Abstract
In an attempt to investigate metasomatic processes in the subcontinental upper mantle beneath Northern Patagonia, melt and fluid inclusions trapped in spinel lherzolite and harzburgite xenoliths have been studied. The xenoliths contain three types of genetically related inclusions hosted by olivine, orthopyroxene, clinopyroxene and spinel: silicate glass inclusions, multiphase silicate melt inclusions and C02 fluid inclusions. CO2 densities of early fluid inclusions (0.93–1.02 g/cm3) and homogenization temperatures of melt inclusions (1220 °C) indicate that they were trapped at uppermantle depths.
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