Volcanic degassing of argon and helium and the history of crustal production on Venus

Details Volcanic degassing of argon and helium and the history of crustal production on Venus Volcanic degassing of argon and helium and the history of crustal production on Venus

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...103.3655n&link_type=abstract

Journal of Geophysical Research, vol. 103, p. 3655

Statistics

Methodology

9

Venus Surface, Volcanoes, Planetary Crusts, Degassing, Helium, Planetary Craters, Magma, Mathematical Models, Venus Atmosphere

Scientific paper

We develop a new methodology linking Ar-40 and He-4 degassing to crustal production on Venus in order to examine two different scenarios for the history of magmatism on that planet, both consistent with recent analyses of the cratering record of the Venus surface. The first scenario includes episodic global resurfacing events and modest levels of magmatism between such events, while the second scenario invokes different rates of steady magmatism before and after a given transition time. Our degassing models include distinct mantle, crustal, and atmospheric reservoirs. Diffusive transfer of Ar-40 and He-4 from the crust to the atmosphere is also taken into account. The Ar-40 abundance in the present atmosphere reflects the integrated degassing and magmatism over most of planetary history. In contrast, helium escapes from the planetary atmosphere within a characteristic residence time of 200 Myr to 1.8 Gyr, so the present atmospheric He-4 abundance is relevant to the volume of magma produced during the last global resurfacing event and the rate of the magmatism subsequent to that event under the first scenario and to the two steady rates of magmatism and the transition time under the second.

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