新生代の大規模火砕流地域の地質(特集濃飛流紋岩およびそれに関連する酸性火成作用-地団研第24回総会シンポジウム-)

概要

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Geology of some Cenozoic silicic pyroclastic flow fields-Valles caldera, New Mexico; rhyolite plateau of North Island, New Zealand and that of Chillean Andes ; Basin and Range province, western United States-is reviewed. These large-scale pyroclastic flow fields, except the first one which is a single caldera, had been formed in a fairly long time duration by intermittently repeated eruptions of pyroclastic flows. One such pyroclastic flow field contains calderas or resurgent cauldrons each of which is formed by one-cycle eruption of pyroclastic flows. Between cycles of pyroclastic flow eruption occurred regional tumescence and tensional fracturing, erosion and sedimentation. Those pictures seem to conform to the geology of the Nohi rhyolite so far known.
地学団体研究会の論文
1971-03-25