An ultramafic volcanic rock whose inferred magnesium-rich parental liquids constrain high-temperature mantle melting; mantle plume and ambient mantle interpretations must be distinguished.
A texture with elongate or skeletal crystals, commonly olivine, in some ultramafic lavas. It records crystal growth and cooling conditions and supports interpretation of a lava's crystallization history. It is not alone a numerical thermometer for ambient mantle potential temperature.
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