Compositions of cumulates in lower oceanic crust and implications for ophiolite studies
文献类型：期刊论文
| 作者 | Zhang WeiQi3; Liu ChuanZhou1,2,3; Liu Tong3 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2022-06-01 |
| 卷号 | 38期号:6页码:1630-1654 |
| ISSN号 | 1000-0569 |
| 关键词 | Lower oceanic crust Cumulates Mid-ocean ridge Forearc basin Back-arc basin Oceanic island Ophiolite |
| DOI | 10.18654/1000-0569/2022.06.06 |
| 英文摘要 | 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. |
| WOS关键词 | XIGAZE OPHIOLITE ; BASALTS ; GEOCHEMISTRY ; CHEMISTRY ; COMPLEX ; GABBROS ; ORIGIN ; TIBET |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| 出版者 | SCIENCE PRESS |
| WOS记录号 | WOS:000826244200006 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/108450]  |
| 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 | Zhang WeiQi |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：地质与地球物理研究所
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