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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

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 emplacem... Full description

Journal Title: Chinese Journal of Oceanology and Limnology 2009, Vol.27(4), pp.985-992
Main Author: Wang, Xiaomei
Other Authors: Zeng, Zhigang , Liu, Changhua , Chen, Junbing , Yin, Xuebo , Wang, Xiaoyuan , Chen, Daigeng , Zhang, Guoliang , Li, Kang , Chen, Shuai , Ouyang, Hegen
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0254-4059 ; E-ISSN: 1993-5005 ; DOI: 10.1007/s00343-009-9252-6
Link: http://dx.doi.org/10.1007/s00343-009-9252-6
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recordid: springer_jour10.1007/s00343-009-9252-6
title: Trace element composition of peridotites from the southern Mariana forearc: Insights into the geochemical effects of serpentinization and/or seafloor weathering
format: Article
creator:
  • Wang, Xiaomei
  • Zeng, Zhigang
  • Liu, Changhua
  • Chen, Junbing
  • Yin, Xuebo
  • Wang, Xiaoyuan
  • Chen, Daigeng
  • Zhang, Guoliang
  • Li, Kang
  • Chen, Shuai
  • Ouyang, Hegen
subjects:
  • peridotites
  • forearc
  • Mariana
  • element
  • negative Ce anomaly
ispartof: Chinese Journal of Oceanology and Limnology, 2009, Vol.27(4), pp.985-992
description: 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.
language: eng
source:
identifier: ISSN: 0254-4059 ; E-ISSN: 1993-5005 ; DOI: 10.1007/s00343-009-9252-6
fulltext: no_fulltext
issn:
  • 1993-5005
  • 19935005
  • 0254-4059
  • 02544059
url: Link


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titleTrace element composition of peridotites from the southern Mariana forearc: Insights into the geochemical effects of serpentinization and/or seafloor weathering
creatorWang, Xiaomei ; Zeng, Zhigang ; Liu, Changhua ; Chen, Junbing ; Yin, Xuebo ; Wang, Xiaoyuan ; Chen, Daigeng ; Zhang, Guoliang ; Li, Kang ; Chen, Shuai ; Ouyang, Hegen
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descriptionPeridotites 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.
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titleTrace element composition of peridotites from the southern Mariana forearc: Insights into the geochemical effects of serpentinization and/or seafloor weathering
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abstractPeridotites 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.
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doi10.1007/s00343-009-9252-6
pages985-992
date2009-11