High Strain-Rate Deformation and Friction Melting as a Possible Origin for "Shock" Features in Allan Hills 84001

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Carbonates, Feldspars, Friction, Melting, Meteoritic Microstructures, Snc Meteorites, Metamorphism (Geology), Silicon Dioxide, Mineralogy, Pyroxenes, Sulfur Compounds, Glass

Scientific paper

Many of the debates surrounding martian meteorite ALH84001 address the questions of the temperature and age of carbonate deposition and its ultimate effect on the generation and preservation of evidence for life. To fully answer these questions, we must determine the processes that formed the textures in the meteorite and what implications these have for the environment of carbonate deposition. Discussions of the history and origins of the textures in ALH84001 have been synthesized by among others. All such histories propose the occurrence of shock melting and metamorphism for ALH84001 despite nonunique evidence for shock. Here we present an alternative mechanism for the formation of crush zones in ALH84001, which may also explain the occurrence of feldspar, silica, and carbonate melts.

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