| Geochemistry of abyssal peridotites from the super slow-spreading Southwest Indian Ridge near 65 degrees E: Implications for magma source and seawater alteration | |
| Zeng, Zhigang1; Wang, Qiaoyun1; Wang, Xiaomei1,2; Chen, Shuai1,2; Yin, Xuebo1; Li, Zhaoxue1; Zeng, ZG (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Seafloor Hydrothermal Act Lab, Qingdao 266071, Peoples R China. | |
| 2012-10-01 | |
| 发表期刊 | JOURNAL OF EARTH SYSTEM SCIENCE
 |
| ISSN | 0253-4126 |
| 卷号 | 121期号:5页码:1317-1336 |
| 文章类型 | Article |
| 摘要 | The geochemical characteristics of abyssal peridotite samples from one dredge station (27 degrees 49.74'S, 65 degrees 02.14'E, water depth 4473 m) on the super slow-spreading Southwest Indian Ridge (SWIR) near 65 degrees E were investigated. Abyssal peridotites recovered from this site were comprised mainly of lizardite, chlorite, carbonate and magnetite with minor amounts of talc, pyroxene phenocrysts and sparse olivines. Serpentinites exhibit talc veins and major serpentine derived from serpentinization with relict olivine granuloblasts. Olivine grains in serpentinites display exsolution lamellae, indicating the occurrence of talc reduction or decompression during seawater-rock interaction. Pyroxene shows clear cleavage in two directions, with clinopyroxene or orthopyroxene exsolution lamellae. By contrast, bulk rock trace element patterns of serpentinites reveal depletion in most incompatible elements, similarly to the depleted mid-ocean ridge basalt mantle composition, indicating that the SWIR peridotites originated from a depleted mantle source magma and have experienced partial melting. Meanwhile, Rb, Ba, U, Pb, Sr, Li anomalies and the Ce/Pb ratio suggest that these serpentinites have been strongly altered by seawater. |
| 关键词 | Abyssal Peridotite Magma Source Seawater Alteration Southwest Indian Ridge Near 65 Degrees e |
| 学科领域 | Geosciences, Multidisciplinary ; Multidisciplinary Sciences |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000311002300015 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/12504 |
| 专题 | 海洋地质与环境重点实验室 |
| 通讯作者 | Zeng, ZG (reprint author), Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Seafloor Hydrothermal Act Lab, Qingdao 266071, Peoples R China. |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Seafloor Hydrothermal Act Lab, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China |
| 第一作者单位 | 中国科学院海洋研究所 |
| 推荐引用方式 GB/T 7714 | Zeng, Zhigang,Wang, Qiaoyun,Wang, Xiaomei,et al. Geochemistry of abyssal peridotites from the super slow-spreading Southwest Indian Ridge near 65 degrees E: Implications for magma source and seawater alteration[J]. JOURNAL OF EARTH SYSTEM SCIENCE,2012,121(5):1317-1336. |
| APA | Zeng, Zhigang.,Wang, Qiaoyun.,Wang, Xiaomei.,Chen, Shuai.,Yin, Xuebo.,...&Zeng, ZG .(2012).Geochemistry of abyssal peridotites from the super slow-spreading Southwest Indian Ridge near 65 degrees E: Implications for magma source and seawater alteration.JOURNAL OF EARTH SYSTEM SCIENCE,121(5),1317-1336. |
| MLA | Zeng, Zhigang,et al."Geochemistry of abyssal peridotites from the super slow-spreading Southwest Indian Ridge near 65 degrees E: Implications for magma source and seawater alteration".JOURNAL OF EARTH SYSTEM SCIENCE 121.5(2012):1317-1336. |
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