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Title:
Variability of diffusion of argon in albite, pyroxene, and olivine in shocked and unshocked samples
Authors:
Weirich, J. R.; Isachsen, C. E.; Johnson, J. R.; Swindle, T. D.
Affiliation:
AA(University of Arizona, Department of Planetary Sciences, 1629 E. University Blvd., Tucson, AZ 85721, United States; ), AB(University of Arizona, Department of Geosciences, 1040 E. 4th St., Tucson, AZ 85721, United States), AC(Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723, United States), AD(University of Arizona, Department of Planetary Sciences, 1629 E. University Blvd., Tucson, AZ 85721, United States; University of Arizona, Department of Geosciences, 1040 E. 4th St., Tucson, AZ 85721, United States)
Publication:
Geochimica et Cosmochimica Acta, Volume 77, p. 546-560. (GeCoA Homepage)
Publication Date:
01/2012
Origin:
ELSEVIER
Abstract Copyright:
Elsevier Ltd
DOI:
10.1016/j.gca.2011.10.040
Bibliographic Code:
2012GeCoA..77..546W

Abstract

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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