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New U-Pb zircon and geochemical constraints on Late Devonian Back-arc basin origin of eclogite protoliths from northeastern Hainan Island, South China

文献类型：期刊论文

作者Xia, Mengmeng1,4; Liu, Xiaochun1,2,4; Chen, Yi3; Hu, Juan1,4; Zheng, Guanggao1,4; Chen, Longyao1,4; Han, Jianen1,4; Hu, Daogong1
刊名LITHOS
出版日期2022-06-01
卷号418页码:14
关键词Late Devonian Eclogite protolith Mature back-arc basin Hainan Island Paleo-Tethys
ISSN号0024-4937
DOI10.1016/j.lithos.2022.106677
英文摘要Geochronological, geochemical, and Sr-Nd isotopic data are used to constrain the age, origin, and tectonic setting of the protoliths of newly discovered eclogites from Chaotanbi, northeastern Hainan Island, South China. New sensitive high-resolution ion microprobe (SHRIMP) U-Pb zircon dating reveals that the protoliths of the Chaotanbi eclogites formed at 364 +/- 2 Ma and were metamorphosed at 297 +/- 1 Ma. All samples collected from a coherent area of -1.8 km2 in the intertidal and subtidal zones on the island exhibit tholeiitic compositions, with initial 87Sr/86Sr and epsilon Nd values of 0.705-0.707 and - 1.1 to +7.4, respectively. The samples can be further categorized into three groups based on incompatible trace elements. Group #1 samples have a normal mid-ocean ridge basalt (N-MORB) affinity and were originated from relatively high-degree partial melting of a depleted spinel lherzolite mantle source slightly modified by slab-derived fluids. Group #2 samples have an enriched midocean ridge basalt (E-MORB) affinity and were derived from an enriched spinel and spinel-garnet lherzolite transition mantle source at depths greater than that of Group #1. Group #3 samples have an island arc basalt (IAB) affinity and were generated by partial melting of an enriched spinel-garnet lherzolite mantle source modified by fluid- and sediment-related recycled components. The association of these diverse basalt types, with MORB-type samples accounting for -90% of all samples, suggest a Late Devonian mature back-arc basin existed on northeastern Hainan Island, as a part of the Jinshajiang-Ailaoshan-Song Ma-Hainan back-arc basin system. Therefore, the Chaotanbi eclogites are a fingerprint of the opening and closure of the eastern Paleo-Tethyan Ocean.
WOS关键词MA SUTURE ZONE ; ND ISOTOPIC CHARACTERISTICS ; PLATE TECTONIC CYCLE ; PALEO-TETHYS OROGEN ; VOLCANIC-ROCKS ; CONTINENTAL-CRUST ; TRACE-ELEMENT ; TUNCHANG AREA ; MAGMA SOURCE ; OPHIOLITE
资助项目National Natural Science Foundation of China[41972068] ; Geological Investigation Project of China Geological Survey[DD20190306]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000798856700002
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Geological Investigation Project of China Geological Survey ; Geological Investigation Project of China Geological Survey ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Geological Investigation Project of China Geological Survey ; Geological Investigation Project of China Geological Survey ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Geological Investigation Project of China Geological Survey ; Geological Investigation Project of China Geological Survey ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Geological Investigation Project of China Geological Survey ; Geological Investigation Project of China Geological Survey
源URL[http://ir.iggcas.ac.cn/handle/132A11/105980]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Liu, Xiaochun
作者单位1.Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China
2.Chinese Acad Geol Sci, Inst Geomech, 11 Minzudaxue Nanlu, Beijing 100081, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
4.Minist Nat Resources, Lab Paleomagnetism & Tecton Reconstruct, Beijing 100081, Peoples R China
推荐引用方式
GB/T 7714		 Xia, Mengmeng,Liu, Xiaochun,Chen, Yi,et al. New U-Pb zircon and geochemical constraints on Late Devonian Back-arc basin origin of eclogite protoliths from northeastern Hainan Island, South China[J]. LITHOS,2022,418:14.
APA Xia, Mengmeng.,Liu, Xiaochun.,Chen, Yi.,Hu, Juan.,Zheng, Guanggao.,...&Hu, Daogong.(2022).New U-Pb zircon and geochemical constraints on Late Devonian Back-arc basin origin of eclogite protoliths from northeastern Hainan Island, South China.LITHOS,418,14.
MLA Xia, Mengmeng,et al."New U-Pb zircon and geochemical constraints on Late Devonian Back-arc basin origin of eclogite protoliths from northeastern Hainan Island, South China".LITHOS 418(2022):14.

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来源：地质与地球物理研究所

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