Late Neoarchean crustal growth under paired continental arc-back arc system in the North China Craton

作     者：Xin He Wei Wang M.Santosh Jiachen Yao Kangting Gao Yuhan Zhang Denggang Lu Lishuang Guo Xin He;Wei Wang;M.Santosh;Jiachen Yao;Kangting Gao;Yuhan Zhang;Denggang Lu;Lishuang Guo

作者机构：The State Key Laboratory of Geological Processes and Mineral ResourcesSchool of Earth Sciences and ResourcesChina University of GeosciencesBeijing 100083PR China Department of Earth SciencesUniversity of AdelaideSA 5005Australia National Institute of Natural HazardsMEMCBeijing 100085PR China 

出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)

年 卷 期：2021年第12卷第3期

页      面：437-457页

核心收录：

学科分类：070904[理学-构造地质学] 0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 0704[理学-天文学] 

基　　金：financially supported by the National Natural Science Foundation of China(Grant Nos.41530207 and 41872196) Central University Basic Scientific Research Business Expenses of China University of Geosciences(Beijing)(Grant Nos.2-9-2019-055 and 2-9-2016-006) support by the undergraduate innovation and entrepreneurship program(X201911415003) 

主　　题：Late Neoarchean metavolcanic rocks Continental growth Paired continental arc-back arc Jiaobei terrane North China Craton 

摘      要：The late Archean(~3.0-2.5 Ga)was a key period of continental growth globally,which is widely considered to reflect the onset of vigorous plate tectonic activity,although related continental growth modes remain *** we investigate a suite of late Neoarchean metavolcanic rocks from the southwest Qixia area of the Jiaobei terrane in the North China *** rocks in this suite include amphibolites,clinopyroxene amphibolites,and hornblende plagioclase *** present zircon U-Pb isotopic data which indicate that the protoliths of these rocks formed during~2549-2511 ***(clinopyroxene)amphibolites correspond to meta-basaltic rocks,with some containing high modal content of *** rocks show moderate to high FeO_(T)(8.96-13.62 wt.%)and TiO_(2)(0.59-1.59 wt.%),flat to less fractionated REE patterns,and mildly negative Th,Nb,and Ta anomalies,resembling those of *** addition,they display positive zirconε_(Hf)(t)values(+2.6 to+8.7),and are devoid of crustal contamination or fractional *** with the low Nb/Yb(mostly1.60)and(Hf/Sm)_N(mostly0.95),low to moderate Th/Yb(0.08-0.54),and low V/Sc(5.53-9.19)ratios,these basaltic rocks are interpreted to have been derived from a relatively reduced and depleted mantle source that was mildly metasomatized by hydrous *** hornblende plagioclase gneisses are meta-andesitic rocks,and occur interlayered with the basaltic *** are transitional between tholeiitic and calc-alkaline rock series,and show fractionated REE patterns with evidently negative Th,Nb,and Ta *** depleted zirconε_(Hf)(t)values(+2.4 to+8.4)and quantitative chemical modeling suggest that the andesitic rocks were most likely generated by injection and mixing of juvenile felsic magmas with the tholeiitic basaltic *** general,the chemical features and genesis of late Neoarchean meta-basaltic rocks in our study area resemble those of Mariana back-arc basin *** with regional ge