Timming of Lithospheric Extension in Northeastern China:Evidence from the Late Mesozoic Nianzishan A-Type Granitoid Complex

作     者：Jinhua Qin Cui Liu Yuchuan Chen Jinfu Deng 

作者机构：MNR Key Laboratory of Metallogeny and Mineral AssessmentInstitute of Mineral ResourcesCAGSBeijing 100037China School of Earth Sciences and ResourcesChina University of GeosciencesBeijing 100083China 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2019年第30卷第4期

页      面：689-706页

核心收录：

学科分类：07[理学] 0708[理学-地球物理学] 0704[理学-天文学] 

基　　金：funded by the China Geological Survey (Nos. DD20160123 (DD-16-049, D1522), DD20160346, 1212011121075, 212010911028, 12120114020901) the National Natural Science Foundation of China (No.NSFC40802020) 

主　　题：AA-type granitee new zircon UU-Pb zircon agees NE China lithospheric exxtension 

摘      要：New zircon U-Pb dates obtained by laser ablation inductively coupled plasma mass spectrometry（LA-ICP-MS）,whole-rock geochemical data and Sm-Nd and Rb-Sr isotopic data are presented for miarolitic alkaline granites,porphyritic syenite and rhyolites of the Nianzishan A-type granitoid complex（NAGC）in the Great Xing’an Range-Songliao Basin in Northeast（NE）*** crystallization ages of 112.95±0.93 and 114.1±1.71 Ma for granite and 118.6±0.51 Ma for porphyritic syenite were determined by high-precision *** εNd（t）of the rocks range from +1.85 to+2.06,with Nd model ages(TDM1)from 671 to 821 Ma,indicating that the NAGC originated from juvenile source rocks and exhibits geochemical characteristics of A1-and AA-type granite which formed in an extensional *** attribute the magmatism to regional extension and lithospheric thinning caused by the subduction of the western Pacific Plate about 120 to 100 Ma.