The parent magmas of the SNC meteoritesMineral compositions, partition coefficients, and computer-graphic representations of liquidus phase boundaries are used here to calculate parent magma compositions for Nakhla, Chassigny, and the xenocryst assemblage in EETA79001B, ALHA77005, and the EETA79001A groundmass. The calculated SNC parent magma compositions have low concentrations of Al2O3 and widely varying wollastonitite (CaO) component. In this regard they resemble basaltic komatiites, but their range of Wo is more extensive than that of basaltic komatiites and trace element characteristics are different. The calculated Nakhla parent magma has an unusually high Wo content and does not resemble any other known magmatic composition. A model of SNC petrogenesis is proposed.
Document ID
19890049153
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Longhi, J. (Lamont-Doherty Geological Observatory Palisades, NY, United States)
Pan, V. (Yale University New Haven, CT, United States)