| Item type |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2017-10-03 |
| タイトル |
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タイトル |
Two types of antigorite serpentinite controlling heterogeneous slow-slip behaviours of slab-mantle interface |
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言語 |
en |
| 言語 |
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言語 |
eng |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
journal article |
| ID登録 |
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ID登録 |
10.24517/00010739 |
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ID登録タイプ |
JaLC |
| 著者 |
Mizukami, Tomoyuki
Yokoyama, Hironori
Hiramatsu, Yoshihiro
Arai, Shoji
Kawahara, Hirokazu
Nagaya, Takayoshi
Wallis, Simon R.
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| 著者別表示 |
水上, 知行
平松, 良浩
荒井, 章司
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| 書誌情報 |
Earth and Planetary Science Letters
巻 401,
p. 148-158,
発行日 2014-09-01
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| ISSN |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
0012-821X |
| NCID |
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収録物識別子タイプ |
NCID |
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収録物識別子 |
AA00631029 |
| 出版者 |
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出版者 |
Elsevier |
| 抄録 |
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内容記述タイプ |
Abstract |
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内容記述 |
It is known that plate boundaries in subduction zones show heterogeneous slip nature with strongly coupled seismogenic zones and various types of episodic tremor and slip (ETS) zones. In order to examine the petrological controls on the large-scale structure, we compared recent geophysical observations in the Shikoku area, southwest Japan with petrological models of the hanging wall mantle wedge. As a result, we found a close relationship between mineral assemblages in the mantle wedge and the characteristics of slow slip behaviour recorded in the Shikoku area: Short-term ETSs take place in the antigorite + olivine stability field and silent long-term slow slip events (SSEs) take place in the antigorite+brucite stability field. Based on observations of natural antigorite serpentinites, we propose a model that the dominant serpentinization reaction in the mantle wedge changes with increasing depth resulting in variable extents of pore fluid pressures along slip planes. The serpentinization reaction in the antigorite+brucite stability field (olivine + H2O → antigorite + brucite) proceeds at the expense of water. This is consistent with moderately elevated pore pressures inferred for long-term SSEs. The existence of weak brucite enhances the development of shear zones oblique to the main foliation. The resultant anastomosing network provides fluid pathways that may help reduce pore pressures on slip planes. In contrast, progress of the serpentinization reaction in the antigorite + olivine stability field (olivine + H2O + SiO2 → antigorite) results in a large amount of residual water that contributes to further increase pore fluid pressures on slip planes of short-term SSEs. Our results imply that understanding of serpentinization reactions and their contributions to fluid networks in mantle wedge is important in constructing quantitative 3-D models for strain evolutions along plate boundaries. © 2014 Elsevier B.V. |
| 著者版フラグ |
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出版タイプ |
AM |
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出版タイプResource |
http://purl.org/coar/version/c_ab4af688f83e57aa |
| 関連URI |
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関連タイプ |
isVersionOf |
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識別子タイプ |
DOI |
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関連識別子 |
https://doi.org/10.1016/j.epsl.2014.06.009 |
| 関連URI |
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関連タイプ |
isIdenticalTo |
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識別子タイプ |
URI |
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関連識別子 |
http://www.elsevier.com/locate/issn/0012821X |
SC-PR-MIZUKAMI-T-148.pdf (4.1 MB)
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