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The petrogenesis and tectonic significance of the Early Cretaceous intraplate granites in eastern China: The Laoshan granite as an example

文献类型：期刊论文

作者Gao, Yajie1,2,3; Niu, Yaoling1,2,4,5; Duan, Meng1,2; Xue, Qiqi5; Sun, Pu1; Chen, Shuo1; Xiao, Yuanyuan1; Guo, Pengyuan1; Wang, Xiaohong1; Chen, Yanhong5
刊名LITHOS
出版日期2019-03-01
卷号328页码:200-211
关键词Eastern China Early Cretaceous Intra-plate Paleo-Pacific plate Basal hydration weakening
ISSN号0024-4937
DOI10.1016/j.lithos.2019.01.031
通讯作者Gao, Yajie(ocean.gao@foxmail.com) ; Niu, Yaoling(yaoling.niu@durham.ac.uk)
英文摘要The Laoshan granite is an example of the widespread intraplate granitoids of early Cretaceous age in eastern continental China. The petrogenesis of these granitoids remains in dispute and we choose the Laoshan granite as the representative case to study these granitoids. Zircons from the Laoshan granite give a crystallization age of similar to 120 Ma, which is consistent with the emplacement age of similar to 126 Ma given by the bulk-rock Rb-Sr isochron. Representative samples from the granite show a large range of major element compositional variation (e.g., SiO2/MgO = 64 to 1937), reflecting a varying degree of fractional crystallization of plagioclase, alkali feldspar, amphibole, biotite and accessory phases as observed. The samples are enriched in light rare earth elements, Rb, Th and U, but depleted in Ba and Sr with negative Eu anomalies. The high Sr-87/Sr-86 (0.7083 to 1.2265) is largely caused by variably high Rb/Sr (similar to 0.31 to 91 with an average of similar to 13) due to feldspar fractionation. The low epsilon(Nd)(t) (-13.8 to -19.5), epsilon(Hf)(t) (-14.6 to -24.4), and (Pb-206/Pb-204)(1) (16.244 to 17.304) are consistent with significant contributions of the lower continental crust to magmas parental to the Laoshan granite. The origin of the parental magmas is best understood as resulting from anatexis of the lower crust (similar to 20% - 25% partial melting of the mafic granulite) triggered by and mixed with the underplating and intruding basaltic magmas. The basaltic magmas were likely derived from melting of the thinning lithosphere being transformed into the asthenosphere as the result of "basal hydration weakening" with the water ultimately coming from dehydration of the stagnant paleo-Pacific slab in the mantle transition zone. (C) 2019 Elsevier B.V. All rights reserved.
资助项目Qingdao National Laboratory for Marine Science and Technology[2015ASKJ03] ; NSFC-Shandong Joint Fund for Marine Science Research Centers[U1606401] ; National Natural Science Foundation of China[41130314] ; National Natural Science Foundation of China[41630968] ; Chinese Academy of Sciences Innovation, China[Y42217101L] ; 111 Project[B18048]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000463308800014
出版者ELSEVIER SCIENCE BV
源URL[http://ir.qdio.ac.cn/handle/337002/161071]  
专题海洋研究所_实验海洋生物学重点实验室
通讯作者Gao, Yajie; Niu, Yaoling
作者单位1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Shandong, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Shandong, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England
5.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
推荐引用方式
GB/T 7714		 Gao, Yajie,Niu, Yaoling,Duan, Meng,et al. The petrogenesis and tectonic significance of the Early Cretaceous intraplate granites in eastern China: The Laoshan granite as an example[J]. LITHOS,2019,328:200-211.
APA Gao, Yajie.,Niu, Yaoling.,Duan, Meng.,Xue, Qiqi.,Sun, Pu.,...&Chen, Yanhong.(2019).The petrogenesis and tectonic significance of the Early Cretaceous intraplate granites in eastern China: The Laoshan granite as an example.LITHOS,328,200-211.
MLA Gao, Yajie,et al."The petrogenesis and tectonic significance of the Early Cretaceous intraplate granites in eastern China: The Laoshan granite as an example".LITHOS 328(2019):200-211.

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