飛騨山脈中央部,上廊下〜雲ノ平周辺の第四紀火山岩類のK-Ar年代

概要

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Quaternary volcanic products erupted from five volcanoes located in the central part of the Hida Mountain Range. These are the Kaminorouka Volcanic Rocks, the Warimodake Andesite, and eruptives from Iwagokekotani, Kumonotaira, and Washibaike volcanoes. We have determined the K-Ar ages for five lava samples collected from above volcanoes except for Washibaike Volcano. The K-Ar ages are measured for separated groundmass from the lavas. Based on the newly obtained ages, previously reported seven radiometric ages, and volcanostrati-graphic data, we identify activity periods of each centers. These are : ca. 0.9 Ma for Iwagokekotani Volcano, 0.4-0.2 Ma for the Kaminorouka Volcanic Rocks, 0.3-0.1 Ma for Kumonotaira Volcano, ca. 0.3 Ma for Warimodake andesite, and 0.12-0.01 Ma for Washibaike Volcano, most of which are in the late early Pleistocene to the late Pleistocene.
特定非営利活動法人日本火山学会の論文
2003-08-31