浏阳县七宝山多金属矿区东西两端,近年来发现黑土层中含金银较高,通过地质工作证实为黑土型金银矿床。现据已取得的资料,对金、银赋存状态及成矿机理进行粗浅的分析和探讨。一、矿区地质概况 (一)地层 1.元古界冷家溪群:为一套岩性单一、厚度巨大的浅变质岩系。主要岩性为浅灰色、灰绿色千枚状板岩、千枚岩等。厚度大于1000米。 2.震旦系下统莲沱组:分布于矿区北部。为浅灰色变质砂岩夹砂质板岩。厚20—150米。与下伏地层呈不整合接触。 Liuyang County Qibao Mountain polymetallic mining area east and west ends of the black soil in recent years found to contain higher gold and silver, confirmed by geological work for the black-type gold and silver deposits. According to the data already obtained, the superficial analysis and discussion on the state of gold and silver deposit and the metallogenic mechanism are carried out. First, the geological overview of the mining area (a) strata 1. Proterozoic cold Jiaxi Group: a set of lithological single, huge thickness of the metamorphic rock series. The main lithology is light gray, gray-green thousand-shaped slate, phyllite and so on. Thickness greater than 1000 meters. 2. Sinian Lower Reaches Tuo Formation: Located in the northern part of the mining area. Light gray metamorphic sandstone nacreous slate. Thick 20-150 meters. Unconformity with underlying strata.