Impact melting of the Cachari eucrite 3.0 GY ago

Details Impact melting of the Cachari eucrite 3.0 GY ago Impact melting of the Cachari eucrite 3.0 GY ago

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985gecoa..49..941b&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 49, April 1985, p. 941-946.

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5

Basalt, Glass, Impact Melts, Meteorites, Meteoritic Composition, Electron Microscopy, Mass Spectroscopy, Petrology, Meteorites, Eucrites, Achondrites, Stony Meteorites, Impacts, Melting, Cachari, Glass, Microprobe Methods, Neutron Activation Analysis, Ages, Chemistry, Composition, Spectrometry, Argon, Comparisons, Outgassing, Major Elements, Trace Elements, Formation, Shock, Isotopic Ratios

Scientific paper

The chemical compositions and Ar-isotope gas-retention ages of host phase and glass veins in the Cachari eucrite are determined by microprobe and neutron-activation analysis and mass spectrometry, respectively. The results are presented in tables, graphs, and back-scattered electron images and characterized in detail. The compositions are found to support the thesis that the glass formed by shock melting of the host rock (or of rock having the same composition). The Ar-39/Ar-40 ages of host and glass are given as 3.04 + or - 0.07 Gyr and 3.47 + or - 0.04 Gyr, respectively; the former value is taken as the true data of melting, and the latter is attributed to incomplete postmelt degassing of Ar from the glass phase. The implications of the relative youth of this and other eucrites and howardites for the regolith history of the parent body are considered.

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