Metallogenic Geological Conditions and Metallogenic Prediction of Datangpo-style Manganese Deposits in Dayanao Depression Syncline, Southwest Hunan
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摘要: “大塘坡式”锰矿主要分布于黔湘渝毗邻区，形成于南华纪大塘坡间冰期，其成矿作用受地层、古构造控制，成矿后构造对矿床的空间分布影响较大。本文以黔阳盆地内最大的次级成锰盆地——大岩坳盆地为例，分析了大岩坳向斜对大岩坳盆地内锰矿空间分布的控制作用，并在此基础上划分了预测区。黔阳盆地控盆控矿特征研究表明，北东向同沉积古断裂与北西向武陵-雪峰褶皱基底浅层断裂交汇部位及附近为次一级断陷盆地中心，次一级的断陷盆地在走向上（北东向）呈串珠状分布，垂直走向上（北西向）呈大致线状排列，整体呈网格状分布。据此确定成锰预测区位于照洞-桃阳坪同沉积古断裂一线，其与北西向武陵-雪峰褶皱基底浅层断裂交汇部位是本区寻找中-大型锰矿床的有利地段。本次研究初步确定了照洞、磨石-马颈坳-海坡、易家冲及渔滩4个V级断陷盆地，根据成矿后构造特征结合古构造控盆控矿特征圈定了南、中、北3个预测区。Abstract: Distributed in adjacent areas of Guizhou, Hunan and Chongqing, Datangpo Formation manganese ore isformed in Datangpo Inter-glacial period of Nanhua periodwith mineralization controlled by strata and paleostructure, resulting in great influence on the spatial distribution of deposits by the post-mineralization structure. Taking the largest secondary manganese-forming basin-Dayanao basin in Qianyang Basin as an example, this paper analyzes the controlling effect of Dayanao syncline on the spatial distribution of manganese deposits in Dayanao basin, and divides the prediction area on this basis. The basin-controlling and ore-controlling characteristics of Qianyang Basin indicate that the intersection and vicinity of the NE synsedimentary paleofault and the NW Wuling-Xuefeng fold basement shallow fault are the center of the secondary rift basin. The faulted basins of the second grade are beaded in strike (NE) and roughly linear in vertical strike (NW),generally distributed in a grid shape. On this basis, the prediction area of manganese formation is located in the direction of Zhaodong-Taoyangping syndepositional paleofault, theintersection of which with the shallow faults of the NW-trending Wuling-Xuefeng fold basement is an important position for finding medium-large manganese deposits in this area. In this study, four V-level graben basins of Zhaodong, Moshi-Majingao-Haipo, Yijiachong and Yutan were preliminarily determined. According to the tectonic characteristics of post-mineral structure and paleo-tectonic basin control and ore control, three prediction areas were delineated, including the south, middle and north.
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