Behaviour of fluorine in some Tertiary dolerite sills, Japan

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Authors:Kanisawa, S.; Aoki, K.
Volume Title:Ganseki Kobutsu Kosho Gakkai-Shi Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists
Source:Ganseki Kobutsu Kosho Gakkai-Shi = Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists, 73(3), p.78-81. Publisher: Nippon Ganseki Kobutsu Kosho Gakkai, c/o: Tohoku Daigaku Rigakubu, Sendai, Japan. ISSN: 0021-4825
Publication Date:1978
Note:In Japanese with English summary. 16 refs.; illus. incl. tables
Summary:Abundances of F in some Tertiary dolerite sills in Japan have been determined using a selective ion-electrode in order to clarify the behaviour of F in basaltic magma with advancing differentiation. The Hatozaki alkali-dolerite sill, the Odate olivine dolerite sill, and the Otaki olivine dolerite sill in NE Japan have 206, 225 and 283 p.p.m. average F content in the main mass, while 427, 413 and 469 p.p.m. in the late differentiates, respectively. The Murotomisaki gabbro in SW Japan has 77 p.p.m. average F content in the main mass and 137 p.p.m. in the late differentiates. All dolerite sills studied show the tendency that the F content increases with advancing differentiation. The relation between F content and P2O5 shows distinct positive correlation in the rocks of the Odate and the Otaki sills, while it does not show any distinct correlation in the Hatozaki and Muroto masses. The late differentiates of the Hatozaki sill have large amounts of hydrous minerals such as analcite and thomsonite and lesser biotite and hornblende, thus most F in these rocks may enter into these minerals replacing OH. However, F in the Odate and the Otaki sills may be contained in apatite. [M.Ak.]
Subjects:Basalts; Cenozoic; Chemical composition; Diabase; Differentiation; Fluorine; Geochemistry; Halogens; Igneous rocks; Intrusions; Ion probe data; Magmas; Mass spectra; Petrology; Plutonic rocks; Segregation; Sills; Spectra; Tertiary; Trace elements; Volcanic rocks; Akita Japan; Asia; Far East; Honshu; Japan; Odate Japan; Abundance; Hatozaki; Muroto; Otaki
Coordinates:N300000 N450000 E1470000 E1290000
Abstract Numbers:82M/1468
Record ID:1978029815
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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