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Titolo:
Early Tertiary fluid flow and pressure-temperature conditions in the Shimanto accretionary complex of south-west Japan: constraints from fluid inclusions
Autore:
Lewis, JC; Byrne, TB; Pasteris, JD; London, D; Morgan, GB;
Indirizzi:
Univ Calif Davis, Dept Geol, Davis, CA 95616 USA Univ Calif Davis Davis CA USA 95616 Davis, Dept Geol, Davis, CA 95616 USA Univ Connecticut, Dept Geol & Geophys, Storrs, CT 06269 USA Univ Connecticut Storrs CT USA 06269 Geol & Geophys, Storrs, CT 06269 USA Washington Univ, Dept Earth & Planetary Sci, St Louis, MO 63130 USA Washington Univ St Louis MO USA 63130 anetary Sci, St Louis, MO 63130 USA Univ Oklahoma, Sch Geol & Geophys, Norman, OK 73019 USA Univ Oklahoma Norman OK USA 73019 ch Geol & Geophys, Norman, OK 73019 USA
Titolo Testata:
JOURNAL OF METAMORPHIC GEOLOGY
fascicolo: 3, volume: 18, anno: 2000,
pagine: 319 - 333
SICI:
0263-4929(200005)18:3<319:ETFFAP>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
RIDGE SUBDUCTION; PHILIPPINE SEA; CENTRAL ALPS; KODIAK; PRISM; PLATE; BELT; DEFORMATION; ALASKA; RECONSTRUCTION;
Keywords:
accretionary prism; brittle faults; paleo-thermobarometry; Shimanto belt; SW Japan;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
59
Recensione:
Indirizzi per estratti:
Indirizzo: Lewis, JC Univ Calif Davis, Dept Geol, Davis, CA 95616 USA Univ Calif Davis Davis CA USA 95616 t Geol, Davis, CA 95616 USA
Citazione:
J.C. Lewis et al., "Early Tertiary fluid flow and pressure-temperature conditions in the Shimanto accretionary complex of south-west Japan: constraints from fluid inclusions", J METAMORPH, 18(3), 2000, pp. 319-333

Abstract

The pressure and temperature history of the Tertiary Shimanto belt of south-west Japan has been elucidated by analysing fluids trapped in quartz crystals which grew syn-kinematically along late-stage brittle faults. The samples come from three areas that span the Paleogene exposures on the Muroto Peninsula of Shikoku Island. Applying microthermometric and laser Raman microsampling techniques to coeval water-rich and carbonic fluid inclusions, wehave constrained the pressure and temperature conditions that accompanied a widespread and kinematically distinct phase of deformation. The results suggest elevated geothermal gradients during late-stage deformation, conditions that are in disaccord with previous plate reconstructions that have depicted old, thermally mature Pacific crust subducting beneath Eurasia duringthe early to middle Tertiary. These conditions can most easily be accounted for by including an additional plate boundary in the western Pacific during Paleogene time. Plate reconstructions that include the Kula plate in this region are therefore consistent with our findings. In addition, our results provide clues to the conditions that likely accompany seismogenic deformation at active convergent plate boundaries.

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Documento generato il 26/09/20 alle ore 10:53:04