Trace element composition of peridotites from the southern Mariana forearc: Insights into the geochemical effects of serpentinization and/or seafloor weathering

Xiaomei Wang; Zhigang Zeng; Changhua Liu; Junbing Chen; Xuebo Yin; Xiaoyuan Wang; Daigeng Chen; Guoliang Zhang; Kang Li; Shuai Chen; Hegen Ouyang

doi:10.1007/s00343-009-9252-6

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Trace element composition of peridotites from the southern Mariana forearc: Insights into the geochemical effects of serpentinization and/or seafloor weathering

OriginalPaper | Updated：2023-05-16

- Trace element composition of peridotites from the southern Mariana forearc: Insights into the geochemical effects of serpentinization and/or seafloor weathering
- Trace element composition of peridotites from the southern Mariana forearc: Insights into the geochemical effects of serpentinization and/or seafloor weathering
- 海洋湖沼学报（英文） 2009年27卷第4期页码：985-992
- Affiliations：
  
  1. Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences
  2. Graduate School of Chinese Academy of Sciences
  3. Geological Brigade of Hydrogeology and Engineering Geology Zhejiang Geological Prospecting Bureau
- Author bio：
- Funds：
  
  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), and the Special Foundation for the Eleventh Five-Year Plan of COMRA (No. DYXM-115-02-1-03).
- DOI：10.1007/s00343-009-9252-6
  中图分类号：
- 网络首发：2009-12-04，
  
  纸质出版：2009
- Accepted：
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Trace element composition of peridotites from the southern Mariana forearc: Insights into the geochemical effects of serpentinization and/or seafloor weathering[J]. 海洋湖沼学报（英文）, 2009,27(4):985-992.

Wang, X., Zeng, Z., Liu, C. et al. Trace element composition of peridotites from the southern Mariana forearc: Insights into the geochemical effects of serpentinization and/or seafloor weathering., Chin. J. Ocean. Limnol. 27, 985–992 (2009). https://doi.org/10.1007/s00343-009-9252-6
Trace element composition of peridotites from the southern Mariana forearc: Insights into the geochemical effects of serpentinization and/or seafloor weathering[J]. 海洋湖沼学报（英文）, 2009,27(4):985-992. DOI： 10.1007/s00343-009-9252-6.

Wang, X., Zeng, Z., Liu, C. et al. Trace element composition of peridotites from the southern Mariana forearc: Insights into the geochemical effects of serpentinization and/or seafloor weathering., Chin. J. Ocean. Limnol. 27, 985–992 (2009). https://doi.org/10.1007/s00343-009-9252-6 DOI：

摘要

Abstract

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

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

Sr and Li anomalies are inferred to be related to seawater and/or fluids released during dehydration of the subducting slab.

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references

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