿物质来源对成矿机制进行分析;区内成矿物质硫主要来源于寒武系海相沉积蒸发岩中,铅来源于地球化学高背景值藻灰岩及通过区域迁移流体带入;研究区内成矿即是在台地边缘相藻灰岩丘体沉积成岩后受多期次构造驱使下进一步活化而成,区内铜仁(黔)—保靖(湘)深大断裂为成矿提供热能、赋矿空间及物质来源和通道。

Guanglongpo lead-zinc deposit lies in the southern of the Xiang-Qian metallogenic belt and the western of the TongRen（ Xiang）-Bao Jing（ Qian） deep fractured zone. This article analyzes the metallogenic mechanism exemplified to the features of the orebodies locations and ore characteristics,the paleogeographic lithologic and regional tectonic evolution,ore-forming material source.The metallogenic material S in the area is mainly from the evaporite of Cambrian system marine deposit,Pb is mainly from algal limestone of geochemical high background value and regional migration fluid. The mineralization in the study area is further activated by multi-stages structure after sedimentary diagenesis of the algal limestone mound in platform margin. The TongRen（ Xiang）-Bao Jing（ Qian） deep fractured zone in the area provides energy,ore bearing space,material source and channels.