Origin of andesitic magma in Yufu-Tsurumi volcano group. A binary mixing model.

Ohta, Takehiro; Aoki, Kenichiro

doi:10.2465/ganko.86.1

Cited by 7 publications

(5 citation statements)

References 40 publications

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“…5 and Fig. S4, Ohta et al, 1990;Ohta and Aoki, 1991). Furthermore, this negative correlation cannot be generated by crustal assimilation, since the partial melt of a crust is SiO2-rich melt (e.g.…”

Section: Major and Trace Element Composition Of The Primitive Magmamentioning

confidence: 99%

“…Whole rock sample descriptions are from the literature and brief descriptions are summarized here: YF1L is a mafic enclave found in a Nonokusa pyroclastic-flow deposit on the southern slope of the edifice (Ohta et al, 1990;Okuno et al, 1999), which is interpreted as being equivalent to the mafic endmember of the Yufu-Tsurumi volcanic group (Ohta and Aoki, 1991). The olivine-bearing mafic blocks are typically vesiculated augite-hornblende-plagioclase basalt to basaltic andesite.…”

Section: Sample Descriptionmentioning

confidence: 99%

“…Reported whole rock compositions of Kyushu Island volcanic rocks are shown as small solid circles for comparison: pink, volcanic rocks along the volcanic front; grey, other volcanic rocks of Kyushu. WR data: Sawamura and Matsui, 1957;Shinno, 1966;Nakamura, 1971;Nakada, 1986;Nakada and Kamata, 1988;Kakubuchi and Matsumoto, 1990;Ohta et al, 1990, 1992, Ohta and Aoki, 1991Iwamori et al, 1991Iwamori et al, , 1992Nagao et al, 1992;Kakubuchi et al, 1995;Imura and Kobayashi, 2001;Kita et al, 2001Kita et al, , 2012Uto et al, 2004;Kawanabe and Sakaguchi, 2005;Sugimoto et al, 2005Sugimoto et al, , 2006Miyoshi et al, 2005Miyoshi et al, , 2008aMiyoshi et al, , b, 2010Miyoshi et al, , 2011Sakuyama et al, 2009Sakuyama et al, , 2014Hoang et al, 2013;Tajima et al, 2013Tajima et al, , 2014Shibata et al, 2013Shibata et al, , 2014Kawanabe et al, 2015;Yamasaki et al, 2016;Kuritani et al, 2017;Brown et al, 2020;Nche et al, 2021. Composition of the primitive mantle is taken from Sun and McDonough (1989).…”

Section: Figure Captionsmentioning

confidence: 99%

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Sulfur Isotope and Trace Element Systematics in Arc Magmas: Seeing through the Degassing via a Melt Inclusion Study of Kyushu Island Volcanoes, Japan

Kawaguchi

Koga

Rose-Koga

et al. 2022

Journal of Petrology

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Sulfur is a minor element in magmas but one of the major volatile elements released in volcanic systems, from the magma to the fluid phase upon ascent. Not only are sulfur gases potentially toxic for humans and plants, they are also involved in causing drastic climate changes after major volcanic eruptions. Therefore, studies are carried out by the geoscience community to assess the magmatic sulfur flux by looking at the sulfur content and isotopes in erupted products, with the ultimate aim of improving understanding of the sulfur cycle in subduction zones. Kyushu island in Japan hosts 25 volcanoes among which 11 are active and represent a natural hazard for the local population. It is perhaps the most suitable site for the study of the sulfur cycle for its availability of recent volcanic deposits and its many, highly monitored volcanoes. We investigated sulfur and sulfur isotope compositions of the magma source of Kyushu Island arc using olivine-hosted melt inclusions in mafic tephras and lavas, from 8 volcanoes (9 Holocene samples) going from Northern Kyushu with Oninomi, Yufu, Kuju, and Aso, to Southern Kyushu volcanoes such as Kirishima-Ohachidake, Kirishima-Shinmoedake, Sumiyoshi-ike, and Kaimondake, and one back arc volcano, Fukue-Onidake. We measured major, trace and volatile elements and S isotopes (δ34S) in melt inclusions. Magma composition recorded in the inclusions ranges from basalt to andesite (SiO2 ranging from 40.3 to 60.7 wt. %). For each edifice, we identified the least degassed and least differentiated compositions based on volatile and trace element systematics, and selected the melt inclusions closest to their primitive melts. Comparing these primitive magmas, Sr/Y underlines a compositional dichotomy between volcanoes from northern (Sr/Y>20) and southern Kyushu (Sr/Y<20), separated by a non-volcanic area corresponding to the subduction of the Kyushu-Palau ridge. The δ34S in melt inclusions range from -0.32±0.79 ‰ to +9.43±0.47 ‰ (2σ) and trace the source of the magma from the different volcanoes, rather than degassing or crustal fractionation processes. δ34S is not fractionated by the nature of the fluid (aqueous or melt) metasomatizing the mantle wedge, therefore it is not the first order factor controlling the sulfur isotope variations. Instead, this study illustrates the need for a heavy δ34S component, likely sulfate from seawater, contained in the agent that metasomatized the mantle beneath the arc. If such an observation is confirmed in other subduction zones, sulfur isotopes in melt inclusions may be an effective way to trace seawater input into the mantle beneath arcs.

