Note on rock-forming minerals in the Joetsu district, Niigata Prefecture,Japan. (14) Hornblende in the volcanic rocks from the Yoneyama and Myoko volcanos

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概要

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• The volcanic rocks of the Myoko in Quaternary and the Yoneyama in late Pleiocene are distribed in the Nishikubiki region, Niigata Prefecture. In the Myoko volcanoes, pyroxene and hornblende andesites are common, and basalt is accompanied in subordinate amount. The majority of volcanic rocks from the Yoneyama are two pyroxene andesite, they are the rock types as follows: olivine-clinopyroxene-orthopyroxene basalt with or without hornblende, clinopyroxene- orthopyroxene andesite and hornblende clinopyroxene-orthopyroxene andesite. Hornblende gabbro occurs in these volcanic rocks. The amphiboles from the Yoneyama are magnesiohornblende to pargasite, on the other hand, the amphiboles from the Myoko except for the Maruyama lava are magnesiohornblende. Amphiboles in the Maruyama lava are pargasite. Amphiboles in the volcanic rocks from both the Myoko and Yoneyama in this study are near the tremolite-pargasite join in the field of hornblende from gabbroic inclusions from the Yoneyama.

• 上越教育大学の論文

著者

• Oba Takanobu

  Division Of Mathematics And Science : Depertment Of Geosciences

• Oba Takanobu

  Division Of Science : Department Of Science Education

関連論文

• Zoning type of a plagioclase in the volcanic rocks from the Myoko and Yakeyama volcanoes, Niigata Prefecture, Japan
• Note on rock-forming minerals in the Joetsu district, Niigata Prefecture,Japan. (14) Hornblende in the volcanic rocks from the Yoneyama and Myoko volcanos
• Chemistry of chromian spinel in picrite sill from Ogi, Sado island, Niigata Prefecture, Japan
• Note on rock-forming minerals (1) Chemical compositions of Ca-amplibole in the late Tertiary volcanic rocks from the joetsu district

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