Jarosite, argon diffusion, and dating aqueous mineralization on Earth and Mars

Details Jarosite, argon diffusion, and dating aqueous mineralization on Earth and Mars Jarosite, argon diffusion, and dating aqueous mineralization on Earth and Mars

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011e%26psl.310..314k&link_type=abstract

Earth and Planetary Science Letters, Volume 310, Issue 3, p. 314-318.

Mathematics

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1

Jarosite, Argon Diffusion, Mars, Thermochronology, Dating Aqueous Environments

Scientific paper

Jarosite 40Ar/39Ar ages can be used to date surface processes such as weathering and environmental transitions (i.e. aridification) on Earth and Mars. To better interpret jarosite ages from a thermochronological perspective, the diffusion kinetics of argon in jarosite were determined. Incremental fractional loss measurements indicate an activation energy (E) of 37.8 ± 1.5 kcal/mol and a log Do/a2 of 5.68 ± 0.63 s- 1 corresponding to a closure temperature of 143 ± 28 °C, assuming a cooling rate 100 °C/Ma. Downward extrapolation of these parameters to Martian surface temperatures (≤ 22 °C) predicts < 1% fractional loss of Ar over 4.0 Ga. Forward modeling of 40Ar/39Ar age spectra using the least retentive E, Do/a2 pairs predict that if held at 22 °C or less for 4.0 Ga, supergene jarosite would preserve original growth ages manifest as plateau ages consisting of > 95% of the gas release. Because of its susceptibility to mineralogical breakdown, 40Ar/39Ar ages on preserved Martian jarosite will reflect the time since water was present at a location that has since undergone aridification and remained hydrologically inactive and thermally quiescent.

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