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Two-stage rollbacks of the paleo-Pacific plate beneath the Cathaysia block during Cretaceous: Insights from A-type granites and volcanic rocks

文献类型：期刊论文

作者Peng, Hong-Wei5,6; Fan, Hong-Rui1,2,6; Jiang, Peng3; Hu, Huan-Long4,6; Lan, Ting-Guang2,4
刊名GONDWANA RESEARCH
出版日期2021-09-01
卷号97页码:158-175
关键词A-type Volcanic-intrusive complex Granite Cretaceous Rollback of the paleo-Pacific plate Cathaysia block
ISSN号1342-937X
DOI10.1016/j.gr.2021.05.020
英文摘要Petrogenesis and tectonic implications of the Cretaceous A-type rocks in the Cathaysia block remain controversial. We address this issue by the inland early Cretaceous (137-136 Ma) A-type Tiantangshan volcanic-intrusive complex and late Cretaceous A-type (96 Ma) Shihu-Huilong syenogranites, and integrating them with Cretaceous A-type rocks in the Cathaysia block. The Tiantangshan volcanics (trachyte-trachydacite-rhyolite) have eNd(t) (-3.5 to -2.6) and zircon eHf(t) (-3.0 to -1.3), suggesting their forming by partial melting of crust with significant addition of asthenosphere mantle-derived magma. The Tiantangshan granite, genetically connected with the volcanics, having higher eNd(t) (-1.2 to -0.8) and zircon eHf(t) (avg. 0.6) with more evolved composition, was likely formed by extensive fractional crystallization of the parental magma of the volcanics, recharged by asthenosphere-derived magma. The Shihu-Huilong syenogranites have initial 87Sr/86Sr (0.707987 to 0.708939), eNd(t) (-3.7 to -4.0) and zircon eHf(t) (avg. -1.6 to -0.6), suggesting a hybrid crustal and asthenospheric magma source. The early Cretaceous A-type rocks, distributed in the inland region with northeastward younging trend, mostly have A2 chemical features and inhomogeneous isotopic composition. However, the Tiantangshan and Baijuhuajian A-type rocks are distinct by A1 chemical subgroup and more depleted isotopic composition, likely reflective of intensified extensional back-arc environment due to slab rollback with high dipping angle. We propose an asynchronous and asymmetric rollback model during early Cretaceous that southern subducted paleo-Pacific plate started to retreat earlier than its northern part, and the rollback gradually developed northeastward. The late Cretaceous A-type granites in the coastal region, and ShihuHuilong granites, are all characterized by A1 subgroup with relatively homogeneous isotopic composition, suggesting more involvement of asthenospheric materials in magma sources, and that the coastal region was entirely under an intensified extensional back-arc environment due to slab rollback with high dipping angle. The rollback of the subducted paleo-Pacific plate during Cretaceous likely occurred as two discrete stages. (c) 2021 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
WOS关键词CRUST-MANTLE INTERACTION ; GAN-HANG BELT ; U-PB ISOTOPE ; SOUTH CHINA ; SE CHINA ; SOUTHEASTERN CHINA ; GEOCHEMICAL CHARACTERISTICS ; TECTONIC SIGNIFICANCE ; INTRUSIVE COMPLEX ; EASTERN GUANGDONG
资助项目National Key Research and Development Program of China[2017YFC0602302] ; Key Research Program of the Institute of Geology and Geophysics, CAS[IGGCAS201902]
WOS研究方向Geology
语种英语
WOS记录号WOS:000671547600005
出版者ELSEVIER
资助机构National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS ; Key Research Program of the Institute of Geology and Geophysics, CAS
源URL[http://ir.iggcas.ac.cn/handle/132A11/101993]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Fan, Hong-Rui
作者单位1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
3.Univ Florida, Dept Geol Sci, Gainesville, FL 32611 USA
4.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550081, Peoples R China
5.Cent South Univ, Sch Geosci & Info Phys, Changsha 410012, Peoples R China
6.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Peng, Hong-Wei,Fan, Hong-Rui,Jiang, Peng,et al. Two-stage rollbacks of the paleo-Pacific plate beneath the Cathaysia block during Cretaceous: Insights from A-type granites and volcanic rocks[J]. GONDWANA RESEARCH,2021,97:158-175.
APA Peng, Hong-Wei,Fan, Hong-Rui,Jiang, Peng,Hu, Huan-Long,&Lan, Ting-Guang.(2021).Two-stage rollbacks of the paleo-Pacific plate beneath the Cathaysia block during Cretaceous: Insights from A-type granites and volcanic rocks.GONDWANA RESEARCH,97,158-175.
MLA Peng, Hong-Wei,et al."Two-stage rollbacks of the paleo-Pacific plate beneath the Cathaysia block during Cretaceous: Insights from A-type granites and volcanic rocks".GONDWANA RESEARCH 97(2021):158-175.

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来源：地质与地球物理研究所

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