Venus - Chemical weathering of igneous rocks and buffering of atmospheric composition

Details Venus - Chemical weathering of igneous rocks and buffering of atmospheric composition Venus - Chemical weathering of igneous rocks and buffering of atmospheric composition

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982sci...216..181n&link_type=abstract

Science, vol. 216, Apr. 9, 1982, p. 181-183. NASA-supported research.

Computer Science

34

Atmospheric Composition, Buffers (Chemistry), Igneous Rocks, Pioneer Venus Spacecraft, Venus Atmosphere, Venus Surface, Weathering, Altitude, Atmospheric Chemistry, Calcium Compounds, Gas-Solid Interactions, Radar Maps, Venera Satellites, Wind Erosion, Wind Velocity Measurement, Venus, Chemistry, Weathering, Rocks, Atmosphere, Composition, Data, Pioneer Venus, Radar Observations, Winds, Velocity, Surface, Erosion, Mineralogy, Earth-Based Observations, Venera, Altitude

Scientific paper

Data from the Pioneer Venus radar mapper, combined with measurements of wind velocity and atmospheric composition, suggest that surface erosion on Venus varies with altitude. Calcium- and magnesium-rich weathering products are produced at high altitudes by gas-solid reactions with igneous minerals, then removed into the hotter lowlands by surface winds. These fine-grained weathering products may then rereact with the lower atmosphere and buffer the composition of the observed gases carbon dioxide, water vapor, sulfur dioxide, and hydrogen fluoride in some regions of the surface. This process is a plausible mechanism for the establishment in the lowlands of a calcium-rich mineral assemblage, which had previously been found necessary for the buffering of these species.

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