Large Meteorite Impacts and Planetary Evolution
Pseudotachylites of the Beaverhead impact structure: Geochemicaly geochronological, petrographic, and field investigations
Published:January 01, 1992
P. S. Fiske, R. B. Hargraves, T. C. Onstott, C. Koeberl, S. B. Hougen, 1992. "Pseudotachylites of the Beaverhead impact structure: Geochemicaly geochronological, petrographic, and field investigations", Large Meteorite Impacts and Planetary Evolution, B. O. Dressier, R.A.F. Grieve, V. L. Sharpton
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Dikes and pods of pseudotachylite up to one meter thick have been found over an area >50 km2 in the same area as shatter cones and other possible features of shock metamorphism in the Beaverhead and Tendoy Mountains in southwestern Montana, defining the allochthonous remains of the Beaverhead impact structure (see also Hargraves et al., Chapter 19, this volume). They are not associated with any tectonic feature in the area and have several features uncommon in pseudotachylites formed by tectonic processes (large size, vesicles, pseudotachylite clasts within pseudotachylite), but which have been documented in pseudotachylites from other impact structures....