Altered Tectonic and Hydrothermal Breccias in Corehole VC-1, Valles Caldera, New Mexico
Report: Altered Tectonic and Hydrothermal Breccias in Corehole VC-1, Valles Caldera, New Mexico
AbstractInvestigation of breccia genesis and related hydrothermal alteration in VC-1, the first Continental Scientific Drilling Program corehole in the Valles caldera (Fig. 1) was prompted by discovery, deep in the hole, of strongly altered and sulfide-bearing breccias of both tectonic and hydrothermal origin. Hydrothermal breccias and associated crackle zones or stockworks created by hydraulic fracturing can provide significant secondary permeability, as demonstrated by their frequent occurrence as ore hosts (Sillitoe, 1985). Therefore, detailed study of the deep VC-1 breccias was undertaken not only to characterize rock disruption and hydrothermal alteration in the immediate vicinity, but also to understand more thoroughly the structural setting of active geothermal systems in the nearby Valles caldera. In this report, we will briefly discuss each of the major deep breccias in VC-l, examine the style, intensity and paragenesis of their hydrothermal alteration, and speculate on their relationship to the complex Cenozoic volcanic history of the Jemez Mountains.
- Jeffrey B. Hulen and Dennis L. Nielson
- Los Alamos National Laboratory, NM, 1985
- Report Number
- Not Provided
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Jeffrey B. Hulen,Dennis L. Nielson. 1985. Altered Tectonic and Hydrothermal Breccias in Corehole VC-1, Valles Caldera, New Mexico. Los Alamos, NM: Los Alamos National Laboratory, NM. Report No.: GL04523.