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Fig. 8 | Progress in Earth and Planetary Science

Fig. 8

From: Lithological structure of western Pacific lithosphere reconstructed from mantle xenoliths in a petit-spot volcano

Fig. 8

Depth–temperature diagram from geothermobarometry of ultramafic xenoliths. The detailed data are provided in Table 2. Each age-equivalent geotherm is drawn using the plate model of GDH1 (Stein and Stein 1992). a Depth and temperature of xenoliths acquired by the density of CO2 inclusions and two-pyroxene thermometer (Brey and Köhler 1990). b Depth and temperature calculated using the two-pyroxene geothermobarometer of Putirka (2008). The estimated P–T condition at which ultramafic xenoliths are hotter than the 160 Ma-geotherm of GDH1 model. Symbols are same as for Fig. 5. Error ranges for depth are within the sizes of the symbols. The pressures were converted to depths assuming the density of the seawater, oceanic crust, and mantle to be 1.023 g/cm3, 2.86 g/cm3, and 3.30 g/cm3, respectively (Carlson et al. 1988; Nayar et al. 2016; Weller et al. 2019), and thickness of the crust to be 6 km based on the seismic investigation near this study area (Kaneda et al. 2010). The depth of seafloor (i.e., thickness of seawater) was assumed to be 5600 m from each seafloor survey of research cruises in this study area

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