Method, instruments, and results of the determination of elements contained in Venusian rock by the Vega-2 interplanetary probe

Details Method, instruments, and results of the determination of elements contained in Venusian rock by the Vega-2 interplanetary probe Method, instruments, and results of the determination of elements contained in Venusian rock by the Vega-2 interplanetary probe

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986avest..19..275s&link_type=abstract

(Astronomicheskii Vestnik, vol. 19, Oct.-Dec. 1985, p. 275-288) Solar System Research (ISSN 0038-0946), vol. 19, no. 4, April 19

Computer Science

Databases

Petrology, Planetary Composition, Planetary Geology, Rocks, Vega Project, Venus Surface, Anorthosite, Geochemistry, X Ray Fluorescence, X Ray Spectroscopy

Scientific paper

The techniques used and the results obtained with use of the X-ray fluorescent spectrometer on the Vega-2 lander to determine the chemical composition of the surrounding Venusian rocks are described. The landing took place in the northeastern part of Terra Aphroditae in June 1985. Rock samples were taken into a chamber on the probe and irradiated with radioisotope sources (Pu-238 and Fe-55). The characteristic radiation emitted by the exposed samples were counted by X-ray detectors. Each spectrum took 190 sec to complete. A library of standard rocks and associated counting databases were assembled for comparative analysis of the telemetered data. Good matches were found with terrestrial troctolite and anorthosite rocks, corresponding to magmatic and tectonic stages of planetary development. Comparisons are made with surface materials detected on Mars and the moon. The data indicate that the earth once had a feldspar surface.

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