Carbonates in magma

Aragonite in olivine from Calatrava, Spain—Evidence for mantle carbonatite melts from >100 km depth.

geology.gsapubs.org

Aragonite, as an inclusion in olivine from a leucitite lava flow, provides evidence for high-pressure crystallization and carbonatitic activity beneath the geophysical lithosphere in Calatrava, Spain. The aragonite occurs as a single crystal within olivine (...

Cool for 2 reasons. 1) The entire paper and all the conclusions about the upper mantle is based on analysis of one grain of olivine, probably less than a mm in diameter. 2) Aragonite can be a weathering product of olivine, I wonder if it is possible that the aragonite crystal is the result of some kind of phyllosilicate weathering reaction? Occams razor says that this paper has exagerated conclusions, but I am always amazed when a geologist predicts an economic deposit from one grain in a piece of core.