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Section: Major and Trace Element Composition Of The Primitive Magmamentioning

confidence: 99%

Section: Sample Descriptionmentioning

confidence: 99%

Section: Figure Captionsmentioning

confidence: 99%

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Sulfur Isotope and Trace Element Systematics in Arc Magmas: Seeing through the Degassing via a Melt Inclusion Study of Kyushu Island Volcanoes, Japan

Kawaguchi

Koga

Rose-Koga

et al. 2022

Journal of Petrology

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“…Particularly in arc-type volcanic rocks many discussions have been focused on the genesis of the regional scale isotope variations (e.g., DePaolo and Joh nson, 1979;Hawkesworth et al, 1979;McCul loch and Perfit, 1981;Nohda and Wasserburg , 1981;Notsu, 1983;Arculus and Powell , 1986;Ellam and Hawkesworth, 1988;Stern et al ., 1991). The isotopic heterogeneities have been revealed even in the rocks of a single volcano or of one eruptive stage of a volcano, and were often interpreted as reflecting the heterogene ous mixing between two component magmas with different isotope and chemical composi tions (e.g., Ikeda et al, 1985;Flood et al, 1989;Nakagawa, 1985;Ota and Aoki, 1991;Ujike and Ito, 1991). For the complex history of magma evolutions involving these heteroge neous mixing, the determination of isotope compositions of phenocryst minerals (mega crysts) and the comparison with those of sur Isshiki (1960Isshiki ( , 1964Isshiki ( , 1977Isshiki ( , 1984).…”

Section: Introductionmentioning

confidence: 99%

Strontium isotope compositions of anorthite and olivine phenocrysts in basaltic lavas and scorias of Miyakejima volcano, Japan.

Arakawa

Murakami

Kimata

et al. 1992

J. Min. Petr. Econ. Geol.

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Sr isotope compositions were determined for anorthite megacrysts, olivine phenocrysts and host basalts of Miyakejima volcano, Izu-Ogasawara arc, Japan. The anorthite megacrysts are of An97-94 in composition. The olivine phenocrysts have almost the same composition (Fo84-82) as olivine inclusions in the anorthite megacrysts.The 87Sr/86Sr ratios of anorthites range within a narrow variation of 0.70340-0.70352, while those of olivine phenocrysts and olivine inclusions show distinctively higher values (0.70357-0.70374) than those of anorthites. Host rock samples excluding megacrysts yield intermediate 87Sr/86Sr values between anorthite and olivine . This disequilibrium in 87Sr/86Sr ratios between phenocrysts and host rocks demonstrates that anorthites and olivines did not crystallize directly from the host magmas but were probably xenocrysts carried up by the magmas. The present data further suggest that the olivine phenocrysts and olivine inclusions in anorthite megacrysts have the same origin and that the crystallization of anorthite occurred posterior to olivine crystallization. The difference in 87Sr/86Sr ratios between olivine inclusions and host anorthite megacrysts provide an evidence for magma mixing between two types of magmas (both of basaltic in composition) with different 87Sr/86Sr ratios. The basaltic magmas which formed the Miyakejima volcano may also be explained by the mixing of above two end member magmas, at least in some stage (or stages) of magma evolution.

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“…The volcanic activity of the YTV began before 60000 yBP and continued until some time after 7300 cal BP (Kobayashi, 1984;Hoshizumi et al, 1988;Ohta et al, 1990;Fujisawa et al, 2002). Ohta and Aoki (1991) suggested that magma mixing has played an important role in the magma evolution of the YTV based on the trace element content, 87 Sr/ 86 Sr isotopic behavior, and mineralogical evidence. They argued that mixing endmembers were represented by basaltic inclusions, which are generally contained in the YTV (Ohta et al, 1990), and dacite from adjacent older volcanoes.…”

Section: Introductionmentioning

confidence: 99%

Sr-Nd-Pb isotopic and major and trace element compositions of the Yufu-Tsurumi volcanic rocks: implications for the magma genesis of the Yufu-Tsurumi volcanoes, northeast Kyushu, Japan

Sugimoto

Shibata

Yoshikawa

et al. 2006

Journal of Mineralogical and Petrological Sciences

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We have characterized the Sr Nd Pb isotopes and major and trace element compositions of 10 Quaternary volcanic rocks from the Yufu and Tsurumi volcanoes in northeast Kyushu, Japan. The enriched incompatible elements, negative Nb, and positive Pb and Sr anomalies are generally interpreted to be from island arc affinities of the lavas. However, the LREE/HREE ratio of the lavas (La/Yb = 8.5 ± 1.3) is greater than that from the island arc intermediate volcanics from northeast Japan (La/Yb = 3.8 ± 0.6), suggesting a different origin. Sr compositions fell within the range of typical adakites. Other lavas were classified as normal island arc type magmas. These results suggest that a partial melting of the subducting Philippine Sea Plate played a role in the genesis of the Yufu Tsurumi volcanic rocks. The Sr, Nd, and Pb isotopic compositions show evidence of mixing between melts, derived from oceanic basaltic crust and subducted terrigenous sediments for the adakite magma, whereas another source is required to explain the enrichment in Sr Nd isotopes and depletion in Pb isotopes of the island arc type magma. Although the island arc type magma appears to have a different source, a mixing of the adakite magma with this magma is apparent from our observations of the trace elements and isotopes.

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Origin of andesitic magma in Yufu-Tsurumi volcano group. A binary mixing model.

Cited by 7 publications

References 40 publications

Sulfur Isotope and Trace Element Systematics in Arc Magmas: Seeing through the Degassing via a Melt Inclusion Study of Kyushu Island Volcanoes, Japan

Sulfur Isotope and Trace Element Systematics in Arc Magmas: Seeing through the Degassing via a Melt Inclusion Study of Kyushu Island Volcanoes, Japan

Strontium isotope compositions of anorthite and olivine phenocrysts in basaltic lavas and scorias of Miyakejima volcano, Japan.

Sr-Nd-Pb isotopic and major and trace element compositions of the Yufu-Tsurumi volcanic rocks: implications for the magma genesis of the Yufu-Tsurumi volcanoes, northeast Kyushu, Japan

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