Science at the Highest Level
These six field guides were prepared for the 2002 GSA Annual Meeting, held in Denver, Colorado.
Structural geometry and thermal history of pseudotachylyte from the Homestake shear zone, Sawatch Range, Colorado
Published:January 01, 2002
Joseph L. Allen, Kieran D. O’Hara, David P. Moecher, 2002. "Structural geometry and thermal history of pseudotachylyte from the Homestake shear zone, Sawatch Range, Colorado", Science at the Highest Level, D. Lageson
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Pseudotachylytes are frictional melts that can be formed either during meteorite impact (Grieve, 1975; Bischoff, 1982; Reimold and Colliston, 1994; Spray and Thompson, 1995), or during coseismic faulting (Sibson, 1975; Cardwell et al., 1978; Spray, 1992; Swanson, 1992). Pseudotachylyte in the Homestake shear zone (HSZ) crops out as dark, aphanitic veins that have a distinct linear map- and outcrop-scale geometry that suggests they are a product of coseismic faulting. Pseudotachylyte was first recognized in Colorado during early geologic mapping that defined the HSZ (Tweto and Sims, 1963; Tweto, 1974)...