Ultra-depleted melt product preserved in the Ladong ophiolitic peridotites of the North Qilian Orogenic Belt, Northern Tibet
文献类型：期刊论文
| 作者 | Zhou, Xiang2,3; Zheng, Jian-Ping3; Huang, Zeng-Bao1; Li, Zhi-Yong5; Zhang, Wei-Qi2,4; Zheng, Hong -Da3; Xiong, Qing3; Dai, Hong-Kun3 |
| 刊名 | LITHOS
 |
| 出版日期 | 2023 |
| 卷号 | 436-437页码:13 |
| ISSN号 | 0024-4937 |
| 关键词 | Ophiolitic peridotite Subduction Ultra-depleted melt Wehrlite Olivine websterite North Qilian Orogenic Belt |
| DOI | 10.1016/j.lithos.2022.106985 |
| 英文摘要 | In Earths upper mantle, the compositions of both migrating magmas and solid residues are basically controlled by source materials and melting behavior which are related to tectonic dynamics. Thus, infrequent geochemical signatures recorded by ophiolitic lithologies may reflect a unique source or specific melting history. Here, we report whole-rock and mineral compositions of the harzburgite, wehrlite, and olivine websterite in the Ladong ophiolite complex of the North Qilian Orogen Belt (northern Tibet). The dominant spinel harzburgite has high spinel Cr# values of 65-70 and light rare earth element (LREE) depleted patterns (LaN/YbN = 0.04-0.12), resembling the residua after 20% or more of melt extraction. Wehrlite lenses within the harzburgite display extremely depleted LREE patterns (whole-rock LaN/YbN = 0.04-0.05) and low Na and Ti contents in clinopyr-oxene. They are interpreted as products of reaction between the host harzburgite and an ultra-depleted melt produced by asthenospheric decompression melting. Outcrops of olivine websterite have well-equilibrated triple junction textures between pyroxene grains and high-Mg olivine (Fo = 85-86; bulk rock Mg# = 93), consistent with a cumulate origin. In the olivine websterite, the depleted LREE concentrations (LaN/YbN = 0.05-0.18) in clinopyroxene suggest a less depleted nature than the wehrlite-forming melt. Thus, the Ladong ophiolite records two episodes of melt activity that produced depleted to ultra-depleted magmas, which may have been generated during subduction initiation in eastern Proto-Tethyan belt. |
| WOS关键词 | BACK-ARC BASIN ; SUBDUCTION ZONE ; MANTLE INTERACTION ; TRANSITION ZONE ; TRACE-ELEMENT ; ABYSSAL ; ORIGIN ; XENOLITHS ; COMPLEX ; CRYSTALLIZATION |
| 资助项目 | NSFC ; [42003027] ; [41930215] ; [41504053] |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000907865300001 |
| 资助机构 | NSFC ; NSFC ; NSFC ; NSFC ; NSFC ; NSFC ; NSFC ; NSFC |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/106908]  |
| 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 | Zheng, Jian-Ping |
| 作者单位 | 1.Geol Survey Gansu Prov, Lanzhou 735000, Peoples R China 2.Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA USA 3.China Univ Geosci, Sch Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China 5.China Univ Geosci, Sch Geophys & Geomatics, Hubei Subsurface Multiscale Imaging Key Lab, Wuhan 430074, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhou, Xiang,Zheng, Jian-Ping,Huang, Zeng-Bao,et al. Ultra-depleted melt product preserved in the Ladong ophiolitic peridotites of the North Qilian Orogenic Belt, Northern Tibet[J]. LITHOS,2023,436-437:13. |
| APA | Zhou, Xiang.,Zheng, Jian-Ping.,Huang, Zeng-Bao.,Li, Zhi-Yong.,Zhang, Wei-Qi.,...&Dai, Hong-Kun.(2023).Ultra-depleted melt product preserved in the Ladong ophiolitic peridotites of the North Qilian Orogenic Belt, Northern Tibet.LITHOS,436-437,13. |
| MLA | Zhou, Xiang,et al."Ultra-depleted melt product preserved in the Ladong ophiolitic peridotites of the North Qilian Orogenic Belt, Northern Tibet".LITHOS 436-437(2023):13. |
入库方式： OAI收割
来源：地质与地球物理研究所
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