PrefaceMajorite fractionation and genesis of komatiites in the deep mantle
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Cited by (49)
<sup>182</sup>W and HSE constraints from 2.7 Ga komatiites on the heterogeneous nature of the Archean mantle
2018, Geochimica et Cosmochimica ActaCitation Excerpt :Due to the rather wide geographical distribution and specific geochemical features of these lavas, Barley et al. (2000) coined the term Karasjok-type komatiites after the locality in Norway where they were first described by Barnes and Often (1990). The majority of models proposed to account for the origin of the Karasjok-type komatiites (Capdevila et al., 1999; Tomlinson et al., 1999; Barley et al., 2000) involve deep, high-degree anhydrous melting in mantle plumes in equilibrium with residual majorite garnet, typical of Al-depleted komatiites (Ohtani, 1984, 1990; Herzberg and Ohtani, 1988). This is consistent with estimates of the pressure of melting for the BCF to be between 10 and 14 GPa (Herzberg and O'Hara, 2002), which is similar to that of the Barberton komatiites.
Earth's Oldest Rocks
2018, Earth's Oldest RocksPetrogenesis of 3.15 Ga old Banasandra komatiites from the Dharwar craton, India: Implications for early mantle heterogeneity
2017, Geoscience FrontiersCitation Excerpt :In this modelling the residue is taken to be garnet free indicating that the melting is at pressures lower than 5 GPa (Takahashi and Scarfe, 1985) where garnet is not a stable phase. However, this does not preclude the possibility of earlier episodes of melting at deeper depths leaving garnet as residue, consistent with the suggestion that AUK are generated after extraction of ADK in Archean (Ohtani, 1990; Robin-Popieul et al., 2012). We do see contribution of the deeper melts in our samples in terms of slight negative trend of (Gd/Yb)N versus Al2O3/TiO2.
Geochemistry of contaminated komatiites from the Umburanas greenstone belt, Bahia State, Brazil
2015, Journal of South American Earth Sciences