Classification of mafic clasts from mesosiderites - Implications for endogenous igneous processes

Details Classification of mafic clasts from mesosiderites - Implications for endogenous igneous processes Classification of mafic clasts from mesosiderites - Implications for endogenous igneous processes

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56..827r&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 56, Feb. 1992, p. 827-840.

Computer Science

24

Breccia, Earth Crust, Electron Probes, Igneous Rocks, Neutron Activation Analysis, Basalt, Earth Mantle, Mineralogy, Olivine, Petrography, Rare Earth Elements

Scientific paper

Results are presented from an analysis of 13 igneous pebbles from the Vaca Muerta, EET87500, and Bondoc mesosiderites, using electron microprobe and instrumental neutron activation techniques. These data, combined with literature data on compositions of 43 mesosiderite clasts were used to compile a classification scheme for the various types of mafic silicate clasts that occur in mesosiderites. These clasts were classified into five principal groups: (1) polygenic and monogenic cumulates (30 percent); (2) polygenic basalts (30 percent); (3) quench-textured rocks, comprising two compositional subgroups (those which resemble basaltic eucrites (5 percent), and those which resemble cumulate eucrites (2 percent)); (4) monogenic basalts (11 percent); and (5) ultramafic rocks, consisting mainly of large crystals of orthopyroxene (9 percent) or olivine (4 percent). The conditions under which these clasts were formed are discussed.

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