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| Titel |
Earthquake fault rock indicating a coupled lubrication mechanism |
| VerfasserIn |
S. Okamoto, G. Kimura, S. Takizawa, H. Yamaguchi |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1815-381X
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| Digitales Dokument |
URL |
| Erschienen |
In: eEarth ; 1, no. 1 ; Nr. 1, no. 1 (2006-12-20), S.23-28 |
| Datensatznummer |
250000104
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| Publikation (Nr.) |
 copernicus.org/ee-1-23-2006.pdf |
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| Zusammenfassung |
| A pseudotachylyte bounded by a carbonate-matrix implosion breccia was found
at a fossilized out-of-sequence thrust in the Shimanto accretionary complex,
Japan. This occurrence resulted from the following events: first implosion
of host rock due to interstitial fluid pressure increase and asymmetric
fracturing; second, Ca-Fe-Mg carbonate precipitation; and third, frictional
melting. The rock-record suggests that these events took place in a single
seismogenic slip event. Resulting from abrupt drop in fluid pressure after
implosion, hydro-fracturing and fluid escape, recovered high effective
friction promoted melting during fault movement. Coexistence of fluid
implosion breccia and pseudotachylyte has never been reported from
continental pseudotachylytes, but might be characteristic from hydrous
seismogenic faults in subduction zones. |
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