Variability of diffusion of argon in albite, pyroxene, and olivine in shocked and unshocked samples

Details Variability of diffusion of argon in albite, pyroxene, and olivine in shocked and unshocked samples Variability of diffusion of argon in albite, pyroxene, and olivine in shocked and unshocked samples

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012gecoa..77..546w&link_type=abstract

Geochimica et Cosmochimica Acta, Volume 77, p. 546-560.

Computer Science

Scientific paper

We analyzed the argon diffusion parameters of albite and pyroxene as a function of shock, as well as an olivine of unknown shock pressure. In albite, shock pressures of ˜30-60 GPa all have an equal effect on the diffusion parameters, lowering the activation energy (E) from ˜45 to ˜25 kcal/mol, and the log D0/a2 from ˜4 to ˜1 s-1. In a mixture of low-Ca and high-Ca pyroxene, similar shock pressures also have an equal effect, lowering the E from ˜130 to ˜80 kcal/mol, and the log D0/a2 from ˜14 to ˜7 s-1. However, given that some shocked and unshocked pyroxene splits have similar release patterns, making a clear distinction between the two is difficult. Additionally, splits of pure unshocked high-Ca pyroxene have an E of ˜100 kcal/mol and a log D0/a2 of ˜10 s-1, intermediate to the values of mixed pyroxene when shocked and unshocked. The olivine (Fa18) has an E of ˜45 kcal/mol and a log D0/a2 of ˜1 s-1, somewhat similar to that of feldspar. These results will be useful in interpreting complex argon release patterns from shocked multi-mineral samples too fine-grained for easy mineral separation (such as chondrites).

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