IOCAS-IR  > 海洋地质与环境重点实验室
Early cretaceous transformation from Pacific to Neo-Tethys subduction in the SW Pacific Ocean: Constraints from Pb-Sr-Nd-Hf isotopes of the Philippine arc
Deng, Jianghong1,2,3,4; Yang, Xiaoyong4; Zartman, Robert E.1; Qi, Huasheng4; Zhang, Lipeng1,2,3; Liu, He1,2,3; Zhang, Zhao-feng5; Mastoi, Abdul Shakoor4,6; Berador, Al Emil G.7; Sun, Weidong1,2,3
2020-09-15
Source PublicationGEOCHIMICA ET COSMOCHIMICA ACTA
ISSN0016-7037
Volume285Pages:21-40
AbstractThe westward subduction of the Pacific plate interacted with the northward subduction of the eastern Neo-Tethys plate in the Early Cretaceous. However, the subduction polarities between these two plates in the Early Cretaceous is not well constrained. The proto-Philippine arc is suggested to have originated at the Pacific - Neo-Tethys intersection in the SW Pacific in the latest Jurassic - Early Cretaceous, and can provide information about the ancient interaction between these two plates. In this study, the oldest known Early Cretaceous mantle-derived arc volcanic rocks and slab-melting generated adakites occurring in the Philippine arc have been studied for Pb, Sr, Nd and Hf isotopes to discriminate the provenance of their mantle sources and/or subduction components. The 126-118 Ma Kansi island arc volcanics have Pacific-type Pb isotopes, suggesting that the subduction components in the source are mainly from the subducted Pacific plate. Their Hf-Nd isotopes give support to a mantle source that is isotopically transitional Pacific-Indian type. The formation of the Kansi volcanics dates the subduction of the Pacific plate under the transitional Pacific-Indian mantle as Early Cretaceous. The subsequent generation of the 110 Ma Kansi adakitic diorites with the similar Pacific-type Pb isotopes indicates further partial melting of the subducted Pacific plate. In contrast, the post-110 Ma Lutopan adakitic diorites have Indian-type Pb isotopes, indicating the subsequent subduction of an Indian-type oceanic slab in the eastern Neo-Tethys tectonic regime. Therefore, the proto-Philippine arc is constrained to have originated at the intersection between Indian-type and Pacific-type oceanic crusts and mantle domains. The successive generation of these Early Cretaceous arc rocks in the Philippines indicates that a transformation of the tectonic regime from southwestward Pacific subduction to northeastward subduction of the eastern Neo-Tethys plate in the SW Pacific Ocean occurred at ca. 110 Ma, due to the abrupt change in drifting direction of the Pacific plate. (C) 2020 Elsevier Ltd. All rights reserved.
KeywordPacific-Indian mantle boundary Neo-Tethys subduction Pb isotope Dupal anomaly Nd-Hf isotopes Philippine arc
DOI10.1016/j.gca.2020.06.024
Indexed BySCI
Language英语
Funding ProjectStrategic Priority Research Program of the Chinese Academy of Sciences[XDB18020102] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA22050103] ; National Natural Science Foundation of China[41673040] ; National Natural Science Foundation of China[91328204] ; National Natural Science Foundation of China[41373007] ; National Natural Science Foundation of China[4180300] ; National Key R&D Program of China[2016YFC0600404] ; China Postdoctoral Science Foundation[2015M582003] ; Fundamental Research Funds for the Central Universities
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000558635600002
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/168199
Collection海洋地质与环境重点实验室
Corresponding AuthorYang, Xiaoyong; Sun, Weidong
Affiliation1.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, CAS Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China
3.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao 266071, Peoples R China
4.Univ Sci & Technol China, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China
5.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
6.Univ Sindh, Ctr Pure & Appl Geol, Jamshoro 76080, Pakistan
7.Mines & Geosci Bur Reg VII MGB 7, Geosci Div, Mandaue 6014, Philippines
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Deng, Jianghong,Yang, Xiaoyong,Zartman, Robert E.,et al. Early cretaceous transformation from Pacific to Neo-Tethys subduction in the SW Pacific Ocean: Constraints from Pb-Sr-Nd-Hf isotopes of the Philippine arc[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2020,285:21-40.
APA Deng, Jianghong.,Yang, Xiaoyong.,Zartman, Robert E..,Qi, Huasheng.,Zhang, Lipeng.,...&Sun, Weidong.(2020).Early cretaceous transformation from Pacific to Neo-Tethys subduction in the SW Pacific Ocean: Constraints from Pb-Sr-Nd-Hf isotopes of the Philippine arc.GEOCHIMICA ET COSMOCHIMICA ACTA,285,21-40.
MLA Deng, Jianghong,et al."Early cretaceous transformation from Pacific to Neo-Tethys subduction in the SW Pacific Ocean: Constraints from Pb-Sr-Nd-Hf isotopes of the Philippine arc".GEOCHIMICA ET COSMOCHIMICA ACTA 285(2020):21-40.
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