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The petrogenesis and tectonic significance of the Early Cretaceous intraplate granites in eastern China: The Laoshan granite as an example
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
2019-03-01
Source PublicationLITHOS
ISSN0024-4937
Volume328Pages:200-211
Corresponding AuthorGao, Yajie(ocean.gao@foxmail.com) ; Niu, Yaoling(yaoling.niu@durham.ac.uk)
AbstractThe 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.
KeywordEastern China Early Cretaceous Intra-plate Paleo-Pacific plate Basal hydration weakening
DOI10.1016/j.lithos.2019.01.031
Indexed BySCI
Language英语
Funding ProjectQingdao 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 Research AreaGeochemistry & Geophysics ; Mineralogy
WOS SubjectGeochemistry & Geophysics ; Mineralogy
WOS IDWOS:000463308800014
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/161072
Collection实验海洋生物学重点实验室
Corresponding AuthorGao, Yajie; Niu, Yaoling
Affiliation1.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
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
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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