Fractional crystallization of the basaltic suite of Usu volcano, southwest Hokkaido, Japan, and its relationships with the associated felsic suite
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Cited by (27)
Petrology of ultramafic to mafic cumulate rocks from the Göksun (Kahramanmaraş) ophiolite, southeast Turkey
2020, Geoscience FrontiersCitation Excerpt :In contrast, plagioclase from gabbros shows zoning, with a Ca-rich core (∼An84) and a rim enriched in Na (∼An66), indicating instable chemical equilibrium within the magma chamber. The high An content of plagioclase in the ultramafic to mafic cumulates is similar to that found in suprasubduction-zone-type ophiolites in the eastern Mediterranean (Hébert and Laurent, 1990; Parlak et al., 1996, 1997, 2000, 2013b; Bağcı et al., 2005, 2006; Rızaoğlu et al., 2006) and in the arc-related igneous rocks (Arculus and Wills, 1980; Dupuy et al., 1982; Beard, 1986; Fujimaki, 1986; DeBari et al., 1987; DeBari and Coleman, 1989). The high-An plagioclase is due to high water (Arculus and Wills, 1980; Sisson and Grove, 1993; Panjasawatwong et al., 1995) and high Ca/(Ca + Na) melt contents (Panjasawatwong et al., 1995).
Whole-rock and mineral chemistry of mafic cumulates from the Low-Ti ophiolite in the southern part of Kahramanmaras, Turkey
2016, Russian Geology and GeophysicsFormation and evolution of silicic magma plumbing system: Petrology of the volcanic rocks of Usu volcano, Hokkaido, Japan
2010, Journal of Volcanology and Geothermal ResearchCitation Excerpt :On Rb–Y and Rb–Zr plots, the result can also explain the variations of the Usu volcanic rocks. However, because middle rare earth elements are compatible with hornblende at any partition coefficient of Eu, the FC model cannot produce the weak Eu-anomaly patterns of the Usu volcanic rocks in a chondrite-normalized rare earth element concentration plot (Fujimaki, 1986, Fig. 15a). In addition, the variation of matrix glass chemistry suggests the untenability of fractional crystallization (Fig. 9).
Tectonic significance of the geochemistry and petrology of ophiolites in southeast Anatolia, Turkey
2009, TectonophysicsCitation Excerpt :In this regard they are similar to the Mersin ophiolite (Parlak et al., 1996), the Pozantı-Karsantı ophiolite (Parlak et al., 2002a), the Tekirova ophiolite (Bağcı et al., 2006), the Troodos ophiolite (Hébert and Laurent, 1990), the Tonsina Complex (DeBari and Coleman, 1989), the BRUM Complex (Burns, 1985) and the Bay of Island ophiolite (Elthon et al., 1984), which are all thought to have formed in a suprasubduction zone tectonic setting. The high An content and the limited compositional range of the plagioclase in the ultramafic and mafic cumulate rocks are comparable with suprasubduction zone type ophiolites in the eastern Mediterranean (Hébert and Laurent, 1990; Parlak et al., 1996, 1997, 2000; Bağcı et al., 2005, 2006) and also to arc-related igneous rocks (Arculus and Wills, 1980; Dupuy et al., 1982; Fujimaki, 1986; Beard, 1986; DeBari et al., 1987; DeBari and Coleman, 1989). Factors commonly assumed to be responsible for the crystallization of such calcic-plagioclase include high magmatic water contents (Arculus and Wills, 1980; Sisson and Grove, 1993; Panjasawatwong et al., 1997) and high melt Ca / (Ca + Na) contents (Panjasawatwong et al., 1997).
Acid alteration in the fumarolic environment of Usu volcano, Hokkaido, Japan
2000, Journal of Volcanology and Geothermal Research