Institutional Repository of State Key Laboratory of Lithospheric Evolution
| Compositions of cumulates in lower oceanic crust and implications for ophiolite studies | |
| Zhang WeiQi1; Liu ChuanZhou1,2,3; Liu Tong1 | |
| 2022-06-01 | |
| Source Publication | ACTA PETROLOGICA SINICA
 |
| ISSN | 1000-0569 |
| Volume | 38Issue:6Pages:1630-1654 |
| Abstract | Lower oceanic crust is the essential component of oceanic lithosphere and ophiolite and is, thus, critical to the studies on the evolution of mid-ocean ridge and supra-subduction zone and the origin of ophiolite. Here, we summarize the lithological and geochemical compositions of the lower oceanic crustal cumulates to build up the proxies for tectonic setting discriminations. In Pearce diagrams, both mid-ocean ridge and subduction-related lower oceanic crustal cumulates contrast with the corresponding lavas indicating that Pearce diagrams cannot be applied in the cumulates. The cumulates formed at different environments exhibit contrasting features of lithological associations, crystallization sequence and geochemistry. Most mid-ocean ridge and back-arc basin cumulates are nearly identical, implying they were formed by the low-pressure fractional crystallization of water-poor MORB-like melts. Cumulates from DSDP 334 drilling hole at Mid-Atlantic Ridge are similar to forearc cumulates, representing the product of re-melting or assimilation of altered mantle. The petrological and geochemical characteristics of forearc cumulates are compatible with the low-pressure fractional crystallization of a hydrous, Si-rich and depleted melt. Oceanic island cumulates show features indicative of high-pressure crystallization of a relatively water-poor and enriched melt. Finally, we summarize the essential petrological and geochemical proxies for tectonic setting discriminations for the cumulates in ophiolite and then re-interpret the origin of cumulates and gabbroic veins in Xigaze ophiolite to explain the applications of oceanic cumulates in ophiolite tectonic setting discriminations. |
| Keyword | Lower oceanic crust Cumulates Mid-ocean ridge Forearc basin Back-arc basin Oceanic island Ophiolite |
| DOI | 10.18654/1000-0569/2022.06.06 |
| WOS Keyword | XIGAZE OPHIOLITE ; BASALTS ; GEOCHEMISTRY ; CHEMISTRY ; COMPLEX ; GABBROS ; ORIGIN ; TIBET |
| Language | 英语 |
| WOS Research Area | Geology |
| WOS Subject | Geology |
| WOS ID | WOS:000826244200006 |
| Publisher | SCIENCE PRESS |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.iggcas.ac.cn/handle/132A11/108450 |
| Collection | 岩石圈演化国家重点实验室 |
| Corresponding Author | Zhang WeiQi |
| Affiliation | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| First Author Affilication | State Key Laboratory of Lithospheric Evolution |
| Corresponding Author Affilication | State Key Laboratory of Lithospheric Evolution |
| Recommended Citation GB/T 7714 | Zhang WeiQi,Liu ChuanZhou,Liu Tong. Compositions of cumulates in lower oceanic crust and implications for ophiolite studies[J]. ACTA PETROLOGICA SINICA,2022,38(6):1630-1654. |
| APA | Zhang WeiQi,Liu ChuanZhou,&Liu Tong.(2022).Compositions of cumulates in lower oceanic crust and implications for ophiolite studies.ACTA PETROLOGICA SINICA,38(6),1630-1654. |
| MLA | Zhang WeiQi,et al."Compositions of cumulates in lower oceanic crust and implications for ophiolite studies".ACTA PETROLOGICA SINICA 38.6(2022):1630-1654. |
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