| Trace element composition of peridotites from the southern Mariana forearc: Insights into the geochemical effects of serpentinization and/or seafloor weathering | |
| Wang Xiaomei1,2; Zeng Zhigang1; Liu Changhua1; Chen Junbing3; Yin Xuebo1; Wang Xiaoyuan1; Chen Daigeng1,2; Zhang Guoliang1,2; Li Kang1,2; Chen Shuai1,2; Ouyang Hegen1,2 | |
| 2009-11-01 | |
| 发表期刊 | CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
 |
| ISSN | 0254-4059 |
| 卷号 | 27期号:4页码:985-992 |
| 文章类型 | Article |
| 摘要 | Peridotites from the southern Mariana forearc were sampled on the landward trench slope of the Izu-Bonin-Mariana (IBM) subduction zone by dredging. These mantle wedge peridotites underwent hydration by fluid derived from a dehydrated descending slab, and later interacted with seawater after emplacement at or near the seafloor. This study investigates how these two different rock-fluid interaction processes influenced trace element distribution in the southern Mariana forearc peridotites. We measured trace element concentrations of peridotites from the southern Mariana forearc. The southern Mariana forearc peridotites are characterized by a distinct seawater-like REE pattern with an obvious negative Ce anomaly, and La shows good correlation with other REEs (except Ce). In addition, there is a great enrichment of U, Pb, Sr and Li elements, which show a distinct positive anomaly relative to adjacent elements in the multi-element diagram. For the seawater-like REE pattern, we infer that REEs are mainly influenced by seawater during peridotite-seawater interactions after their emplacement at or near the seafloor, by serpentinization or by marine weathering. Furthermore, the anomalous behavior of Ce, compared with other rare earth elements in these samples, may indicate that they have undergone reactions involving Ce (IV) when the peridotites interacted with seawater. Positive U, Pb, Sr and Li anomalies are inferred to be related to seawater and/or fluids released during dehydration of the subducting slab.; Peridotites from the southern Mariana forearc were sampled on the landward trench slope of the Izu-Bonin-Mariana (IBM) subduction zone by dredging. These mantle wedge peridotites underwent hydration by fluid derived from a dehydrated descending slab, and later interacted with seawater after emplacement at or near the seafloor. This study investigates how these two different rock-fluid interaction processes influenced trace element distribution in the southern Mariana forearc peridotites. We measured trace element concentrations of peridotites from the southern Mariana forearc. The southern Mariana forearc peridotites are characterized by a distinct seawater-like REE pattern with an obvious negative Ce anomaly, and La shows good correlation with other REEs (except Ce). In addition, there is a great enrichment of U, Pb, Sr and Li elements, which show a distinct positive anomaly relative to adjacent elements in the multi-element diagram. For the seawater-like REE pattern, we infer that REEs are mainly influenced by seawater during peridotite-seawater interactions after their emplacement at or near the seafloor, by serpentinization or by marine weathering. Furthermore, the anomalous behavior of Ce, compared with other rare earth elements in these samples, may indicate that they have undergone reactions involving Ce (IV) when the peridotites interacted with seawater. Positive U, Pb, Sr and Li anomalies are inferred to be related to seawater and/or fluids released during dehydration of the subducting slab. |
| 关键词 | Peridotites Forearc Mariana Element Negative Ce Anomaly |
| 学科领域 | Limnology ; Oceanography |
| DOI | 10.1007/s00343-009-9252-6 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000272422300036 |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/3708 |
| 专题 | 海洋地质与环境重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China 3.Zhejiang Geol Prospecting Bur, Ningbo 315012, Zhejiang, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang Xiaomei,Zeng Zhigang,Liu Changhua,et al. Trace element composition of peridotites from the southern Mariana forearc: Insights into the geochemical effects of serpentinization and/or seafloor weathering[J]. CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2009,27(4):985-992. |
| APA | Wang Xiaomei.,Zeng Zhigang.,Liu Changhua.,Chen Junbing.,Yin Xuebo.,...&Ouyang Hegen.(2009).Trace element composition of peridotites from the southern Mariana forearc: Insights into the geochemical effects of serpentinization and/or seafloor weathering.CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,27(4),985-992. |
| MLA | Wang Xiaomei,et al."Trace element composition of peridotites from the southern Mariana forearc: Insights into the geochemical effects of serpentinization and/or seafloor weathering".CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY 27.4(2009):985-992. |
| 条目包含的文件 | ||||||
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