Trace element composition of peridotites from the southern Mariana forearc:Insights into the geochemical effects of serpentinization and/or seafloor weathering
文献类型：CNKI期刊论文
| 作者 | Wang XM(汪小妹); Ceng ZG(曾志刚) ; Liu ZH(刘长华); Chen JB(陈俊兵); Yin XB(殷学博); Wang XY(王晓媛); Chen DG(陈代庚); Zhang GL(张国良); Li K(李康); Chen S(陈帅)
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| 发表日期 | 2009-11-15 |
| 出处 | Chinese Journal of Oceanology and Limnology
 |
| 关键词 | peridotites forearc Mariana element negative Ce anomaly |
| 英文摘要 | 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. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | Supported by the Pilot Project of Knowledge Innovation Project,Chinese Academy of Sciences (Nos.KZCX2-YW-211, KZCX3-SW-223) ; the National Natural Science Foundation of China (No.40830849) ; the Special Foundation for the Eleventh Five-Year Plan of COMRA (No.DYXM-115-02-1-03) |
| 卷 | v.27期:04页:291-298 |
| 语种 | 英文; |
| 分类号 | P588.125 |
| ISSN号 | 0254-4059 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/192376]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.GraduateSchoolofChineseAcademyofSciences 2.KeyLaboratoryofMarineGeologyandEnvironment,InstituteofOceanology,ChineseAcademyofSciences 3.GeologicalBrigadeofHydrogeologyandEngineeringGeology,ZhejiangGeologicalProspectingBureau |
| 推荐引用方式 GB/T 7714 | Wang XM,Ceng ZG,Liu ZH,et al. Trace element composition of peridotites from the southern Mariana forearc:Insights into the geochemical effects of serpentinization and/or seafloor weathering. 2009. |
入库方式： OAI收割
来源：海洋研究所
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