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Vol.XVIII, No.4 >

Relict Clinopyroxenes in the Mikabu Greenstones, Oshika and Kosetokyo Districts, Nagano Prefecture, Central Japan

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Title: Relict Clinopyroxenes in the Mikabu Greenstones, Oshika and Kosetokyo Districts, Nagano Prefecture, Central Japan
Authors: Watanabe, Teruo Browse this author
Kawachi, Yosuke Browse this author
Yuasa, Makoto Browse this author
Issue Date: Sep-1978
Publisher: 北海道大学
Journal Title: 北海道大学理学部紀要
Journal Title(alt): Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy
Volume: 18
Issue: 4
Start Page: 509
End Page: 520
Abstract: Magma types and spilitization process of the metamorphosed greenstones (Mikabu greenstones) in the Oshika and Kosetokyo districts were examined on the basis of the chemical composition of rocks and relict clinopyroxenes. The alkali contents of the rocks are plotted in both alkaline and tholeiite basalt fields. However, most greenstones with high alkali contents have less TiO2 and P2O5 than typical alkali basalts. One of the rocks carries the clinopyroxene with high Si and low Ti contents as in tholeiite basalts. These features may be interpreted as due to spilitization. It is suggested that most of the original rocks of the Mikabu greenstones of these districts, especially of Kosetokyo district, show an oceanic tholeiite affinity, though some an alkali basaltic affinity.
Type: bulletin (article)
URI: http://hdl.handle.net/2115/36670
Appears in Collections:Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy > Vol.XVIII, No.4

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