Ophiolites from the Mianlüe Suture in the Southern Qinling and Their Relationship with the Eastern Paleotethys Evolution  

作　　者：LAIShaocong ZHANGGuowei LISanzhong 

机构地区：[1]KeyLaboratoryofContinentalDynamics,MinistryofEducation Det~rtmentofGeology,NorthwestUniversity,Xian,Shaanxi710069 [2]CollegeofEarthScience,OceanUniversityofQingdao,Qingdao,Shandong266003

出　　处：《Acta Geologica Sinica(English Edition)》2004年第1期107-117,共11页地质学报（英文版）

基　　金：the National Nature Science Foundation of China(Grant Nos.40234041, 49732080); the Teaching and Research Award Program for Outstanding YoungTeachers in HigherLearning Institutions of the Ministry of Education of China.

摘　　要：The Mianlue suture extends from Derni-Nanping-Pipasi-Kangxian to the Lueyang-Mianxian area, then traverses the Bashan arcuate structure eastward to the Huashan region, and finally to the Qingshuihe area of the southern Dabie Mountains. From east to west, with a length of over 1500 km, the ophiolitic melange associations are distributed discontinuously along the suture. The rock assemblages include ophiolite, island-arc and oceanic island rock series, indicating that there existed a suture zone and a vanished paleo-ocean basin. The Mianliie paleo-ocean basin experienced its main expansion and formation process during the Carboniferous-Permian and closed totally in the Triassic. It belongs to the northern branch of the eastern paleotethys, separated from the northern margin of the Yangtze block under the paleotethys mantle dynamic system.The Mianlue suture extends from Derni-Nanping-Pipasi-Kangxian to the Lueyang-Mianxian area, then traverses the Bashan arcuate structure eastward to the Huashan region, and finally to the Qingshuihe area of the southern Dabie Mountains. From east to west, with a length of over 1500 km, the ophiolitic melange associations are distributed discontinuously along the suture. The rock assemblages include ophiolite, island-arc and oceanic island rock series, indicating that there existed a suture zone and a vanished paleo-ocean basin. The Mianliie paleo-ocean basin experienced its main expansion and formation process during the Carboniferous-Permian and closed totally in the Triassic. It belongs to the northern branch of the eastern paleotethys, separated from the northern margin of the Yangtze block under the paleotethys mantle dynamic system.

关 键 词：ophiolite volcanic rocks geochemistry Mianliie suture southern Qinling TETHYS 

分 类 号：P596[天文地球—地球化学] P588.14[天文地球—地质学]