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Progress in Earth and Planetary Science
Fig. 6 | Progress in Earth and Planetary Science

Fig. 6

From: Formation of lower fast-spread oceanic crust: a structural and geochemical study of troctolites in the Hess Deep Rift (East Pacific Rise)

Fig. 6

Chemical compositions of minerals in the troctolites from IODP Site U1415. Each data point represents the mean value of one sample along with measured variability (1 standard deviation). Compositional change during fractional crystallization of primitive MORB melt calculated by rhyolite-MELTS software package is shown by the black dots in (a). Calculated data are plotted in each 1 ºC decrease. Crystalline mineral pairs are shown. The chemical compositions of plagioclase-bearing dunites, dunites, and harzburgites from Hess Deep are from Arai and Matsukage (1996) and Dick and Natland (1996); those of olivine gabbros from Hess Deep are from Lissenberg et al. (2013); those of troctolites from the Atlantis Bank are from Dick et al. (2002) (data name of OZA and MAE were used herein); and those of troctolites from the Atlantis Massif are from Drouin et al. (2009) and Ferrando et al. (2018). AB Atlantis Bank, AM Atlantis Massif, CGT Coarse-grained troctolite, Cpx Clinopyroxene, Du Dunite, FGT Fine-grained troctolite, Gab Gabbro, HD Hess Deep, Hz Harzburgite, Ol Olivine, Pl Plagioclase, Pl du Plagioclase-bearing dunite, SOBT Skeletal olivine-bearing troctolite, Tro Troctolite

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