Petrological characteristics and volatile content of magma from the 2000 eruption of Miyakejima Volcano, Japan

Saito, Genji; Uto, Kozo; Kazahaya, Kohei; Shinohara, Hiroshi; Kawanabe, Yoshihisa; Satoh, Hisao

doi:10.1007/s00445-005-0431-9

Cited by 20 publications

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Section: Introductionsupporting

confidence: 88%

“…Indeed, reported H 2 O content of plagioclase-hosted basal-438 M. Hamada and T. Fujii accumulation of plagioclase in the upper parts of magma chambers beneath the Izu-Oshima volcano, which required less than 0.7 wt.% H 2 O to float plagioclase in melt. Analyses of H 2 O in plagioclase-hosted melt inclusions (e.g., 1.0 wt.% on average at Izu-Oshima volcano by Kazahaya et al, 1994; 0.9 to 1.9 wt.% at Miyakejima volcano in Izu arc by Saito et al, 2005) seem to be consistent with previous suggestions of a small amount of H 2 O (~1 wt.%) in island arc basalt at the volcanic front.The question remains as to whether Ca-rich plagioclase in island arc basalt crystallized from melts with smaller amounts of H 2 O (~1 wt.%) than the values expected from Ca/Na partition equilibrium from experimental studies (up to 6 wt.%). It is possible to assume that Ca-rich plagioclase is not in equilibrium with matrix (melt) composition.…”

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confidence: 88%

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H2O-rich island arc low-K tholeiite magma inferred from Ca-rich plagioclase-melt inclusion equilibria

Hamada

Fujii

2007

Geochem. J.

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In order to quantify H 2 O content and chemical composition of island arc low-K tholeiite magma that crystallized Carich plagioclase, melt inclusions of a typical island arc tholeiite from Izu-Oshima volcano (34°N 44′, 139°E 24′) were analyzed. Composition of studied plagioclase ranges widely from An 83 to An 95 . Composition of studied melt inclusions also shows wide variation, which suggests that the melt inclusions represent various stages of crystallization differentiation at Izu-Oshima volcano. Ca/Na ratios of plagioclase-hosted melt inclusions are comparable with compositions of aphyric lava, which preclude an exotic origin for the Ca-rich plagioclase. Analyzed H 2 O content of the melt inclusions ranges from 0.2 to 2.4 wt.% (0.2 to 1.4 wt.% for plagioclase-hosted melt inclusions and 0.8 to 2.4 wt.% for olivine-hosted melt inclusions).Ca/Na partition coefficient between plagioclase and hydrous basaltic melt, K D(Ca-Na) plag-melt , is empirically calibrated based on experimental data as Based on the equilibria between host plagioclase and melt inclusion and taking effect of overgrowth into consideration, 3 to 6 wt.% H 2 O in melt is required. The lower H 2 O content of the analyzed melt inclusions is probably due to the leakage of volatiles through the host crystal during decompression, eruption and quench. Variation in estimated H 2 O content in the melt at the time of crystallization of plagioclase (3 to 6 wt.%) can be due to polybaric crystallization from H 2 O-saturated melt.Keywords: melt inclusion, Ca-rich plagioclase, island arc low-K tholeiite magma, H 2 O content in melt, hydrous melting experiment tic melt inclusions from the subaqueous Izu arc front ranges from 1 to 5 wt.% (Straub and Layne, 2003). Takagi et al. (2005) claimed that optimal H 2 O content for crystallization of Ca-rich plagioclase from island arc tholeiite magma is ~5 wt.%. However, quantitative discussions on H 2 O content of island arc basalt at the volcanic front have not reached consensus to date. Sakuyama (1979) proposed lateral variation of H 2 O content in northeast Japan arc based on the crystallization sequence and temperature, which lead to the conclusion that the H 2 O content of island arc basalt at the volcanic front was small. Aoki et al. (1981) also proposed similar lateral variations of H 2 O content based on fluorine geochemistry assuming constant proportions of K 2 O:H 2 O:F during fractional crystallization. The 1986 eruption of Izu-Oshima volcano (34°N 44′, 139°E 24′), which is a typical frontal arc volcano and issues island arc low-K tholeiite magma, stimulated the discussion on H 2 O content in island arc basalt. Aramaki and Fujii (1988) calculated the H 2 O content of basaltic melt to explain the INTRODUCTIONQuantifying the H 2 O content of island arc basalt at the volcanic front, especially island arc low-K tholeiite magma, is fundamental in understanding the generation and differentiation of magma at island arc settings. Carich plagioclase (mostly An ≥90 ), commonly found in island arc basalt at the volcan...

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Section: Introductionsupporting

confidence: 88%

supporting

confidence: 88%

H2O-rich island arc low-K tholeiite magma inferred from Ca-rich plagioclase-melt inclusion equilibria

Hamada

Fujii

2007

Geochem. J.

