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Muro Pyroclastic Flow Deposit

Synonym: Muro Ignimbrite

Synonym: Sekibutsu Tuff Member (Marginal facies), Tamateyama Tuff Bed (Marginal facies), Furudera Tuff (Marginal facies)

It had been considered a member of Setouchi Volcanic Rocks.

• Type locality: Muro, Uda city, Nara prefecture
• Outflow deposit from a caldera volcano
• Volcanic rocks
• Miocene (16 - 14 Ma, K-Ar; 14.9 Ma, FT)
• Correlation: Kbi, Kn-1?

• Sedimentary facies: Terrestrial
• Lithofacies: Pyroclastic flow deposit
• Lithofacies: Orthopyroxene-biotite rhyolite - dacite welded volcanic lapilli tuff
• Lithofacies (Minor): Obsidian, Volcanic ash
• Lithofacies (Accidental fragments): None
• Lithofacies (Basal facies): Volcanic ash
• Lithofacies (Basal facies, Accidental fragments): Chert, Mudstone

• Source: central - eastern Kii peninsula (Kumano Acidic Rocks or Odai caldera)
• Mode of eruption: Plinian
• Eruptive volume (Present): ca. 62 km³
• Eruptive volume (Original): 100 km³ or more
• Thickness (Overall): ca. 400 m
• Thickness (Basal): 20 m or thinner
• Distribution (East-West): ca. 28 km
• Distribution (South-North): ca. 15 km
• Running distance: 50 km or more

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: middle east of Nara pref.; eastern margin of Osaka pref.; middle west of Mie pref.
• Distribution: Byobu-iwa, Soni city, Nara pref.; Muro, Uda city, Nara pref.

• Sato et al. (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.53-69 DOI
• Shinjoe et al. (2010) Jour. Geol. Soc. Japan, vol.116, no.8, pp.447-452 DOI
• Iwano et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.8, pp.427-432 DOI
• Yamashita et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.7, pp.340-352 DOI
• Iwano et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.7, pp.326-339 DOI
• Shinjoe et al. (2007) Jour. Geol. Soc. Japan, vol.113, no.7, pp.310-325 DOI