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区域地质概况栗木矿田位于广西恭城向斜扬起端.区内出露地层有寒武系浅变质砂岩、粉砂岩、板岩,泥盆系砾岩、砂页岩、灰岩,下石炭统硅质页岩和灰岩.岩浆岩为花岗岩,呈岩株状,沿近南北向断裂侵入,地表出露面积约1.5平方公里.钻探表明,在矿田的约100平方公里范围内,在负200米标高,可能为一大的隐伏岩基.花岗岩属燕山早期产物,据同位素年龄,划分为三个幕:第一幕,185～196百万年,为细粒斑状锂白云母花岗岩;第二幕,174百万年,为白云母花岗岩;第三幕,160百万年,为花岗岩. 钽铌花岗岩矿床产于区内岩浆分异演化晚期侵入的第三幕花岗岩顶部及其边缘凸起部位,如老虎头含矿花岗岩株出露地表;水溪庙含矿花岗岩凸起隐伏于下石炭统和泥盆系灰岩、大理岩之下(埋深300米左右);金竹源含矿花岗岩凸起隐伏于寒武系砂页岩之下(埋深350～600米).脉状
Regional Geological Survey The chestnut ore field is located at the beginning of the Gongcheng anticline in Guangxi where Cambrian phyllite, siltstone, slate, Devonian conglomerate, sand shale, limestone and lower carboniferous Siliceous shale and limestone.The magmatic rocks are granite, rock-like, along the recent north-south fault intrusion, the surface exposed area of about 1.5 square kilometers.Drilling shows that in the ore field of about 100 square kilometers, in the Negative 200 meters elevation, may be a big hidden rock base.Granite is a product of the early Yanshan, according to isotope age, is divided into three screens: The first act, 185 ~ 196 million years, as fine-grained lithium-white mica granite; The second and 174 million years are muscovite granite, the third and 160 million years are granite, and the tantalum and niobium granite deposits originate from the third stage of granite intrusion and laterally convex at the late stage of magmatic differentiation and evolution From the site, such as the tiger head ore-bearing granite strain exposed surface; ShuiXiaoMiao ore-bearing granite bump in the lower Carboniferous and Devonian limestone, marble (buried depth of 300 meters); JinZhuYuan ore The granite bumps are buried beneath the Cambrian sand shale (350 to 600 meters deep)