Combining meteorites and missions to explore Mars
- 3 October 2011
- journal article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences of the United States of America
- Vol. 108 (48), 19159-19164
- https://doi.org/10.1073/pnas.1013478108
Abstract
Laboratory studies of meteorites and robotic exploration of Mars reveal scant atmosphere, no evidence of plate tectonics, past evidence for abundant water, and a protracted igneous evolution. Despite indirect hints, direct evidence of a martian origin came with the discovery of trapped atmospheric gases in one meteorite. Since then, the study of martian meteorites and findings from missions have been linked. Although the meteorite source locations are unknown, impact ejection modeling and spectral mapping of Mars suggest derivation from small craters in terrains of Amazonian to Hesperian age. Whereas most martian meteorites are young (< 1.3 Ga), the spread of whole rock isotopic compositions results from crystallization of a magma ocean > 4.5 Ga and formation of enriched and depleted reservoirs. However, the history inferred from martian meteorites conflicts with results from recent Mars missions, calling into doubt whether the igneous histor y inferred from the meteorites is applicable to Mars as a whole. Allan Hills 84001 dates to 4.09 Ga and contains fluid-deposited carbonates. Accompanying debate about the mechanism and temperature of origin of the carbonates came several features suggestive of past microbial life in the carbonates. Although highly disputed, the suggestion spurred interest in habitable extreme environments on Earth and throughout the Solar System. A flotilla of subsequent spacecraft has redefined Mars from a volcanic planet to a hydrologically active planet that may have harbored life. Understanding the history and habitability of Mars depends on understanding the coupling of the atmosphere, surface, and subsurface. Sample return that brings back direct evidence from these diverse reservoirs is essential.Keywords
This publication has 67 references indexed in Scilit:
- Elemental Composition of the Martian CrustScience, 2009
- The case for old basaltic shergottitesEarth and Planetary Science Letters, 2007
- Ejection of Martian meteoritesMeteoritics & Planetary Science, 2005
- Phase equilibria of the Shergotty meteorite: Constraints on pre‐eruptive water contents of martian magmas and fractional crystallization under hydrous conditionsMeteoritics & Planetary Science, 2001
- An Evaporation Model for Formation of Carbonates in the ALH84001 Martian MeteoriteInternational Geology Review, 1998
- Low-Temperature Carbonate Concretions in the Martian Meteorite ALH84001: Evidence from Stable Isotopes and MineralogyScience, 1997
- A possible high-temperature origin for the carbonates in the martian meteorite ALH84001Nature, 1996
- Record of fluid–rock interactions on Mars from the meteorite ALH84001Nature, 1994
- The discovery and initial characterization of Allan Hills 81005: The first lunar meteoriteGeophysical Research Letters, 1983
- Basaltic MeteoritesScientific American, 1980