湖南平江金塘坳矿区地质、地球物理和地球化学特征与成矿条件分析

Analysis of geological,geophysical and geochemical characteristics and mineralization conditions in jintangao mining area of Pingjiang,Hunan

湖南平江金塘坳矿区地处湘东北,处于扬子板块与华南板块的会聚碰撞带上,属于江南造山带(湖南段)的北端,湖南平江万古矿区的南东面。该区域内金属矿分布众多,区内出露地层冷家溪群分布十分广泛,是该区域成矿地质中的重要基础。矿区开展的激电中梯测量结果显示两处异常,受构造控制,异常可能是金属硫化物富集的极化体。冷家溪群地层中金的含量普遍较高,且与硫元素含量呈正相关关系。金矿主要赋存于小木坪组(Pt_(2)x)浅变质岩系砂质板岩、粉砂质板岩、细砂岩之中。金矿成因可能是长期通过多次复杂的成矿地质作用逐步富集而成。矿体多富集在控矿构造在空间上作舒缓波状弯曲且起伏地段。可作为找矿的重要标志之一。

Hunan Pingjiang Jintang'ao Mining Area is located in the northeast of Hunan Province,in the convergence and collision zone between the Yangtze Plate and the South China Plate,belonging to the northern end of the Jiangnan Orogenic Belt(Hunan Section)and the south and east of the Pingjiang Wangu Mining Area in Hunan.There are many metal ores in this area,and the Lengjiaxi group of exposed strata in the area is widely distributed,which is an important foundation in the mineralization geology of the region.Measurements of the excitation ladder carried out in the mine show two anomalies,controlled by structure,which may be polarizations enriched by metal sulphides.The gold content in the Lengjiaxi Formation is generally higher and has a positive correlation with the sulfur content.The gold mine is mainly deposited in the sandy slate,silt slate and fine sandstone of the shallow metamorphic rock system of the Xiaomuping Formation(Pt_(2)x).The genesis of gold ore may be gradually enriched over a long period of time through multiple complex mineralizing geological processes.The ore body is mostly enriched in the controlled structure in space for soothing wavy curved and undulating sections.It can be used as one of the important symbols of prospecting.