Structural evolution of the Nojima fault (Awaji Island, Japan) revisited from the GSJ drill hole at Hirabayashi

Anne Marie Boullier, Koichiro Fujimoto, Hisao Ito, Tomoyuki Ohtani, Nynke Keulen, Olivier Fabbri, David Amitrano, Michel Dubois, Philippe Pezard

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

21 Citationer (Scopus)

Abstrakt

Following the Hyogoken Nanbu earthquake (January 17, 1995, Mw=7.2), three drillholes were sunk through the Nojima Fault (Awaji Island, Japan). Textural and petrographic studies of the Geological Survey of Japan (GSJ) drill cores allow recognition of two deformation episodes. The first one is older than the deposition of the Middle to Late Eocene Kobe Group, corresponds to a left-lateral movement on the Nojima fault and is expressed by pseudotachylytes, kinking of biotite crystals in the low-strain rocks and an intense laumontite hydrothermal alteration. The second one displaces the basal unconformity of the Kobe group, corresponds to a right-lateral reverse displacement and is expressed at least by carbonate-filled hydraulic fractures and thin gouge zones. Different important deformation mechanisms are recorded by the fault rocks, but questions relating to the attribution of deformation and alteration features to one or other deformation episodes remain unresolved.

OriginalsprogEngelsk
Sider (fra-til)1233-1240
Antal sider8
TidsskriftEarth, Planets and Space
Vol/bind56
Udgave nummerSupplement 12
DOI
StatusUdgivet - dec. 2004
Udgivet eksterntJa

Programområde

  • Programområde 4: Mineralske råstoffer

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