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Vol.XXI, No.3 >

Dumortierite-Bearing Argillaceous Gneisses from the Abukuma Metamorphic Terrain, Northeast Japan

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Title: Dumortierite-Bearing Argillaceous Gneisses from the Abukuma Metamorphic Terrain, Northeast Japan
Authors: Takahata, Hiroyuki Browse this author
Uchiyama, Koji Browse this author
Issue Date: Aug-1985
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: 21
Issue: 3
Start Page: 465
End Page: 481
Abstract: Newly found dumortierite occurring as a minor constituent mineral in argillaceous gneisses of the Abukuma axial metamorphic belt, northeast Japan, is described. At present, dumortierite has been known from only three localities. The mineral in question is found in feldspar porphyroblastic gneiss of the Takanuki metamorphics and argillaceous diaphthoritic gneiss. All of the known dumortierites occur in leucocratic seams within the host gneisses. Dumortierite is found in interstices of the major constituent minerals of the leucocratic seams, and replaces neighboring plagioclase or cordierite, indicating that the dumortierite formed at the latest stage of formation of the leucocratic seams. As a result of the petrogenetic studies on these host gneisses, it may be concluded that the dumonierite-bearing leucocratic seams are the products of metamorphic differentiation which proceeded through porphyroblastesis and produced the leucocratic and melanocratic layers. It is likely that boron was initially contained in the source rocks of these gneisses and concentrated into the leucocralic seams. The concentration of boron may have reached high enough to form dumortierite at the latest stage of the formation of leucocralic seam.
Type: bulletin (article)
URI: http://hdl.handle.net/2115/36739
Appears in Collections:Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy > Vol.XXI, No.3

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