Boron isotopic composition of fumarolic condensates from some volcanoes in Japanese island arcs期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Boron isotopic composition of fumarolic condensates from some volcanoes in Japanese island arcs

Authors:	Masao Nomura Tadao Kanzaki Takejiro Ozawa Makoto Okamoto Hidetake Kakihana

Institution:	Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, O-Okayama 2-12-1, Meguro-Ku, Tokyo 152, Japan;Department of Chemistry, Tokyo Institute of Technology, O-Okayama 2-12-1, Meguro-Ku, Tokyo 152, Japan;Department of Environmental Chemistry, Faculty of Engineering, Saitama University, 255 Shimo-Okubo, Urawa-Shi, Saitama, Japan;Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, O-Okayama 2-12-1, Meguro-Ku, Tokyo 152, Japan;Institute of Plasma Physics, Nagoya University, Furo-Cho, Chigusa-Ku, Nagoya 464, Japan

Abstract:	Boron samples from 40 fumarolic condensates from volcanoes in the Ryukyu arc (Satsuma Iwo-jima and Shiratori Iwo-yama) and the North-east Japan arc (Usu-shinzan, Showa-shinzan, Esan and Issaikyo-yama) all have $^{11} B^{10} B$ ratios close to 4.07. Higher values, from 4.09 to 4.13, were only observed in condensates from volcanoes in the southernmost end of the North-east Japan arc (Nasu-dake), the northern part of the Izu-Bonin arc (Hakone), and the North Mariana arc (Ogasawara Iwo-jima). These higher values suggest geological interaction of the magmas with sea-water enriched in ¹¹B.

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