大别造山带燕山期造山作用的岩浆岩石学证据  

Evidence of magmatic petrology for the Yanshanian orogeny in the Dabie oroge n

作　　者：戴圣潜[1] 邓晋福[1] 吴宗絮[2] 赵海玲[1] 陈江峰[3] 杜建国[4] 

机构地区：[1]中国地质大学,北京100083 [2]国家地震局地质研究所,北京100029 [3]中国科技大学,安徽合肥230026 [4]安徽省地质调查院,安徽合肥230001

出　　处：《中国地质》2003年第2期159-165,共7页Geology in China

基　　金：国家自然科学基金项目(49772155); 原地质矿产部"九五"重大科技项目(9501102-03); 中国地质调查局综合研究项目(200113900018)

摘　　要：在区域地质填图基础上研究了大别地区燕山期岩浆岩,重新划分了该区燕山期岩浆作用期次,发现大别地区在燕山期存在一个完整的造山岩浆旋回。首次提出本区燕山晚期岩浆岩为双峰式组合,与燕山早期岩浆岩属高钾钙(碱)性-钾玄岩组合一起构成一个从挤压到伸展的造山岩浆旋回,成为燕山期造山的重要佐证。岩浆岩成因特点揭示出本区的岩石圈结构在燕山期存在一个从双倍陆壳到正常陆壳的过程,深部地质过程则是底侵作用和拆沉作用的继续。On the basis of regional geological mapping,the authors studied Yanshanian rocks in the Dabie area,re-determined the phases of Yanshanian magmatism and fo und the existence of a complete orogenic magmatic cycle in the area.They for the first time propose that the late Yanshanian magmatic rocks in the area constitu te a bimodal association,which combines with the early Yanshanian magmatic rocks (belonging to high-K calc-alka-line-shoshonitic association)to form a compressional to extensional orogenic magmatic cycle.This is important evidence of Yanshanian orogeny.The features of origin of magmatic rocks have revealed that the lithosphere structure in the ar ea experienced a process from double continental crust to normal continental cru st in the Yan-shanian stage.The deep geological process was the continuation of underplati ng and delamination.

关 键 词：大别造山带 燕山期 造山作用 岩浆岩 底侵作用 拆沉作用 

分 类 号：P588.11[天文地球—岩石学]