40Ar/39Ar whole-rock dating of metapelites from the Mikabu and Sambagawa Belts, western Kii Peninsula, Southwest Japan.

Jong, Koen de; Kurimoto, Chikao; Guise, Phil

doi:10.5575/geosoc.106.703

Cited by 12 publications

(7 citation statements)

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“…Metamorphic ages of the Kebara Formation are reported as 100-93 Ma (Isozaki et al, 1992) and 97-89 Ma (Kurimoto, 1993) by K-Ar method for white-mica in pelitic and mafic rocks. Whole-rock 40 Ar/ 39 Ar ages of 103 and 96 Ma have been also reported for pelitic schists (de Jong et al, 2000).…”

Section: Geological Background and Samplesmentioning

confidence: 96%

“…Ar/ 39 Ar and K-Ar age data of the Kebara Formation are slightly older than the Sanbagawa belt of the Kii Peninsula (Isozaki et al, 1992;Kurimoto, 1993;de Jong et al, 2000). Therefore, the attribution of the Kebara Formation is a lasting question for the researchers of the Kii Peninsula.…”

Section: Furthermore Published 40mentioning

confidence: 99%

“…Ar/ 39 Ar age data of the Kebara Formation range 103-89 Ma (Isozaki et al, 1992;Kurimoto, 1993;de Jong et al, 2000) while those in the Sanbagawa metamorphic belt of the Shimizu-Misato area mostly range 85-72 Ma with two exceptions (Kurimoto, 1993(Kurimoto, , 1995(Kurimoto, , 2013. On the other hand, K-Ar age data of the Mikabu belt range 118-82 Ma with one exception (Kurimoto, 1995(Kurimoto, , 2013.…”

mentioning

confidence: 99%

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Thermal structure of the Kebara Formation and its proximal areas in the western Kii Peninsula, SW Japan: Application of the carbonaceous material Raman geothermometry

Yoshida

Aoyagi

Kato

et al. 2016

Journal of Mineralogical and Petrological Sciences

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Section: Geological Background and Samplesmentioning

confidence: 96%

Section: Furthermore Published 40mentioning

confidence: 99%

mentioning

confidence: 99%

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Thermal structure of the Kebara Formation and its proximal areas in the western Kii Peninsula, SW Japan: Application of the carbonaceous material Raman geothermometry

Yoshida

Aoyagi

Kato

et al. 2016

Journal of Mineralogical and Petrological Sciences

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“…The Kebara Formation is mainly composed of pelitic schist and a minor amount of lenses or layers of metabasite, siliceous schist, and marble (e.g., Kurimoto, 1986aKurimoto, , 1986bTomiyoshi and Takasu, 2009 (Isozaki et al, 1992;Kurimoto, 1993;De Jong et al, 2000). These ages are slightly older than those reported for the Sanbagawa belt of the Kii Peninsula (85-72Ma with two exceptions; Kurimoto, 1993Kurimoto, , 1995Kurimoto, , 2013.…”

Section: Geological and Petrological Backgroundmentioning

confidence: 41%

Petrology and possible significance of barroisite–bearing metabasite from the Kebara Formation in NW Kii Peninsula

Kato

Hirajima

2017

Journal of Mineralogical and Petrological Sciences

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We report the new finding of barroisite (Brs)-bearing metabasites within a metabasite layer from the Kebara Formation, a unit exposed between the Sanbagawa and the Chichibu belts in NW Kii Peninsula. The dominant lithotype of the metabasite layer shows pale-green colors and is mainly composed of sodium amphibole, actinolite, pumpellyite and epidote. It is in agreement with reported mineral assemblages in the Kebara Formation which document pumpellyite-actinolite (PA) or pumpellyite-blueschist (PBS) facies conditions (<340°C and 0.8 GPa), and with geothermometry based on the Raman analysis of carbonaceous material from metapelite samples which give peak metamorphic temperatures of 300-340°C. Brs grains are identified from metabasites with dark-green color in the layer, and are closely associated with epidote, chlorite, white mica, albite and quartz, but not with pumpellyite. Brs grains are replaced by sodium amphibole and/or winchite at the rim with a distinct compositional gap. Thermodynamic calculation suggests that the Brs + epidote + chlorite + albite + quartz assemblage is stable at P-T conditions higher than 450°C and 0.4 GPa. The abovementioned data suggest that the Brs-bearing metabasites suffered an early higher temperature (>450°C) metamorphism and then overprinted by PA or PBS facies metamorphism along with the main constituents of the Kebara Formation. In the Besshi area of the Sanbagawa belt, the earlier subducted higher grade rocks are considered to juxtapose to the newly subducted rocks and overprinted retrograde metamorphism during their exhumation stage. Our new finding suggests that the similar phenomenon was took place in the lower grade part of the Sanbagawa belt.

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“…The Mikabu belt is a greenstone-dominated subduction-accretion complex metamorphosed from pumpellyite-actinolite to clinopyroxene-lawsonite-actinolite facies (Banno and Sakai 1989;Banno 1998;Suzuki and Ishizuka 1998) in the middle Cretaceous (Dallmeyer et al 1995;de Jong et al 1999de Jong et al , 2000. Maruyama et al (1997) considered the belt as a remnant of a palaeo-oceanic plateau.…”

Section: The Outer Zonementioning

confidence: 99%

Triassic 40Ar/39Ar ages from the Sakaigawa unit, Kii Peninsula, Japan: implications for possible merger of the Central Asian Orogenic Belt with large-scale tectonic systems of the East Asian margin

Jong

Kurimoto

Ruffet

2008

Int J Earth Sci (Geol Rundsch)

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40Ar/39Ar whole-rock dating of metapelites from the Mikabu and Sambagawa Belts, western Kii Peninsula, Southwest Japan.

Cited by 12 publications

References 0 publications

Thermal structure of the Kebara Formation and its proximal areas in the western Kii Peninsula, SW Japan: Application of the carbonaceous material Raman geothermometry

Thermal structure of the Kebara Formation and its proximal areas in the western Kii Peninsula, SW Japan: Application of the carbonaceous material Raman geothermometry

Petrology and possible significance of barroisite–bearing metabasite from the Kebara Formation in NW Kii Peninsula

Triassic 40Ar/39Ar ages from the Sakaigawa unit, Kii Peninsula, Japan: implications for possible merger of the Central Asian Orogenic Belt with large-scale tectonic systems of the East Asian margin

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