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《Chinese Geology》 2003-02
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Evidence of magmatic petrology for the Yanshanian orogeny in the Dabie oroge n

DAISheng-qian1,2,DENGJin-fu1,WUZong-xu3,ZHAOHai-ling1,CHENJiang-feng4,DUJian-guo2(1.ChinaUniversityofGeosciences,Beijing100083,China;2.AnhuiInstituteofGeologicalSurvey,Hefei230001,Anhui,China;3.InstituteofGeology,StateSeismologicalBureau,Beijing100029,China;4.UniversityofScienceandTechnologyofChina,Hefei230026,China)  
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.
【Fund】: 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)
【CateGory Index】: P588.11
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