贵州大路锰矿区锰成矿作用与后期断裂构造的关系

大路锰矿经勘查确认为一隐伏大型锰矿床,与锅厂、大塘坡、杨立掌、黑水溪、道托、高地等大型、超超大型锰矿床共同产出于北东—南西走向的武陵次级裂谷盆地中。该区锰矿有一个共同点,埋深较大,如大陆锰矿体埋藏深度大多在1300～1500 m之间,由于矿体埋深大,地表无矿体露头,成矿后期断裂的影响对矿层的影响不可小觑,研究区成矿后期断裂多以正断层为主,对矿体破坏极大,在早期勘查中,若不慎钻孔刚好在成矿层位打穿断层,可能会造成对矿区前期成果否定,甚至有可能放弃对矿区的后期勘查工作,工作区曾因其成矿后期断裂的影响造成了对矿区成锰条件怀疑,文章通过区内地质、物探推断成矿后期断裂产出特征,其与断陷盆地主断裂的分布关系,以及其对矿层破坏作用,与钻探揭露结果进行对比分析,为后期该区及周边的锰矿勘查提供参考和借鉴。

Relationship between mineralization of manganese deposits in Dalu manganese deposit and fault structures in the late mineralization stage, Guizhou

Dalu manganese deposit has been identified as a large concealed manganese deposit by exploration. It occurs in Wuling sub-rift basin with NE-SW trending, together with large and super-large manganese deposits such as Guochang, Datangpo, Yanglizhang, Heishuixi, Daotuo and Gaodi. There is a common feature of manganese in this area. For example, the burial depth of the continental manganese ore bodies is mostly between 1300 m and 1500 m. Because of the large burial depth of the ore bodies and the absence of ore body outcrop on the surface, the influence of the fracture in the late metallogenic period can not be neglected. In the late metallogenic period of the study area, most normal faults are dominant, which destroy the ore bodies greatly. In the early exploration, if the drilling hole happens to be in the metallogenic horizo Breaking through faults may result in negation of the earlier achievements of the mining area, or even abandonment of the later exploration work of the mining area. The working area once doubted the Manganese-Forming conditions of the manganese deposits in the mining area because of the influence of the later faults. This paper infers the characteristics of the later faults, their distribution relationship with the main faults in the rift basin and their damage to the ore bed through geological and geophysical prospecting in the area. The effect is compared with the result of drilling exposure, which can provide reference for the later exploration of manganese deposits in this area and its surrounding areas.