| 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
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| 2020-09-15 | |
| 发表期刊 | GEOCHIMICA ET COSMOCHIMICA ACTA
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| ISSN | 0016-7037 |
| 卷号 | 285页码:21-40 |
| 摘要 | The 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. |
| 关键词 | Pacific-Indian mantle boundary Neo-Tethys subduction Pb isotope Dupal anomaly Nd-Hf isotopes Philippine arc |
| DOI | 10.1016/j.gca.2020.06.024 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | Strategic 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研究方向 | Geochemistry & Geophysics |
| WOS类目 | Geochemistry & Geophysics |
| WOS记录号 | WOS:000558635600002 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 版本 | 出版稿 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/168199 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Yang, Xiaoyong; Sun, Weidong |
| 作者单位 | 1.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 |
| 第一作者单位 | 中国科学院海洋研究所 |
| 通讯作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 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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| Early cretaceous tra（2293KB） | 期刊论文 | 作者接受稿 | 限制开放 | CC BY-NC-SA | 浏览 | |
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