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浩毅, 鎌田; 洋文, 村岡

doi:10.5575/geosoc.90.125

Jour. Geol. Soc. Japan

1984

DOI: 10.5575/geosoc.90.125

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鎌田浩毅¹,

村岡洋文²

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Cited by 6 publications

(2 citation statements)

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“…The pre-Aso volcanic rocks are divided into five types by Ono and Watanabe 1985 : biotite rhyolite; hornblende dacite; hornblende andesite; pyroxene andesite; basalt. Data sources of K−Ar ages: Kaneoka and Kojima 1970 ;Ono et al 1982 ;Kamata 1985 ;Watanabe et al 1989 ;Matsumoto et al 1991 . andesite; E hb−2px andesite; F hb andesite; G 2px−hb dacite; H hb−bt rhyolites.…”

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Petrography and whole-rock geochemistry of pre-Aso lavas from the caldera wall of Aso volcano, central Kyushu

Miyoshi

Furukawa

Shinmura

et al. 2009

Jour. Geol. Soc. Japan

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Pre-caldera volcanism in the Aso area . − . Ma , central Kyushu, is characterized by effusive eruptions of multiple lava flows. To clarify the chemical evolution of the magma chamber beneath the Aso area, we investigated the petrological characteristics of these lavas where exposed in the caldera wall.The pre-caldera lavas are divided into eight types with distinct petrographic and compositional characteristics: A. cpx-ol basalt, B. ol-px andesite, C. ol-hb-px andesite, D. px andesite, E. hb-px andesite, F. hb andesite, G. px-hb dacite, and H. bt-hb rhyolite. Incompatible trace element modeling demonstrated that these eight types did not originate via simple fractional crystallization.The phase assemblages and abundances of phenocrysts of the precaldera andesite-rhyolite differ from those of the caldera-forming and post-caldera andesite−rhyolite. In addition, the pre-caldera andesiterhyolite contain relatively low concentrations of incompatible trace elements compared to the caldera-forming and post-caldera andesiterhyolite. These observations may indicate that the physical conditions and/or chemical compositions of the source materials that gave rise to the andesite-rhyolite magmas differed between the pre-caldera and caldera-forming stages. AbstractKeywords: Aso, pre-caldera volcanism, petrography, bulk-rock geochemistry

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“…andesite; E hb−2px andesite; F hb andesite; G 2px−hb dacite; H hb−bt rhyolites. Data sources of K−Ar ages: Kaneoka and Kojima 1970 ;Ono et al 1982 ;Kamata 1985 ;NEDO 1990 ;Matsumoto et al 1991 . Table . Major and trace element data for samples of pre-Aso volcanic rocks.…”

mentioning

confidence: 99%

Petrography and whole-rock geochemistry of pre-Aso lavas from the caldera wall of Aso volcano, central Kyushu

Miyoshi

Furukawa

Shinmura

et al. 2009

Jour. Geol. Soc. Japan

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A Pliocene rhinocerotid (Mammalia, Perissodactyla) from Ajimu, Oita Prefecture, southwestern Japan, with comments on the Japanese Pliocene rhinocerotid fossil records

Handa

Kato

2020

PalZ

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Late Cenozoic vegetational and climatic changes in Kyushu, Japan

Iwauchi¹

1994

Palaeogeography, Palaeoclimatology, Palaeoecology

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Untitled

Cited by 6 publications

References 2 publications

Petrography and whole-rock geochemistry of pre-Aso lavas from the caldera wall of Aso volcano, central Kyushu

Petrography and whole-rock geochemistry of pre-Aso lavas from the caldera wall of Aso volcano, central Kyushu

A Pliocene rhinocerotid (Mammalia, Perissodactyla) from Ajimu, Oita Prefecture, southwestern Japan, with comments on the Japanese Pliocene rhinocerotid fossil records

Late Cenozoic vegetational and climatic changes in Kyushu, Japan

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