黔西南灰家堡金矿田成矿构造特征研究

Research on metallogenic regulation of gold-rich deposits and features of metallogenetic structure in Huijiabao gold field,Southwest of Guizhou,China

灰家堡矿田中水银洞等金矿床具有极高的矿石品位,成为卡林型金矿床特例。通过矿田构造与矿床地质研究,结合CSAMT深部探测,文章提出了灰家堡背斜为含金超压流体上拱形成的气液热隆褶曲,含金超压流体沿背斜轴部破裂带和盲断裂爆破上涌,交代上覆围岩形成高品位的层控型和断裂型金矿体的成矿模式,中二叠统与上二叠统之间岩溶不整合构造(构造蚀变体)作为深部含矿流体的中转聚集站,本身也赋存大规模的金矿体,据此提出了多方位的深部成矿预测方案。

The Shuiyindong gold deposit in the Huijiabao gold ore field is an ultra-high grade special case in Carlin-type gold deposits. Based on researches on ore field structure and ore deposit geology, combined with the results of CSAMT measurement, the authors propose a new metallogenic model which holds that Huijiabao anticline was a gas-liquid heat upheaval fold resulting from the upwelling gold-bearing overpressure fluid, that the fluid up- welling in the explosive form along the fracture zone and blind fault replaced the covering rock to form the high grade stratabound and fault-bound gold ore bodies, and that the karst unconformity structure between middle Permian and upper Permian, i.e., the structural alteration body, served as the aggregation transshipment sta- tion, where there existed large-scale gold ore bodies too. The authors also present a multi-aspect suggestion for metallogenic prognosis at the depth of the ore field.