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Talc-bearing serpentinized peridotites from the southern Mariana forearc: implications for aseismic character within subduction zones

The serpentinized peridotites overlying the subducted zones in the Izu-Bonin-Mariana (IBM) arc system have been interpret as the cause of the low-velocity layer identified beneath the IBM froearc, in turn few earthquakes occurred along the plate boundary. Chrysotile, which is a low temperature and h... Full description

Journal Title: Chinese Journal of Oceanology and Limnology 2009, Vol.27(3), pp.667-673
Main Author: Wang, Xiaomei
Other Authors: Zeng, Zhigang , Liu, Changhua , Chen, Junbing , Yin, Xuebo , Wang, Xiaoyuan , Chen, Daigeng , Zhang, Guoliang , Chen, Shuai , Li, Kang , Ouyang, Hegen
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0254-4059 ; E-ISSN: 1993-5005 ; DOI: 10.1007/s00343-009-9207-y
Link: http://dx.doi.org/10.1007/s00343-009-9207-y
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recordid: springer_jour10.1007/s00343-009-9207-y
title: Talc-bearing serpentinized peridotites from the southern Mariana forearc: implications for aseismic character within subduction zones
format: Article
creator:
  • Wang, Xiaomei
  • Zeng, Zhigang
  • Liu, Changhua
  • Chen, Junbing
  • Yin, Xuebo
  • Wang, Xiaoyuan
  • Chen, Daigeng
  • Zhang, Guoliang
  • Chen, Shuai
  • Li, Kang
  • Ouyang, Hegen
subjects:
  • talc
  • serpentinized peridotites
  • Mariana
  • aseismic subduction zone
ispartof: Chinese Journal of Oceanology and Limnology, 2009, Vol.27(3), pp.667-673
description: The serpentinized peridotites overlying the subducted zones in the Izu-Bonin-Mariana (IBM) arc system have been interpret as the cause of the low-velocity layer identified beneath the IBM froearc, in turn few earthquakes occurred along the plate boundary. Chrysotile, which is a low temperature and highly hydrated phase of serpentine with low frictional strength, has been suggested as the low velocity material in the serpentinized peridotites, besides, brucite is inferred to be likely conducive to stable sliding. However, such idea encounters challenging in our serpentinized peridotites from the southern Mariana forearc, which absent both the above minerals. The presence of talc, which characterized by its weak, low-friction and inherently stable sliding behavior, provides new clue. Here we report the occurrence of talc in serpentinized peridotites collected from the landward trench slope of the southern Mariana forearc. We infer that talc is mainly forming as a result of the reaction of serpentine minerals with silica-saturated fluids released from the subducting slab, and talc also occurs as talc veins sometimes. Due to its unique physical properties, talc may therefore play a significant role in aseismic slip in the IBM subduction zone.
language: eng
source:
identifier: ISSN: 0254-4059 ; E-ISSN: 1993-5005 ; DOI: 10.1007/s00343-009-9207-y
fulltext: no_fulltext
issn:
  • 1993-5005
  • 19935005
  • 0254-4059
  • 02544059
url: Link


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titleTalc-bearing serpentinized peridotites from the southern Mariana forearc: implications for aseismic character within subduction zones
creatorWang, Xiaomei ; Zeng, Zhigang ; Liu, Changhua ; Chen, Junbing ; Yin, Xuebo ; Wang, Xiaoyuan ; Chen, Daigeng ; Zhang, Guoliang ; Chen, Shuai ; Li, Kang ; Ouyang, Hegen
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subjecttalc ; serpentinized peridotites ; Mariana ; aseismic subduction zone
descriptionThe serpentinized peridotites overlying the subducted zones in the Izu-Bonin-Mariana (IBM) arc system have been interpret as the cause of the low-velocity layer identified beneath the IBM froearc, in turn few earthquakes occurred along the plate boundary. Chrysotile, which is a low temperature and highly hydrated phase of serpentine with low frictional strength, has been suggested as the low velocity material in the serpentinized peridotites, besides, brucite is inferred to be likely conducive to stable sliding. However, such idea encounters challenging in our serpentinized peridotites from the southern Mariana forearc, which absent both the above minerals. The presence of talc, which characterized by its weak, low-friction and inherently stable sliding behavior, provides new clue. Here we report the occurrence of talc in serpentinized peridotites collected from the landward trench slope of the southern Mariana forearc. We infer that talc is mainly forming as a result of the reaction of serpentine minerals with silica-saturated fluids released from the subducting slab, and talc also occurs as talc veins sometimes. Due to its unique physical properties, talc may therefore play a significant role in aseismic slip in the IBM subduction zone.
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titleTalc-bearing serpentinized peridotites from the southern Mariana forearc: implications for aseismic character within subduction zones
descriptionThe serpentinized peridotites overlying the subducted zones in the Izu-Bonin-Mariana (IBM) arc system have been interpret as the cause of the low-velocity layer identified beneath the IBM froearc, in turn few earthquakes occurred along the plate boundary. Chrysotile, which is a low temperature and highly hydrated phase of serpentine with low frictional strength, has been suggested as the low velocity material in the serpentinized peridotites, besides, brucite is inferred to be likely conducive to stable sliding. However, such idea encounters challenging in our serpentinized peridotites from the southern Mariana forearc, which absent both the above minerals. The presence of talc, which characterized by its weak, low-friction and inherently stable sliding behavior, provides new clue. Here we report the occurrence of talc in serpentinized peridotites collected from the landward trench slope of the southern Mariana forearc. We infer that talc is mainly forming as a result of the reaction of serpentine minerals with silica-saturated fluids released from the subducting slab, and talc also occurs as talc veins sometimes. Due to its unique physical properties, talc may therefore play a significant role in aseismic slip in the IBM subduction zone.
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abstractThe serpentinized peridotites overlying the subducted zones in the Izu-Bonin-Mariana (IBM) arc system have been interpret as the cause of the low-velocity layer identified beneath the IBM froearc, in turn few earthquakes occurred along the plate boundary. Chrysotile, which is a low temperature and highly hydrated phase of serpentine with low frictional strength, has been suggested as the low velocity material in the serpentinized peridotites, besides, brucite is inferred to be likely conducive to stable sliding. However, such idea encounters challenging in our serpentinized peridotites from the southern Mariana forearc, which absent both the above minerals. The presence of talc, which characterized by its weak, low-friction and inherently stable sliding behavior, provides new clue. Here we report the occurrence of talc in serpentinized peridotites collected from the landward trench slope of the southern Mariana forearc. We infer that talc is mainly forming as a result of the reaction of serpentine minerals with silica-saturated fluids released from the subducting slab, and talc also occurs as talc veins sometimes. Due to its unique physical properties, talc may therefore play a significant role in aseismic slip in the IBM subduction zone.
copHeidelberg
pubSP Science Press
doi10.1007/s00343-009-9207-y
pages667-673
date2009-09