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Science 29 August 1997:
Vol. 277. no. 5330, pp. 1289 - 1294
DOI: 10.1126/science.277.5330.1289
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Reports

Corona Formation and Heat Loss on Venus by Coupled Upwelling and Delamination

Suzanne E. Smrekar, * Ellen R. Stofan

Coronae are volcanotectonic features that are unique to Venus and are interpreted to be small-scale upwellings. A model in which upwelling causes delamination at the edge of the plume head, along with deformation of a preexisting depleted mantle layer, produced the full range of topographic forms of coronae. If half of the coronae are active, delamination of the lower lithosphere could account for about 10 percent of Venus' heat loss, with another 15 percent due to upwelling. Delamination may occur in other geologic environments and could account for some of Venus' heat loss "deficit."

Jet Propulsion Laboratory, California Institute of Technology, MS 183-501, 4800 Oak Grove Drive, Pasadena, CA 91109, USA.
*   To whom correspondence should be addressed.

Volume 277, Number 5330, Issue of 29 August 1997, pp. 1289-1294
©1997 by The American Association for the Advancement of Science.

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