Abstract
AbstractA major element of variability of olivine melt inclusions in Mauna Loa lavas is here proved to be strictly related to olivine crystallization at inclusion walls, at low pressure and decreasing temperature.In so doing it is probably worth it to interpret trace elements and isotope variability in these olivine trapped liquids as the effect of disequilibrium (isotope) fractionation. In this respect, the accurate analytical work performed by Sobolev et al. (2011) does not document the presence of a heterogeneous source, rather representing a tool to explore poorly documented aspects of magmatic crystallization that are controlled by the kinetics of liquid-solid phase transition.
Highlights
Results presented by Sobolev et al.[1] focus on the wide range of trace element and Sr, Nd and Pb isotope composition shown by melt inclusions found in early-liquidus, high magnesian olivines of Mauna Loa lavas
Such geochemical features are related by the Authors to “enormous mantle source heterogeneity” due to contamination by 200-650-Myr-old sea-water, occurred before subduction and recycling of ancient oceanic crust in the source of Mauna Loa rocks
Sobolev et al.[1] melt inclusions are perfectly fit by a fractionation line controlled by a Fe/Mg partition coefficient (Kd) of 0.26, while Hawaiian picrites lay on a control line fitted by Kd=0.30
Summary
Results presented by Sobolev et al.[1] focus on the wide range of trace element and Sr, Nd and Pb isotope composition shown by melt inclusions found in early-liquidus, high magnesian olivines of Mauna Loa lavas. Sobolev et al.[1] supplementary data set has been used to perform some tests with their high temperature (T>1310°C), low temperature (T
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