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小寺沟位于华北地块北缘燕山台褶带中段,张家口-平泉-北票大断裂南侧及派生的北东和北西两组共轭断裂之间.大断裂北盘为太古界片麻岩,南盘有元古界和下古生界碳酸盐岩建造以及中新生界火山-沉积建造.斑岩以小岩株侵入于雾迷山统灰岩中.岩体由花岗斑岩、花岗闪长斑岩及闪长斑岩组成;出露长5000k m、宽1～1.5km;走向310～330°、向南西陡倾斜.成岩年龄129百万年,矿化受北东接触带及平行接触带的断裂构造(花岗斑岩)控制,矿化与硅
Xiaositonggou is located between the Yanshantai fold belt in the northern margin of North China block, the Zhangjiakou-Pingquan-Beipiaojiang fault southward and the derived north-east and north-west conjugate faults.The north plate of the large fault is Archean gneiss, There are Proterozoic and Lower Paleozoic carbonate rocks in Nanpan and volcanic-sedimentary deposits in the Mesozoic and Cenozoic.The porphyry intruded into the Mimalayan limestone with small rock mass.The granite was composed of granite porphyry, granite Diorite porphyrite and dioritic porphyrite, with a length of 5000 km and a width of 1.5 km, a strike of 310-330 ° and a steep slope to the southwest and a diagenetic age of 129 million years. Mineralization is affected by the North East contact zone and parallel The contact zone of the fault structure (granite porphyry) control, mineralization and silicon