Timing and geochemical characters of the Sanchazi magmatic arc in Mianlüe tectonic zone,South Qinling

作     者：LI Shuguang1, HOU Zhenhui1, YANG Yongcheng2, SUN Weidong1,1), ZHANG Guowei3, & LI Qiuli1 1. School of Earth and Space Sciences,University of Science and Technology of China ,Hefei 230026,China 2. Regional Geological Survey Team of Shaanxi Province,Xianyang 712000, China 3. Department of Geology, Northwest University,Xi抋n 710069, China 

作者机构：School of Earth and Space Sciences University of Science and Technology of China Hefei China Regional Geological Survey Team of Shaanxi Province Xianyang China Max-Planck-Institut f. Chemie Mainz Germany Department of Geology Northwest University Xi’an China 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2004年第47卷第4期

页      面：317-328页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 07[理学] 

基　　金：This work was supported by the National Natural Science Foundationof China (Grant Nos. 494772144  40234041) 

主　　题：Qinling orogen, magmatic arc, U-Pb zircon age, ophiolite complex. 

摘      要：The Sanchazi mafic-ultramafic complex in Mianlüe tectonic zone,South Qinling can be subdivided into two blocks,*** paleo-magmatic arc and Zhuangkegou paleo-oceanic crust fragment (ophiolite).The Sanchazi paleo-magmatic arc is mainly composed of ande-site,basaltic and basalt-andesitic gabbro(or diorite),andesitic dyke,plagiogranite and minor ul-tramafric rocks,which have typical geochemical features of island arc volcanic rocks,such as high field strength element(***,Ti)depletions and lower Cr,Ni *** Light rare earth element (LREE) and K enrichments of these rocks and zircon xenocrystals of 900 Ma from plagiogranite suggest that this magmatic arc was developed on the South active continental margin of the South Qinling *** U-Pb age of (300±61) Ma for zircons from plagiogranite in-dicates that the Mianlüe paleo-oceanic crust was probably subducted underneath the South Qinling micro-continent in *** is consistent with the formation time (309Ma) of the Huwan eclogite originating form oceanic subduction in Dabie Mountains,suggesting that the Mianlüe paleo-ocean probably extended eastward to the Dabie Mountains in *** high-Mg adakitic rocks in Sanchazi paleo-magmatic arc suggest thet the subducted oceanic crust was relatively young (25Ma) and hot.