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Progress in Earth and Planetary Science
Fig. 5 | Progress in Earth and Planetary Science

Fig. 5

From: Geochemical characteristics of back-arc basin lower crust and upper mantle at final spreading stage of Shikoku Basin: an example of Mado Megamullion

Fig. 5

Bulk major-element compositions (in wt%). The black and blue arrows represent reaction trends between oxide gabbroic melt–peridotite, and gabbroic melt–peridotite, respectively. The background data represent bulk compositions of dolerite, oxide gabbro, gabbro, olivine gabbro, and troctolite from fore-arc region (Mortimer et al. 1998; Meffre et al. 2012; Falloon et al. 2014; Johnson et al. 2014), fast-spreading East Pacific Rise (EPR) (Pedersen et al. 1996; Natland and Dick 2009), slow-spreading Mid-Atlantic Ridge (MAR) (Godard et al. 2009), and ultraslow-spreading Southwest Indian Ridge (SWIR) (PetDB database: Lehnert et al. 2000). Compositional data of peridotites are from fore-arc region (Parkinson and Pearce 1998; Pearce et al. 2000; Birner et al. 2017), fast- to intermediate-spreading MOR (Niu and Hékinian 1997; Regelous et al. 2016; Niu 2004), slow-spreading MOR (Niu 2004; Regelous et al. 2016), and ultraslow-spreading MOR (Niu 2004; Regelous et al. 2016). Primitive upper mantle (PUM) data are from Jagoutz et al. (1979), Palme and Nickel (1985), Hart and Zindler (1986), and McDonough and Sun (1995). Abbreviations: Dol = dolerite, Du = dunite, Ga = gabbro, Ol ga = olivine gabbro, Ox ga = oxide gabbro, and Pe = peridotite

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