STRATIGRAPHY, DISTRIBUTION, MINERALOGY, AND GEOCHEMISTRY OF LATE QUATERNARY TEPHRAS ERUPTED FROM THE IWATE AND AKITA-YAKEYAMA VOLCANOES, NORTHEASTERN JAPAN
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概要
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Late Quaternary tephras originated from the Iwate and Akita-Yakeyama Volcanoes distributed in their eastern parts and covered on the are a along the upper course of the Kitakami River and on the central Kitakami Mountains.The tephras originated from the Iwate Volcano were divided, in the ascending order, into the Nishine Volcanic Ash, the Shibutami Volcanic Ash, the Iwate Volcanic Ash (IW)-b_2,IW-b_1,IW-a_2,and IW-a_1.The distribution of marker beds of these tephras was studied and their thickness contour maps were shown.IW-a_1 to IW-b_2 were pyroclastics erupted from the Higashi-Iwate Volcano in Holocene.The Shibutami and Nishine Volcanic Ashes were erupted from the Nishi-Iwate Volcano in Upper Pleistocene.On the other hand, the Akita-Yakeyama Pumice (AYP) and the Kawaguchi Pumice (KwP) were ejecta originated from the Akita-Yakeyama Volcano.AYP and KwP were sandwiched respectively between IW-a_2 and IW-b_1,and the shibutami and the Nishine Volcanic Ashes. The Holocene tephras erupted from the Higashi-Iwate Volcano were dominant in olivine and two pyroxenes, but the Shibutami Volcanic Ash, AYP and KwP were dominant in two pyroxenes and magnetite.The chemical components, Fe, Ti, Mn, V, and Zn, of ferromagnetic minerals purified from pyroclastics were determined.From the relationships between V/(Fe+Ti) and Zn/(Fe+Ti) of ferromagnetic minerals, the rock type of pyroclastics was determined as follows; andesitic for volcanic ashes, the Oide Pumice, and the Yukinoura Pumice in the Shibutami Volcanic Ash, and rhyolitic for AYP and KwP.On the other hand, the Higashi-Iwate tephras were basaltic, and ferromagnetic minerals couldn't be collected from these pyroclastics. Fossils of periglacial phenomena in the last glacial age were observed on the Furukawa, Ippongi, and Wakare Scoria beds in the Shibutami Volcanic Ash covering the eastern to southern foots of Mt.Iwate-san.The morphological features of some soil profiles derived from these tephra deposits were also discussed.
- 一般社団法人日本土壌肥料学会の論文
著者
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Inoue Katsuhiro
Faculty Of Agriculture Iwate University
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Yoshida Minoru
Facul. Of Med. Res. Inst. For Dis. Of Chest Kyushu University
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