Diverse eucritic pebbles in the Vaca Muerta mesosiderite

Details Diverse eucritic pebbles in the Vaca Muerta mesosiderite Diverse eucritic pebbles in the Vaca Muerta mesosiderite

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..84....1r&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 84, no. 1, June 1987, p. 1-14.

Computer Science

15

Iron Meteorites, Meteoritic Composition, Neutron Activation Analysis, Petrography, Stony Meteorites, Electron Microscopy, Hypervelocity Impact, Mineralogy, Textures, Meteorites, Vaca Muerta, Mesosiderites, Stony-Iron Meteorites, Texture, Samples, Meteorite, Laboratory Studies, Neutron Activation Analysis, Inaa, Microprobe Methods, Petrography, Breccia, Comparisons, Element Ratios, Siderophiles, Rare Earth Elements, Concentration, Silica, Shock Effects, Iridium, Merrillite, Annealing, Impacts, Melting, Hypot

Scientific paper

Seven 5-cm basaltic pebbles from the Vaca Muerta mesosiderite were studied by neutron activation and electron microprobe analysis, and three additional pebbles were studied petrographically. The cumulate pebbles had low REE concentrations and high Eu/Sm ratios, indicating the absence of intercumulus liquid. Siderophile interelement ratios were similar to those found in Vaca Muerta metal except for anomalously low Ir concentrations. The presence of 20 percent impact-melt breccias among the pebbles and 35-40 percent melt breccias among the mesosiderite whole-rocks suggests that the mesosiderites were more extensively impact melted than the howardites. Three alternative models to explain this greater proportion of impact-melted material among the mesosiderites are proposed.

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