| Geochemical and Geochronological Constraints on the Origin and Emplacement of the East Taiwan Ophiolite | |
Lin, Chiou-Ting1,2,3,4; Harris, Ron5; Sun, Wei-Dong1,2,3,4 ; Zhang, Guo-Liang1,2,4,6
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| 2019-04-01 | |
| Source Publication | GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
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| ISSN | 1525-2027 |
| Volume | 20Issue:4Pages:2110-2133 |
| Corresponding Author | Lin, Chiou-Ting(maruko1123@gmail.com) |
| Abstract | The East Taiwan Ophiolite (ETO) occurs as blocks and thrust sheets associated with the Lichi Melange in the Coastal Range of eastern Taiwan. The blocks consist of serpentinized harzburgite, serpentinite breccia, gabbro, dikes of dolerite and plagiogranite, pillow basalts, and red clay within a mud-and serpentinite-rich melange matrix. New U-Pb zircon dating of a pegmatite gabbro yields a weighted mean age of 16.65 +/- 0.20 Ma. This age is earlier than the North Luzon Arc but overlaps with the late-stage spreading of the South China Sea. ETO glassy basalt has low K2O, MgO and high CaO contents, similar to MORB. REE and trace element patterns show both N-MORB patterns with LREE depletion and E-MORB patterns with slight LREE enrichment. A few samples show slight depletion in Nb-Ta and Ti and enrichment in Rb, Ba, U and Sr, indicating a hint of subduction influence. Most ETO basalt plots within the overlapping fields of N-MORB and BABB on Ti-V, Cr-Y, Nb/Yb-Th/Yb, and Hf/3-Th-Ta discrimination diagrams. These geochemical compositions are emblematic of mid-ocean ridge or back-arc lava, like South China Sea basalt. We interpret ETO basalt and gabbro as fragments of the subducted South China Sea basement that were scrapped off and accreted to the Luzon forearc during the process of subduction initiation along the Manila Trench. Blocks of mantle material in the melange may originate from the upper plate of the arc-continent collision and were mixed with lower plate crustal material in a subduction channel now represented by the Lichi Melange. |
| DOI | 10.1029/2018GC007902 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | Natural Science Foundation of China[91328204] ; DREAM project of MOST China[2016YFC0600408] ; Chinese Academy of Sciences[XDB18020000] ; Chinese Academy of Sciences |
| WOS Research Area | Geochemistry & Geophysics |
| WOS Subject | Geochemistry & Geophysics |
| WOS ID | WOS:000473674300024 |
| Publisher | AMER GEOPHYSICAL UNION |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.qdio.ac.cn/handle/337002/161951 |
| Collection | 海洋地质与环境重点实验室 深海极端环境与生命过程研究中心 |
| Corresponding Author | Lin, Chiou-Ting |
| Affiliation | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Shandong, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao, Shandong, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao, Shandong, Peoples R China 4.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Shandong, Peoples R China 5.Brigham Young Univ, Dept Geol, Provo, UT 84602 USA 6.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Shandong, Peoples R China |
| First Author Affilication | Institute of Oceanology, Chinese Academy of Sciences; Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res |
| Corresponding Author Affilication | Institute of Oceanology, Chinese Academy of Sciences; Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res |
| Recommended Citation GB/T 7714 | Lin, Chiou-Ting,Harris, Ron,Sun, Wei-Dong,et al. Geochemical and Geochronological Constraints on the Origin and Emplacement of the East Taiwan Ophiolite[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2019,20(4):2110-2133. |
| APA | Lin, Chiou-Ting,Harris, Ron,Sun, Wei-Dong,&Zhang, Guo-Liang.(2019).Geochemical and Geochronological Constraints on the Origin and Emplacement of the East Taiwan Ophiolite.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,20(4),2110-2133. |
| MLA | Lin, Chiou-Ting,et al."Geochemical and Geochronological Constraints on the Origin and Emplacement of the East Taiwan Ophiolite".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 20.4(2019):2110-2133. |
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