Origins of the meta-mafic rocks in the southern Dunhuang Block (NW China): Implication for tectonic framework of the southernmost Central Asian Orogenic Belt
文献类型：期刊论文
| 作者 | Shi, Mengyan3; Hou, Quanlin1; Wu, Chunming1; Yan, Quanren1; Cheng, Nannan3; Zhang, Qian W. L.1; Wang, Hao Y. C.2 |
| 刊名 | GEOLOGICAL JOURNAL
 |
| 出版日期 | 2021-04-11 |
| 页码 | 15 |
| ISSN号 | 0072-1050 |
| 关键词 | Central Asian Orogenic Belt Dunhuang Block meta‐ mafic rocks subduction– accretion complex |
| DOI | 10.1002/gj.4144 |
| 英文摘要 | The Central Asian Orogenic Belt (CAOB) is one of the largest accretionary orogenic collages in the world with prominent juvenile crust addition, where the southernmost margin of the CAOB located is one hot topic in the international studies. The Dunhuang Block located to the south of the Beishan Orogen is a key position for outlining the tectonic framework of the south margin of the CAOB. However, at present, the tectonic attribution of the Dunhuang Block is still controversial. In this paper, we focus on the origins and protoliths of the meta-mafic rocks from the Hongliuxia complex in the southern Dunhuang Block for determining the tectonic attribution of the Dunhuang Block. In the field, the meta-mafic rocks are mainly exposed as tectonic blocks within the metasedimentary rocks displaying the "block-in-matrix" fabrics or as tectonic slices juxtaposed by faults. Geochemically, the meta-mafic rocks could be divided into three groups based on the rare earth elements (REE) and trace elements: the group 1 samples are depleted in the LREE relative to HREE and show flat HREE patterns, similar to the mid-oceanic ridge basalt; the group 2 samples show flat REE patterns without obvious differentiation between the LREE and HREE, like the oceanic plateau basalt; the group 3 samples are enriched in LREE relative to LREE, and have negative Nb, Ta, and Ti anomalies, similar to the island arc basalt. Conclusively, the protoliths of the meta-mafic rocks dominantly belong to the oceanic plate components. They were metamorphosed during Early Silurian to Middle Devonian in different depths of the subduction zone documented in previous studies. So, we suggest the Hongliuxia complex is an exhumed Palaeozoic subduction-accretion complex (SAC) formed during the oceanic plate subduction. This result confirms the Palaeozoic subduction event occurred in the Dunhuang region and indicates that the Dunhuang Block is a Palaeozoic Orogen rather than a part of Precambrian continent block. Considering the regional geology context, we speculate the Dunhuang Orogen belongs to the southernmost margin of the CAOB. |
| 资助项目 | Henan Polytechnic University[760307/018] ; Ministry of Science and Technology of the People's Republic of China[2016YFC0600401] ; National Natural Science Foundation of China[41730215] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| 出版者 | WILEY |
| WOS记录号 | WOS:000639032000001 |
| 资助机构 | Henan Polytechnic University ; Henan Polytechnic University ; Ministry of Science and Technology of the People's Republic of China ; Ministry of Science and Technology of the People's Republic of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Henan Polytechnic University ; Henan Polytechnic University ; Ministry of Science and Technology of the People's Republic of China ; Ministry of Science and Technology of the People's Republic of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Henan Polytechnic University ; Henan Polytechnic University ; Ministry of Science and Technology of the People's Republic of China ; Ministry of Science and Technology of the People's Republic of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Henan Polytechnic University ; Henan Polytechnic University ; Ministry of Science and Technology of the People's Republic of China ; Ministry of Science and Technology of the People's Republic of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/101152]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Cheng, Nannan |
| 作者单位 | 1.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China 3.Henan Polytech Univ, Sch Resources & Environm, Jiaozuo 454003, Henan, Peoples R China |
| 推荐引用方式 GB/T 7714 | Shi, Mengyan,Hou, Quanlin,Wu, Chunming,et al. Origins of the meta-mafic rocks in the southern Dunhuang Block (NW China): Implication for tectonic framework of the southernmost Central Asian Orogenic Belt[J]. GEOLOGICAL JOURNAL,2021:15. |
| APA | Shi, Mengyan.,Hou, Quanlin.,Wu, Chunming.,Yan, Quanren.,Cheng, Nannan.,...&Wang, Hao Y. C..(2021).Origins of the meta-mafic rocks in the southern Dunhuang Block (NW China): Implication for tectonic framework of the southernmost Central Asian Orogenic Belt.GEOLOGICAL JOURNAL,15. |
| MLA | Shi, Mengyan,et al."Origins of the meta-mafic rocks in the southern Dunhuang Block (NW China): Implication for tectonic framework of the southernmost Central Asian Orogenic Belt".GEOLOGICAL JOURNAL (2021):15. |
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来源：地质与地球物理研究所
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