1987 Fiscal Year Final Research Report Summary
MECHANISM OF FORMATION OF VOLCANIC ASHES FROM SAKURAJIMA VOLCANO, JAPAN, AND ITS ENVIRONMENTAL EFFECTS
| Project/Area Number |
60540526
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
鉱物学(含岩石・鉱床学)
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| Research Institution | Kagoshima University |
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Principal Investigator |
OBA Noboru Faculty of science, Kagoshima University, 理学部, 教授 (00041210)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAMOTO Masahiko Fuculty of Science, Kagoshima University, 理学部, 助手 (00041236)
TOMITA Katsutoshi Faculty of Science, Kagoshima University, 理学部, 助教授 (20041220)
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| Project Period (FY) |
1985 – 1987
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| Keywords | Sakurajima / Volcanic ash / Black ash / Red ash / White ash / 火山ガラス |
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| Research Abstract |
With respect to volcanic ashes from Sakurajima Volcano, Japan, modal and chemical analyses, x-ray diffraction, differential thermal analysis, polarized microscopy, scanning electron microscopy and grain-size distribution measurement have been carried out.
The volcanic ashes can be grouped into major three on mass color appearance: black ashes, i. e., most common volcanic ashes; red ashes; red ahses characterized by desilication, the high-content of ferric iron oxide and the presence of cristobalite, calcium hydrosulfate and calsium sulfate; and white ashes characterized by aboudant grains of vesiculated volcanic glass. The presence of vesiculated volcanic glass grains and calcium hydrosulfate crystals in common volcanic ashes are significant in such a respect showing that volcanic ashes were subjected to the adiabatic expansion and some chemical reaction due to volcanic gases at the time of eruption.
The natural and social environments are affected by major two factors due to volcanic ashes and its accompanying volcanic gases; physical factor attributed to the substantial nature and grain size of volcanic ash-composing materials, and chemical factor to volcanic gases.
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[Publications] 大庭昇,富田克利,山本温彦,Istidjob,M,;Badruddin,M,;Sudradjat,A.;Subanda,T.: Proceedings of Symposium on 100 Years Development of Krakatau and its Surroundings,Jakarta,Indonesia,1983. 1. 94-99 (1985)
Description
「研究成果報告書概要(和文)」より
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[Publications] 大庭昇,富田克利,山本温彦,Istidjob,M,;Sudradjat,A.;Subanda,T.: Proceedings of 5th Regional Congress on Geology,Mineral and Energy Resources of Southeast Asia, and Geological Society of Malaysia,Kuala Lumpur,Malaysia,1984. 1. 51-68 (1986)
Description
「研究成果報告書概要(和文)」より
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[Publications] Oba, N,. Tomita, K., Yamamoto, M., Istidjab, M., Badruddin, M., Sudradjat, A. and Suhanda, T.: "Geochemical comparison of volcanic products of Krakatau Group and Aira Caldera-Sakurajima Volcano" Proceedings of Symposium on 100 Years Deveolpment of Krakatau and its Surroundings, Jakarta, Indonesia, 1983.1. 94-99. (1985)
Description
「研究成果報告書概要(欧文)」より
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[Publications] Oba, N., Tomita, K., Yamamot, M., Istidjab, M., Sudradjat, A. and Suhanda, T.: "Geological significance of granitic fragments forund from pumice flow of 1883 eruption at the Krakatau Group, Indonesia" Proceedings of 5th Regional Congress on Geology, Mineral and Energy Resources of Southeast Asia, and Geological Society of Malaysia, Kuala Lumpur, Malaysia, 1984. 1. 51-68 (1986)
Description
「研究成果報告書概要(欧文)」より
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