Petrogenesis of Eocene mafic and felsic magmas in the New Caledonia ophiolite: geochemistry and geochronology constraints
文献类型：期刊论文
| 作者 | Xu, Yang1,4; Liu, Chuan-Zhou1,2,3; Shi, Xue-Fa1,4; Lin, Wei2,3 |
| 刊名 | INTERNATIONAL GEOLOGY REVIEW
 |
| 出版日期 | 2021-09-19 |
| 页码 | 18 |
| 关键词 | New Caledonia ophiolite gabbro plagiogranite petrogenesis U-Pb ages Nd-Hf-O isotopes |
| ISSN号 | 0020-6814 |
| DOI | 10.1080/00206814.2021.1978111 |
| 英文摘要 | Both felsic and mafic intrusions occur in mantle peridotites of the New Caledonia ophiolite (Peridotite Nappe) and record important information regarding the magmatic evolution during subduction initiation. A systematic petrological, geochronological and geochemical study on gabbro/diorite samples from the Peridotite Nappe is performed to explore their petrogenesis. The gabbro is mainly composed of plagioclase, clinopyroxene and amphibole. Most clinopyroxene have been altered to hornblende or actinolite, whereas some amphibole with high Al2O3 (>8 wt%) and low SiO2 (<46 wt%) contents are of a magmatic origin. This suggests that the gabbro crystallized from hydrous melts. The gabbro shows depleted Sr-Nd-Hf isotope compositions, suggesting that the parental magma of the gabbro could have been derived from the depleted MORB-type mantle (DMM) asthenosphere. The gabbro zircon have delta O-18 values of +4.74-+6.63 parts per thousand, which are slightly higher than the mantle-like delta O-18 values of +5.3 +/- 0.6 parts per thousand, indicating the involvement of subduction-related fluids in their genesis. The diorite mainly consists of albite (An(1-4)) and tremolite. The felsic dikes within the New Caledonia ophiolite, including granitoids, high-Mg felsic dikes and diorites, are oceanic plagiogranites. Extremely low TiO2 contents, roughly negative correlation of Yb and SiO2 contents, REE patterns of plagiogranites and mafic rocks, and compositions of zircon suggest that the plagiogranites were not products of fractional crystallization of MORB but were generated by hydrous melting of mafic protoliths. The diorite zircon show core-rim textures. Both rims and cores yield identical U-Pb ages of 54.6 +/- 0.9 Ma vs 54.6 +/- 0.6 Ma, and no old inherited cores were identified based on significantly older dates. Our studies show zircon U-Pb ages of similar to 55 Ma for the gabbro/diorite and titanite U-Pb age of similar to 53 Ma for the gabbro, which are older than the New Caledonia CE-boninites (51-47 Ma). Therefore, the magmatic evolution of the New Caledonia ophiolite during subduction initiation has been reconstructed. |
| WOS关键词 | FORE-ARC CRUST ; SOUTHWEST PACIFIC ; OCEANIC PLAGIOGRANITES ; SUBDUCTION INITIATION ; OXYGEN ISOTOPES ; MELT EXTRACTION ; SUD OPHIOLITE ; POYA TERRANE ; RIDGE ; ORIGIN |
| 资助项目 | National Natural Science Foundation of China[41902061] ; National Natural Science Foundation of China[U1606401] ; Opening Foundation of the Laboratory for Marine Geology ; Scientific Research Foundation for Young Scientist, Qingdao National Laboratory for Marine Science and Technology[MGQNLM-KF201813] ; Scientific Research Foundation for Young Scientist, Qingdao National Laboratory for Marine Science and Technology[JCZX202010] |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000698269000001 |
| 出版者 | TAYLOR & FRANCIS INC |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; Opening Foundation of the Laboratory for Marine Geology ; Opening Foundation of the Laboratory for Marine Geology ; Scientific Research Foundation for Young Scientist, Qingdao National Laboratory for Marine Science and Technology ; Scientific Research Foundation for Young Scientist, Qingdao National Laboratory for Marine Science and Technology ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Opening Foundation of the Laboratory for Marine Geology ; Opening Foundation of the Laboratory for Marine Geology ; Scientific Research Foundation for Young Scientist, Qingdao National Laboratory for Marine Science and Technology ; Scientific Research Foundation for Young Scientist, Qingdao National Laboratory for Marine Science and Technology ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Opening Foundation of the Laboratory for Marine Geology ; Opening Foundation of the Laboratory for Marine Geology ; Scientific Research Foundation for Young Scientist, Qingdao National Laboratory for Marine Science and Technology ; Scientific Research Foundation for Young Scientist, Qingdao National Laboratory for Marine Science and Technology ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Opening Foundation of the Laboratory for Marine Geology ; Opening Foundation of the Laboratory for Marine Geology ; Scientific Research Foundation for Young Scientist, Qingdao National Laboratory for Marine Science and Technology ; Scientific Research Foundation for Young Scientist, Qingdao National Laboratory for Marine Science and Technology |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/102666]  |
| 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 | Xu, Yang |
| 作者单位 | 1.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China 3.Univ Chinese Acad Sci, Beijing, Peoples R China 4.Minist Nat Resources, Inst Oceanog 1, Key Lab Marine Geol & Metallogeny, Qingdao, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xu, Yang,Liu, Chuan-Zhou,Shi, Xue-Fa,et al. Petrogenesis of Eocene mafic and felsic magmas in the New Caledonia ophiolite: geochemistry and geochronology constraints[J]. INTERNATIONAL GEOLOGY REVIEW,2021:18. |
| APA | Xu, Yang,Liu, Chuan-Zhou,Shi, Xue-Fa,&Lin, Wei.(2021).Petrogenesis of Eocene mafic and felsic magmas in the New Caledonia ophiolite: geochemistry and geochronology constraints.INTERNATIONAL GEOLOGY REVIEW,18. |
| MLA | Xu, Yang,et al."Petrogenesis of Eocene mafic and felsic magmas in the New Caledonia ophiolite: geochemistry and geochronology constraints".INTERNATIONAL GEOLOGY REVIEW (2021):18. |
入库方式： OAI收割
来源：地质与地球物理研究所
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