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一、区域地质概况 小秦岭地区位于秦岭东西复杂构造带之北缘,祁吕——贺兰山字型构造弧顶之南东以及新华夏系太行山隆起褶皱带西南端上。区内出露地层主要是太古界太华群变质岩系,总厚度为1万余米,形成年龄大于18.35亿年,主要岩石有斜长角闪岩,黑云角闪(斜长)片麻岩、混合岩、石英岩及大理岩等。区内岩浆岩种类较多,分布广泛,岩浆岩主要为花岗岩类,其次是伟晶岩,再次是各种脉岩,生成时代大体可分为嵩阳期、熊耳期、晋宁期、加里东期和燕山期;尤以燕山期活动最强烈,产出岩体规模最大,分布最广泛。
I. Regional Geological Profile The small Qinling area is located on the north margin of the complicated structural belt of East and West Qinling Mountains, on the south east of the Qilu-Helan Mountain structural arc and on the southwestern end of the uplift fold belt of the Xinhuaxia Formation. The exposed strata in the area are mainly Archean Taihua Group metamorphic rocks, with a total thickness of over 10,000 meters, forming an age of more than 1.835 billion years. The main rocks include amphibolite, hornblende (plagioclase) Rock, mixed rock, quartzite and marble and so on. There are many types of magmatic rocks in the area, which are widely distributed. The magmatic rocks are mainly granitoids, followed by pegmatites and again various veins. The generative age can be divided into Songyang period, Xiong’er period, Jinning period, Caledonian, Period and Yanshan period; especially in the Yanshan period the strongest activities, the largest output rock mass, the most widely distributed.