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New constraints on the Cretaceous geodynamics of paleo-Pacific plate subduction: Insights from the Xiaojiang-Beizhang granitoids, Zhejiang Province, southeast China
Liang Liu;  Rui-Zhong Hu;   Hong Zhong;  Yan-Wen Tang;  Jie-Hua Yang;  Zhen Li;  Jiao-Long Zhao;  Neng-Ping Shen
2018
Source PublicationLithos
Volume314Pages:382-399
Abstract

The relationship between the evolution of Cretaceous magmatism along the southeastern margin of Eurasia and subduction of the paleo-Pacific plate remains controversial. Here we investigate the petrogenesis of the Xiaojiang-Beizhang ferroan and magnesian granitoids, melanocratic microgranular enclaves (MME) that are found within the granitoids, and an associated mafic dyke exposed in southeast China to provide new constraints on the geodynamics of paleo-Pacific plate subduction. Zircon U-Pb ages indicate that the ferroan and magnesian granitoids were emplaced in the Cretaceous (ca. 120 and 110 Ma, respectively), and that the MME and mafic dyke are coeval with their host granitoids. Geochemical characteristics imply that the granitoids were produced by partial melting of crustal rocks and mixed with mantle-derived magmas. The MME are derivatives of the mafic magmas that intruded the silicic magmas. Two phases of mafic magmatism are evident. Stage 1 mafic rocks (the ca. 120 Ma MME) were derived mainly from the subcontinental lithospheric mantle (SCLM) with some contribution from asthenospheric mantle. The parental mafic magmas for Stage 2 (the ca. 110 Ma MME and mafic dykes) were derived from interaction and metasomatism of the SCLM and asthenosphere with slab-derived fluids. Iron enrichment or depletion in the granitoids was controlled mainly by oxygen fugacity and pressure. Our new data, combined with previously published data from Cretaceous igneous rocks in southeastern China, reveal major geochemical changes at 136 and 118 Ma, respectively. The 132-119 Ma igneous rocks record the minimal addition of slab-derived components to their source, and provide strong evidence for an abrupt change in the direction of motion of the paleo-Pacific plate from southwest to northwest at ca. 125-122 Ma.

KeywordFerroan And Magnesian Granitoids Mafic Microgranular Enclaves Magma Mixing/mingling Paleo-pacific Plate Subduction Southeast China
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8861
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.College of Earth Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
3.John de Laeter Centre, Faculty of Science and Engineering, Curtin University, GPO Box U1987, Perth, WA 6845, Australia
4.School of Earth Sciences, Gansu Key Laboratory of Mineral Resources in Western China, Lanzhou University, Lanzhou 730000, China
Recommended Citation
GB/T 7714
Liang Liu;Rui-Zhong Hu; Hong Zhong;Yan-Wen Tang;Jie-Hua Yang;Zhen Li;Jiao-Long Zhao;Neng-Ping Shen. New constraints on the Cretaceous geodynamics of paleo-Pacific plate subduction: Insights from the Xiaojiang-Beizhang granitoids, Zhejiang Province, southeast China[J]. Lithos,2018,314:382-399.
APA Liang Liu;Rui-Zhong Hu; Hong Zhong;Yan-Wen Tang;Jie-Hua Yang;Zhen Li;Jiao-Long Zhao;Neng-Ping Shen.(2018).New constraints on the Cretaceous geodynamics of paleo-Pacific plate subduction: Insights from the Xiaojiang-Beizhang granitoids, Zhejiang Province, southeast China.Lithos,314,382-399.
MLA Liang Liu;Rui-Zhong Hu; Hong Zhong;Yan-Wen Tang;Jie-Hua Yang;Zhen Li;Jiao-Long Zhao;Neng-Ping Shen."New constraints on the Cretaceous geodynamics of paleo-Pacific plate subduction: Insights from the Xiaojiang-Beizhang granitoids, Zhejiang Province, southeast China".Lithos 314(2018):382-399.
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