Sulfar and chlorine yield from island arc.rolcano ; Volatiles in melt inclusion of phenocrysts.

罗卡诺岛弧的硫和氯产量；

• 批准号: 11640448
• 负责人: YAMAGUCHI Yoshiaki
• 金额: $ 2.43万
• 依托单位: Shinshu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11640448/
• 关键词: arc volcanoes; sulfur yield; melt inclusion; olivine phenocryst; mafic magma; large sulfur solubility; subduction zone; サブダクション帯; 浅間火山; 斑晶メルト包有物; イオウ濃度; 硬石こう; マイクロプローブ分析

Melt inclusion studies of Asama volcano have found mafic melts trapped in olivine, rare phenocrysts derived from the mafic magma, and provided an insight that basaltic liquid played an important role as the mafic endmember of the mixed magma system. Olivine phenocrysts contain mafic melt inclusions of basaltic to andesitic compositions. The mafic melt inclusions have very large sulfur concentration (0.15-0.34 wt% S). Measured wavelength shifts of sulfur X-rays for the basaltic melt inclusions indicate that the dominant sulfur-bearing species is SO_4^<2->, with a correspondingly high sulfur solubility. It appears probable that a relatively oxidized basaltic melt at the subduction zone could have a large concentration of sulfur, and therefore, subduction-related arc volcanisms potentially supply a large amount of mantle-derived sulfur to the earth's surface.

浅间火山熔体包裹体研究发现了包裹在橄榄石中的镁铁质熔体，以及罕见的来自镁铁质岩浆的斑晶，揭示了玄武质流体作为镁铁质端元在混合岩浆体系中的重要作用。橄榄石斑晶含有玄武质到安山质成分的镁铁质熔体包裹体。镁铁质熔体包裹体具有非常高的硫浓度（0.15- 0.34wt%S）。玄武岩熔体包裹体中硫的X射线波长变化表明，主要含硫组分为SO_4 ~（2+）<2->，硫的溶解度较高。俯冲带相对氧化的玄武岩熔体可能含有大量的硫，因此，与俯冲有关的弧火山活动可能向地球表面提供大量的地幔硫。

项目成果

Yamaguchi, Y., Nagatome, T.and Makino, K.: "High-sulfur melt inclusions and immiscible sulfides in phenocrysts of the Asama Volcano"1998 Annual meeting, Abstracts of the Japanese Association of Mineralogists, Petrologists and Economic Geologists. 158 (199

Yamaguchi, Y.、Nagatome, T. 和 Makino, K.：“浅间火山斑晶中的高硫熔体包裹体和不混溶硫化物”1998 年年会，日本矿物学家、岩石学家和经济地质学家协会摘要。

Satoh, H.and Yamaguchi, Y.: "Oxygen Isotope Microanalysis of Groundmass in Unzen 1792 and 1991-1995 Lavas"WPGM Meeting 2000. (Abstracts). V31B-09 (2000)

Satoh, H. 和 Yamaguchi, Y.：“云仙 1792 年和 1991-1995 年熔岩基质的氧同位素微分析”WPGM 会议 2000 年。（摘要）。

Yamaguchi, Y.: "Sulfur yield of magma of the Asama Volcano : in view of melt inclusion of phenocrysts"Report of annual meeting of Earthquake Research Institute of the University of Tokyo. (in print). (2001)

Yamaguchi, Y.：“浅间火山岩浆的硫产量：鉴于斑晶的熔融包裹体”东京大学地震研究所年会报告。

Satoh,H.and Yamaguchi,Y: "Oxygen Isotope Microanalyis of Groundmass in Unzen 1792 and 1991-1995 Lavas"WPGM Meeting 2000 abstract. V31B-09 (2000)

Satoh, H. 和 Yamaguchi, Y：“云仙 1792 年和 1991-1995 年熔岩地基体的氧同位素微分析”WPGM 会议 2000 年摘要。

Yamaguchi, Y., Nagatome, T.and Makino, K.: "Oxidation state and sulfur concentration of melt inclusion in phenocrysts of the Asama Volcano"1999 Annual meeting, Abstracts of the Japanese Association of Mineralogists, Petrologists and Economic Geologists. 4

Yamaguchi, Y.、Nagatome, T. 和 Makino, K.：“浅间火山斑晶中熔体包裹体的氧化状态和硫浓度”1999 年年会，日本矿物学家、岩石学家和经济地质学家协会摘要。