Institutional Repository of State Key Laboratory of Lithospheric Evolution
| Ultra-depleted melt product preserved in the Ladong ophiolitic peridotites of the North Qilian Orogenic Belt, Northern Tibet | |
| Zhou, Xiang1,2; Zheng, Jian-Ping1; Huang, Zeng-Bao3; Li, Zhi-Yong4; Zhang, Wei-Qi2,5; Zheng, Hong -Da1; Xiong, Qing1; Dai, Hong-Kun1 | |
| 2023 | |
| Source Publication | LITHOS
 |
| ISSN | 0024-4937 |
| Volume | 436-437Pages:13 |
| Abstract | 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. |
| Keyword | Ophiolitic peridotite Subduction Ultra-depleted melt Wehrlite Olivine websterite North Qilian Orogenic Belt |
| DOI | 10.1016/j.lithos.2022.106985 |
| Funding Organization | NSFC ; NSFC ; NSFC ; NSFC ; NSFC ; NSFC ; NSFC ; NSFC |
| WOS Keyword | BACK-ARC BASIN ; SUBDUCTION ZONE ; MANTLE INTERACTION ; TRANSITION ZONE ; TRACE-ELEMENT ; ABYSSAL ; ORIGIN ; XENOLITHS ; COMPLEX ; CRYSTALLIZATION |
| Language | 英语 |
| Funding Project | NSFC ; [42003027] ; [41930215] ; [41504053] |
| Funding Organization | NSFC ; NSFC ; NSFC ; NSFC ; NSFC ; NSFC ; NSFC ; NSFC |
| WOS Research Area | Geochemistry & Geophysics ; Mineralogy |
| WOS Subject | Geochemistry & Geophysics ; Mineralogy |
| WOS ID | WOS:000907865300001 |
| Publisher | ELSEVIER |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.iggcas.ac.cn/handle/132A11/106908 |
| Collection | 岩石圈演化国家重点实验室 |
| Corresponding Author | Zheng, Jian-Ping |
| Affiliation | 1.China Univ Geosci, Sch Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China 2.Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA USA 3.Geol Survey Gansu Prov, Lanzhou 735000, Peoples R China 4.China Univ Geosci, Sch Geophys & Geomatics, Hubei Subsurface Multiscale Imaging Key Lab, Wuhan 430074, Peoples R China 5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China |
| Recommended Citation 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. |
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