BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN

Online ISSN : 2189-7182
Print ISSN : 0453-4360
ISSN-L : 0453-4360

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Volume 41, Issue 6

Displaying 1-6 of 6 articles from this issue

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Photogravure

Article type: Photogravure
1996 Volume 41 Issue 6 Pages App2-
Published: December 15, 1996
Released on J-STAGE: March 20, 2017

DOIhttps://doi.org/10.18940/kazan.41.6_App2

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K-Ar Ages for the Middle Miocene Muro Volcanic Rock, Southwest Japan

Kozo UTO, Ken ANNO, Masafumi SUDO, Shigeru UCHIUMI

Article type: Article
1996 Volume 41 Issue 6 Pages 257-261
Published: December 15, 1996
Released on J-STAGE: March 20, 2017

DOIhttps://doi.org/10.18940/kazan.41.6_257

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The Muro Volcanic Rock is a large scale welded pyroclastic flow deposit in the central part of Kii Peninsula, Southwest Japan. It belongs to the Middle Miocene Setouchi Volcanic Rocks and has been considered to have erupted before Southwest Japan made a clockwise rotation. K-Ar dating was performed using two diffrent procedures for biotite separates from two vitrophyres, which are about a few tens meters apart from each other. The conventional isotopic dilution method gives the age of 14.7±0.5 Ma (weighted mean of four ages), while the unspiked method gives the age of 14.44±0.16 Ma (weighted mean of two). These ages are slightly younger than previous dates, and indicate that the clockwise rotation of Southwest Japan occrred after 14.5 Ma.

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Chemical Composition of Volcanic Gases Associated with the 1991-1992 Activity of Shinmoe-dake, Kirishima Volcanoes, Japan

Jun-ichi HIRABAYASHI, Takeshi OHBA, Kenji NOGAMI

Article type: Letter
1996 Volume 41 Issue 6 Pages 263-267
Published: December 15, 1996
Released on J-STAGE: March 20, 2017

DOIhttps://doi.org/10.18940/kazan.41.6_263

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Elemental Compositions of Recent Eruptive Products from Miyakejima Volcano

Jun SATO, Toshihiro NAKAMURA, Haruo TAKAHASHI, Kazuo SATO

Article type: Letter
1996 Volume 41 Issue 6 Pages 269-274
Published: December 15, 1996
Released on J-STAGE: March 20, 2017

DOIhttps://doi.org/10.18940/kazan.41.6_269

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Spectrophotometoric Determination of FeO Content in Igneous Rock by using 1,10-phenanthroline

Kenji NOGAMI

Article type: Letter
1996 Volume 41 Issue 6 Pages 275-278
Published: December 15, 1996
Released on J-STAGE: March 20, 2017

DOIhttps://doi.org/10.18940/kazan.41.6_275

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Volcanic Activity of Soufriere Hills Volcano, Montserrat, Caribbean Sea

Setsuya NAKADA, Hiroshi SHIMIZU

Article type: Commentary on Photogravure
1996 Volume 41 Issue 6 Pages 303-308
Published: December 15, 1996
Released on J-STAGE: March 20, 2017

DOIhttps://doi.org/10.18940/kazan.41.6_303

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