Cathodoluminescence and fluid inclusion analyses of mineral veins within major thrusts in the Shimanto accretionary complex: Evidence of hydraulic fracturing during thrusting

Hideki Mukoyoshi, Tetsuro Hirono, Kotaro Sekine, Noriyoshi Tsuchiya, Wonn Soh

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

To elucidate fluid-rock interaction in a seismogenic zone along a plate-subduction boundary, we investigated the occurrence of mineral veins within the major thrusts in the Shimanto accretionary complex and examined their microstructures using a cathodoluminescence technique. We found discriminative structures, for example, a jigsaw-puzzle structure, within the quartz veins in the thrusts, which could indicate that hydraulic fracturing occurred by abnormal pore-fluid pressure during thrusting. Pore pressure values, estimated quantitatively by fluid inclusion analyses, were 3-27 MPa higher than the surrounding parts, which may be direct evidence of abnormal pore-fluid pressure. High pore-fluid pressures and subsequent hydraulic fracturing may play an important role within major thrusts along a plate-subduction boundary.

Original languageEnglish
Pages (from-to)937-942
Number of pages6
Journalearth, planets and space
Volume59
Issue number8
DOIs
Publication statusPublished - 2007

Keywords

  • Cathodoluminescence
  • Hydraulic fracturing
  • Seismogenic zone
  • Shimanto accretionary complex

ASJC Scopus subject areas

  • Geology
  • Space and Planetary Science

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