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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)...

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