摘要
花岗岩类岩石形成于不同的地质构造环境,具有不同的物质来源和不同的形成方式。根据与大地构造发展阶段的关系,将中国花岗岩类划分为两个成因类型:深成型花岗岩和火山型花岗岩。 (1)深成型花岗岩是指在地槽发展的褶皱回返时期形成的花岗岩类。这类花岗岩主要分布于各地质时期的褶皱带内,如产于阴山古陆东端前寒武纪褶皱带中的前寒武纪花岗岩、产于祁连山加里东褶皱带中的加里东期花岗岩、产于天山东端、内蒙大兴安岭和吉黑海西褶皱带中的海西期花岗岩等,皆属于此类。
Based on the relationship to the tectonic stages of development, the granites in China can be divided into two groups, the plutonic type and the volcanic type.There exist apparent differences, which mainly result from the differences of the sources and the types of process,in petrochemical indexes and petrochemical evolution between these two groups, such as acidity, alkalinity,differentiation index, oxygen ratio, the variation of oxides to differentiation index, the variation of magnesium index to differentiation index and the variation of An-Ab-Or.The plutonic granites were formed from the geosynclinal accumulations in the folding stage.With the plastic deformation of rocks, remelting and replacement occurred and thus granitic diapirs were formed. Under certain physico-chemical conditions, those diapirs may be transformed into plutonic granites.Volcanic granites have different origins. They are products of the magma from the deep part of the crust or the upper mantle. The magma moved up and, with the activity of volcanism, formed the epi-granites and subvolcanic rocks in the shallow part of the crust through the crystallization from high to low temperature.
出处
《吉林大学学报（地球科学版）》
EI
CAS
1983年第2期38-46,共9页
Journal of Jilin University：Earth Science Edition
