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陕西南部秦岭、巴山地区集中分布有各种类型的花岗岩类,出露面积约1.6万平方公里,约占该区基岩分布面积的20％。岩体形成的时代为元古代、加里东、海西、印支和燕山期,其中以印支期的规模最大,分布最广。本区花岗岩类,根据其物质来源和成岩方式可分为三种主要成因类型:一是由上地幔物质分熔作用所产生的中、基性岩浆,除自身分异作用外,还有与地壳物质的同化作用、混
Various types of granitoids are concentratedly distributed in Qinling and Bashan areas in the south of Shaanxi Province. The exposed area is about 16,000 square kilometers, accounting for about 20% of the bedrock area in this area. The formation of rock mass is the Proterozoic, Caledonian, Hercynian, Indosinian and Yanshanian period, of which the Indo-Chinese largest scale, the most widely distributed. The granitic rocks in this area can be divided into three main types of genesis according to their source of material and diagenetic methods. The first is the magma derived from the sub-melting of the upper mantle. In addition to its own differentiation, Material assimilation, mixed