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“…This tholeiitic differentiation trend has been reproduced in melting experiments with anhydrous basalts at 0.1 MPa and on low-H 2 O (≤2 wt.%) basalts at low pressure (≤200 MPa; e.g., Grove and Baker 1984;Hamada and Fujii 2008;Tatsumi and Suzuki 2009;Zimmer et al 2010), which is consistent with the low H 2 O (≤2 wt.%) recorded in melt inclusions (e.g., Kazahaya et al 1994;Saito et al 2005).…”

Section: Introductionsupporting

confidence: 77%

Polybaric crystallization differentiation of H2O-saturated island arc low-K tholeiite magmas: a case study of the Izu-Oshima volcano in the Izu arc

et al. 2014

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Island arc low-K tholeiites are basaltic magmas erupting from frontal arc volcanoes of juvenile arcs associated with the subduction of old and cold plates. We investigated the origins of geochemical variation in volcanic rocks having multiple phase saturated liquid compositions from the Izu-Oshima volcano in the northern Izu arc. The geochemical variations in the liquids fall between two endmember trends, namely higher-and lower-Al/Si trends. Polybaric differentiation of H 2 O-saturated melts between a 4-km-deep magma chamber and degassed melts near the surface should be responsible for the observed variation in the liquids.

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“…On the contrary, recent melt inclusion studies (e.g. Sisson and Layne 1993;Newman et al 2000;Saito et al 2005Saito et al , 2010Ikehata et al 2010) indicated that the H 2 O content in tholeiitic basaltic melt is larger than 3 wt.% at the volcanic front.…”

Section: Introductionmentioning

confidence: 93%

“…In the case of Izu-Oshima volcano, the maximum H 2 O content of melt inclusions in the olivine phenocrysts was 3.4 wt.% by analysis of products of the older Oshima group (Ikehata et al 2010). In the case of Miyakejima volcano, Saito et al (2005Saito et al ( , 2010 analyzed melt inclusions of plagioclase and olivine phenocrysts from the AD 2000 eruption and estimated the H 2 O content to be 3.3 wt.% in olivine-hosted melt inclusions. These analyses are consistent with the values of pre-eruptive H 2 O content in melt estimated in this study.…”

Section: Pre-eruptive H 2 O Content In Arc Basalt Magmasmentioning

confidence: 99%

Water content in arc basaltic magma in the Northeast Japan and Izu arcs: an estimate from Ca/Na partitioning between plagioclase and melt

Ushioda

Takáhashi

Hamada

et al. 2014

Earth, Planets and Space

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The variation in water content of arc basaltic magmas in the Northeast Japan arc and the Izu arc was estimated using a simple plagioclase phenocryst hygrometer. In order to construct a plagioclase phenocryst hygrometer optimized for arc basalt magmas, we have conducted high-pressure melting experiments of relatively primitive basalt from the Miyakejima volcano, a frontal-arc volcano in the Izu arc. As a result of the experiments, we found that the Ca/Na partition coefficient between plagioclase and hydrous basaltic melt increases linearly with an increase in H 2 O content in the melts. We then selected from literature geochemical data sets of relatively primitive basaltic rocks with no evidence of magma mixing and the most frequent Ca-rich plagioclase phenocrysts from 15 basaltic arc volcanoes including both frontal-arc and rear-arc volcanoes. In the 15 volcanoes studied, plagioclase phenocrysts of high anorthite content (An > 90) were commonly observed, whereas plagioclase phenocrysts in rear arc volcanoes usually had a lower anorthite content (90 > An > 80). In all volcanoes studied, the estimated H 2 O content of basaltic magma was at least 3 wt.% H 2 O or higher. The magmas of volcanoes located on the volcanic front have about 5 wt.% H 2 O in magma whereas those from the rear-arc side are slightly lower in H 2 O content.

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Petrological characteristics and volatile content of magma from the 2000 eruption of Miyakejima Volcano, Japan

Abstract: Bull Volcanol (2005) 67(3): 268-280In the original online publication and the print version of this article, Tables 1 and 2 were unfortunately omitted. We apologise for this error. The tables are printed below.The online version of the original article can be found at http://dx

Cited by 20 publications

References 0 publications

H2O-rich island arc low-K tholeiite magma inferred from Ca-rich plagioclase-melt inclusion equilibria

H2O-rich island arc low-K tholeiite magma inferred from Ca-rich plagioclase-melt inclusion equilibria

Polybaric crystallization differentiation of H2O-saturated island arc low-K tholeiite magmas: a case study of the Izu-Oshima volcano in the Izu arc

Water content in arc basaltic magma in the Northeast Japan and Izu arcs: an estimate from Ca/Na partitioning between plagioclase and melt

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