Age of Anzishan granulites in the Mianxian-Lueyang suture zone of Qingling orogen:With a discussion of the timing of final assembly of Yangtze and North China craton blocks

作     者：ZHANG Zongqing ZHANG Guowei TANG SuohaiV XU Jifeng YANG Yongcheng WANG Jinhui 

作者机构：Institute of GeologyChinese Academy of GeosciencesBeijing 100037China Department of GeologyNorthwest UniversityXi’an 710069China Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China Shaanxi Institute of Regional Geology and Mineral ResourcesXian-yang 712000China 

出 版 物：《Chinese Science Bulletin》 (CHINESE SCIENCE BULLETIN)

年 卷 期：2002年第47卷第22期

页      面：1925-1930页

核心收录：

学科分类：0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 

基　　金：The work was supported by the National Natural Science Foundation of China(Grant Nos.40072071and 49732080) 

主　　题：isotope geochronology granulite Qinling orogen. 

摘      要：Many granulite blocks have been recently dis-covered in the Anzishan area, Mianxian County, ShaanxiProvince, in the central segment of the Manxian-Lueyangsuturc zone. Sm-Nd isochron and 40 Ar39 Ar ages of mineralsamples of granulites from this area are reported in the *** granulite mineral samples give a Sm-Nd isochron age oft=(206 ± 55) Ma (2σ), with INd = 0.51302±7(2σ) and MSWD =1.6, and a biotite 40Ar/39 Ar plateau age of (199.7±l.7) Ma(2σ). The formation and uplift of the granulites were relatedto subduction of the Yangtze block beneath the SouthQinling microcontinent and their collision and the finalamalgamation of the Yangtze and Sino-Korean craton blocksin the Indosinian, and their age is consistent with or close tothose of the Dabie ultrahigh-pressure and high-pressuremetamorphic rocks, so have great tectonic significance.