LPI Seminar Series
Effective January 1, 2011, LPI seminars will be held on Fridays.
LPI seminars are held from 3:30–4:30 p.m. in the Lecture Hall at USRA, 3600 Bay Area Boulevard, Houston, Texas. Refreshments are served at 4:30 p.m. For more information, please contact Nicolas LeCorvec (phone: 281-486-2118; e-mail: email@example.com) or Paul Byrne (phone: 281-486-2140; e-mail: firstname.lastname@example.org). A map of the Clear Lake area is available here. This schedule is subject to revision.
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- Friday, March 6, 2015 - Lecture Hall, 3:30 PM
Walter Kiefer, Lunar and Planetary Institute
Preservation of Isotopic Heterogeneity in a Convecting Martian Mantle
The existence of volcanic activity on Mars in the last 200 million years is demonstrated by both the low crater densities on volcanos such as Olympus Mons and by radiometric dating of the shergottite meteorites. This implies the existence of adiabatic decompression melting and thus an actively convecting mantle. On the other hand, the preservation of isotopically distinct reservoirs that formed in the first 100 million years of solar system history has been interpreted by some investigators as evidence that the martian mantle cannot be convecting. This apparent paradox can be resolved by considering the effects of geographic isolation of isotopic reservoirs and of inefficient convective mixing, which together allow geochemical reservoirs to be preserved within a convecting martian mantle.