A new source of water in seismogenic subduction zones

Jun Kameda, Asuka Yamaguchi, Saneatsu Saito, Hiroshi Sakuma, Katsuyuki Kawamura, Gaku Kimura

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Seismogenic plate-boundary faults at accretionary margins (e.g., the Nankai margin, southwest Japan) may occur where the uppermost part of subducting oceanic crust, composed of basaltic rocks, is in contact with the overriding plate of a lithified accretionary prism. The plate-boundary faults in ancient accretionary complexes typically record high-velocity slip under fluid-rich conditions. Although previous studies have emphasized the mechanical significance of fluids in terms of dynamic slip-weakening, the source of fluid in seismogenic subduction zones remains poorly constrained. In this work, we focus on the hydrous smectite in the uppermost oceanic crust, an alteration product of intact basalt before arrival at the trench axis. A comparison between (1) new mineralogical data on basalt drillcore recovered by Integrated Ocean Drilling Program (IODP) Expedition 322 at site C0012, a reference site for subduction input to the Nankai Trough, and (2) mineralogical data on basalt within ancient oceanic crust embedded in a fossil accretionary complex of the Shimanto Belt, southwest Japan, suggests that progressive smectite-chlorite conversion would liberate bound fluids at a rate of 0.34 to 0.65 × 10 -14 s-1 along the plate interface. This rate of fluid production appears to be more than an order of magnitude greater than that from other possible sources, including from overlying sediments via smectite-illite conversion and the expulsion of pore fluids, and may facilitate seismic slip along plate-boundary faults.

Original languageEnglish
Article numberL22306
JournalGeophysical Research Letters
Volume38
Issue number22
DOIs
Publication statusPublished - Jul 4 2012
Externally publishedYes

Fingerprint

subduction zone
fluid
fluids
montmorillonite
plate boundary
basalt
smectite
oceanic crust
water
crusts
slip
margins
Japan
expeditions
illite
expulsion
fossils
accretionary prism
drilling
troughs

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Geophysics

Cite this

Kameda, J., Yamaguchi, A., Saito, S., Sakuma, H., Kawamura, K., & Kimura, G. (2012). A new source of water in seismogenic subduction zones. Geophysical Research Letters, 38(22), [L22306]. https://doi.org/10.1029/2011GL048883

A new source of water in seismogenic subduction zones. / Kameda, Jun; Yamaguchi, Asuka; Saito, Saneatsu; Sakuma, Hiroshi; Kawamura, Katsuyuki; Kimura, Gaku.

In: Geophysical Research Letters, Vol. 38, No. 22, L22306, 04.07.2012.

Research output: Contribution to journalArticle

Kameda, J, Yamaguchi, A, Saito, S, Sakuma, H, Kawamura, K & Kimura, G 2012, 'A new source of water in seismogenic subduction zones', Geophysical Research Letters, vol. 38, no. 22, L22306. https://doi.org/10.1029/2011GL048883
Kameda J, Yamaguchi A, Saito S, Sakuma H, Kawamura K, Kimura G. A new source of water in seismogenic subduction zones. Geophysical Research Letters. 2012 Jul 4;38(22). L22306. https://doi.org/10.1029/2011GL048883
Kameda, Jun ; Yamaguchi, Asuka ; Saito, Saneatsu ; Sakuma, Hiroshi ; Kawamura, Katsuyuki ; Kimura, Gaku. / A new source of water in seismogenic subduction zones. In: Geophysical Research Letters. 2012 ; Vol. 38, No. 22.
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