Thermal alteration of organic matter in an impact crater and the duration of postimpact heating

Details Thermal alteration of organic matter in an impact crater and the duration of postimpact heating Thermal alteration of organic matter in an impact crater and the duration of postimpact heating

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005geo....33..373p&link_type=abstract

Geology, vol. 33, Issue 5, p.373

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18

Scientific paper

The 24-km-diameter Tertiary Haughton impact structure formed in rocks that contained preexisting liquid hydrocarbons. Biomarker ratios in the hydrocarbons show a consistent pattern of variation in degree of heating across the structure. The heating reached a maximum at the crater center and is attributed to hydrothermal activity following impact. Kinetic modeling suggests a time scale of ˜5 k.y. for the heating, at a maximum temperature of 210 °C. The short time scale suggests that in moderate-sized craters, which are abundant on Mars, heating is not so extensive that fossil or extant organic matter would be obliterated.

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