气候变化领域集成服务门户(CCPortal): Solid sulfur spherules near fumaroles of Hakone volcano; Japan

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DOI	10.1007/s00531-018-1657-z
	Solid sulfur spherules near fumaroles of Hakone volcano; Japan
	Ikehata K.; Date M.; Ishibashi J.-I.; Kikugawa G.; Mannen K.
发表日期	2019
ISSN	14373254
起始页码	347
结束页码	356
卷号	108 期号:1
英文摘要	Occurrence of sulfur spherules near subaerial fumaroles is relatively uncommon and their mineralogical characteristics and formation mechanisms are still incompletely understood. Yellow to greenish-gray solid sulfur spherules were observed near a fumarole that was formed in the fumarolic area (Owakudani) during the 2015 eruption of Hakone volcano, Japan. The yellow sulfur spherules (up to 1 mm in diameter) are composed entirely of α-sulfur, and the greenish-gray spherules (up to 2 mm in diameter) consist mainly of matrix-forming α-sulfur with lesser amounts of pyrite, amorphous silica, pyrophyllite, and rare marcasite. Based on the results of the field observations and the micro-analyses of the samples, these sulfur spherules were formed by rapid cooling of molten sulfur blobs ejected from a low-viscosity molten sulfur pool (124.7–128.7 °C) in the bottom of the fumarole during vigorous fumarolic activity. Color difference between yellow and greenish-gray sulfur spherules is explained by the presence of xenolithic altered mineral fragments in the greenish-gray sulfur spherules. Our observations indicate significant fluctuations of the level of the molten sulfur forming inside the fumarolic vent, and these fluctuations may imply the existence of other molten sulfur reservoirs beneath the fumarolic area. Presence of solid sulfur spherules in the fumarolic area may be an indicator of a molten sulfur pool within fumaroles or volcanic vents that are often difficult to directly observe. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Fumarole; Hakone volcano; Molten sulfur; Sulfur spherule
语种	英语
scopus关键词	formation mechanism; fumarole; spherule; sulfur; volcanic eruption; xenolith; Hakone Volcano; Honshu; Japan; Kanagawa; Kanto
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147881
作者单位	Faculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan; Department of Earth and Planetary Sciences, Faculty of Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan; Hot Springs Research Institute of Kanagawa Prefecture, 586 Iriuda, Odawara, Kanagawa 250-0031, Japan
推荐引用方式 GB/T 7714	Ikehata K.,Date M.,Ishibashi J.-I.,et al. Solid sulfur spherules near fumaroles of Hakone volcano; Japan[J],2019,108(1).
APA	Ikehata K.,Date M.,Ishibashi J.-I.,Kikugawa G.,&Mannen K..(2019).Solid sulfur spherules near fumaroles of Hakone volcano; Japan.International Journal of Earth Sciences,108(1).
MLA	Ikehata K.,et al."Solid sulfur spherules near fumaroles of Hakone volcano; Japan".International Journal of Earth Sciences 108.1(2019).