Evolution of Deeper Basaltic and Shallower Andesitic Magmas during the AD 1469-1983 Eruptions of Miyake-Jima Volcano, Izu- Mariana Arc: Inferences from Temporal Variations of Mineral Compositions in Crystal-Clots

Amma-Miyasaka, Mizuho

doi:10.1093/petrology/egg072

Cited by 28 publications

(15 citation statements)

References 40 publications

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“…2). Our results are consistent with those of previous studies (Takahashi et al, 1991;Watanabe et al, 2006;Kawanabe, 1991;Amma-Miyasaka and Nakagawa, 2003;Amma-Miyasaka et al, 2005;Koyaguchi, 1986;Yamamoto et al, 1991). Figure 2 shows correlation diagrams of SiO 2 with other major elements.…”

Section: Geochemistry Of the Samplessupporting

confidence: 93%

238U-230Th radioactive disequilibrium in the northern Izu arc: (230Th/232Th) in the sub-arc mantle

et al. 2008

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Major and trace element abundances, Sr and Nd isotopic ratios, and 238 U-230 Th radioactive disequilibria have been analyzed for samples from five volcanoes, Oshima, Miyakejima, Niijima, Teishi Knoll and Fuji, located in the northern Izu arc to investigate across-arc and regional variations of chemical compositions of mantle and fluids expelled from a subducting slab. The abundances and abundance ratios of both fluid mobile and immobile trace elements show across-arc variations.All samples but one have radioactive disequilibria, with ( 238 U/ 230 Th) greater than unity (herein, a ratio in parentheses denotes the activity ratio). The observed disequilibrium is similar to those reported for other arc systems, such as Mariana, Tonga, Kermadec, Chile. It originates from higher mobility of uranium relative to thorium during dewatering of the subducting slab. Th) contributed from sediment melt, which dominates the budget of Th in the sub-arc mantle. It also suggests that influence of fluid addition before the final one had not caused a variation in Th isotopic compositions of the sub-arc mantle.

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Section: Geochemistry Of the Samplessupporting

confidence: 93%

238U-230Th radioactive disequilibrium in the northern Izu arc: (230Th/232Th) in the sub-arc mantle

et al. 2008

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“…15, 17, 19). In the case of constant eruption rate volcanoes (Izu-Oshima and Miyakejima), magma compositions differed over 10-100 year intervals (Nakano and Yamamoto 1991;Amma-Miyasaka and Nakagawa 2003). We speculate that these high eruption rates are probably maintained by frequent replenishment by variably differentiated magmas from a parental source.…”

Section: Discussionmentioning

confidence: 86%

Temporal variations in volumetric magma eruption rates of Quaternary volcanoes in Japan

Yamamoto

Kudo

Isizuka

2018

Earth Planets Space

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Long-term evaluations of hazard and risk related to volcanoes rely on extrapolations from volcano histories, including the uniformity of their eruption rates. We calculated volumetric magma eruption rates, compiled from quantitative eruption histories of 29 Japanese Quaternary volcanoes, and analyzed them with respect to durations spanning 10 1 -10 5 years. Calculated eruption rates vary greatly (10 1 -10 −4 km 3 dense-rock equivalent/1000 years) between individual volcanoes. Although large basaltic stratovolcanoes tend to have high eruption rates and relatively constant repose intervals, these cases are not representative of the various types of volcanoes in Japan. At many Japanese volcanoes, eruption rates are not constant through time, but increase, decrease, or fluctuate. Therefore, it is important to predict whether eruption rates will increase or decrease for long-term risk assessment. Several temporal co-variations of eruption rate and magmatic evolution suggest that there are connections between them. In some cases, magma supply rates increased in response to changing magma-generation processes. On the other hand, stable plumbing systems without marked changes in magma composition show decreasing eruption rates through time.

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“… Amma‐Miyasaka et al [2005], who carried out petrological studies on volcanic rocks resulting from eruptions over the past 500 years, concluded that shallow andesitic and deeper basaltic magmas successively erupted from different craters. Many geophysical [ Sakai et al , 2001; Furuya et al , 2003; Nakada et al , 2005; Uhira et al , 2005] and petrological [ Amma‐Miyasaka and Nakagawa , 2003; Amma‐Miyasaka et al , 2005] studies have suggested that the depths of the andesitic and basaltic magma chambers are 3–5 km and about 10 km below sea level, respectively. Kaneko et al [2005] suggested that the basaltic magma was injected into the shallow magma chamber and mixed with the basaltic andesite magma before the submarine eruption: a suggestion that is based on the wide range of Cl contents in the melt inclusions in the plagioclase of the 27 June submarine spatter.…”

Section: Outline Of the 2000 Eruption Of Miyakejima Volcanomentioning

confidence: 99%

Magma plumbing system of the 2000 eruption of Miyakejima volcano, Japan, deduced from volatile and major component contents of olivine‐hosted melt inclusions

Saito¹,

Morishita²,

Shinohara³

2010

J. Geophys. Res.

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[1] Chemical analyses of 56 olivine-hosted melt inclusions and their host olivines from the explosive eruption of Miyakejima volcano, Japan, on 18 August 2000 were carried out by electron probe micro analyzer and secondary ion mass spectrometry in order to investigate the magma plumbing system of the eruption. The bimodal olivine core composition, relatively small rims, and diffusion profiles of the Mg-rich olivines indicate the mixing of evolved magma and less-evolved magma in 2 months before the eruption. The major element composition of the Mg-poor olivine-hosted melt inclusions (Mg-poor OLMIs) is similar to that of the groundmass. The Mg-rich olivine-hosted melt inclusions (Mg-rich OLMIs) have a SiO 2 -and K 2 O-poor but Al 2 O 3 -and CaO-rich composition, compared to the whole-rock composition of the products. Most of the Mg-rich OLMIs have slightly higher H 2 O (1.9-3.5 wt %) and S (0.06-0.21 wt %) contents and a lower Cl (0.04-0.07 wt %) content than the Mg-poor OLMIs, whereas they have similar CO 2 (0.003-0.025 wt %) content. These results suggest that CO 2 -rich gas was added to the evolved magma in a shallow magma chamber, followed by decompression degassing in a pressure range of 30-80 MPa and the rapid ascent of the less-evolved magma from a deep magma chamber up to a depth of about 2 km. The ratios of the H 2 O and S contents of the Mgrich OLMIs are similar to that of the volcanic gas emitted from the summit after the 2000 eruption, which suggests shallow degassing of the less-evolved magma in the conduit since the eruption.Citation: Saito, G., Y. Morishita, and H. Shinohara (2010), Magma plumbing system of the 2000 eruption of Miyakejima volcano, Japan, deduced from volatile and major component contents of olivine-hosted melt inclusions,

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Evolution of Deeper Basaltic and Shallower Andesitic Magmas during the AD 1469-1983 Eruptions of Miyake-Jima Volcano, Izu- Mariana Arc: Inferences from Temporal Variations of Mineral Compositions in Crystal-Clots

Cited by 28 publications

References 40 publications

238U-230Th radioactive disequilibrium in the northern Izu arc: (230Th/232Th) in the sub-arc mantle

238U-230Th radioactive disequilibrium in the northern Izu arc: (230Th/232Th) in the sub-arc mantle

Temporal variations in volumetric magma eruption rates of Quaternary volcanoes in Japan

Magma plumbing system of the 2000 eruption of Miyakejima volcano, Japan, deduced from volatile and major component contents of olivine‐hosted melt inclusions

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