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区内以中基性岩为主的岩浆岩很发育.岩体严格沿陕东南早古生界洞河群与跃岭河群地层的接触界面作北西西向展布,形成长达数十公里的中基性岩带.岩带中有一种闪长岩,呈脉状、透镜状顺层产出,成群出现,分异明显.这种岩脉长数十至三百余米,宽数十至一百多米.较大的岩脉自边缘至中心可分出浅色相、过渡相和暗色相;各相矿物组成、结构构造有一定差异,含伟晶金红石的斜长岩产于暗色相中,受三组与岩体产状斜交的裂隙控制.闪长岩由石英(8.4%)、斜长石(37.2)、白云母(4.7)、角闪石(8.4)、黑云母(10.3)、钛铁矿(5.1)金红石(0.1)以及绿泥石、楣石、黄铁矿、磷灰石等组成.斜长岩由斜长石(74.5%)、白云母(7.5)、金红石(5)、钛铁矿(微量)以及绿泥石、楣石、黄铁矿、磷灰石等组成.钛铁矿与金红石在两种岩石中的含量互为消
The magmatic rocks dominated by medium-basic rocks are well developed, and the rock mass is distributed along the contact interface of the Donghe-South Paleozoic Donghe and Yueling Group stratigraphically northwestward to form dozens of kilometers In the rock zone there is a kind of diorite, vein, lenticular layer yield, appear in groups, distinct differences.This dilapidation of several tens to 300 meters, a few dozen wide To more than 100 meters.The larger veins can separate the light phase, the transitional phase and the dark phase from the edge to the center. The composition and structure of the minerals in each phase are different. The plagioclase containing pegmatite is produced in dark phase , Controlled by three groups of fractures that are oblique to the rock mass.The diorites consist of quartz (8.4%), plagioclase (37.2), muscovite (4.7), hornblende (8.4), biotite ), Ilmenite (5.1) rutile (0.1), chlorite, lintel, pyrite, apatite etc. The plagioclase is composed of plagioclase (74.5%), muscovite (7.5), rutile 5), ilmenite (trace) and chlorite, lintel, pyrite, apatite, etc. The content of ilmenite and rutile in each kind of rock cancel each other