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- Title
Textural Analysis of Picuris-Pecos Fault Deformation: Dalton Canyon, New Mexico.
- Authors
CLARY, WESLEY
- Abstract
The Picuris-Pecos fault has been shown to have about 40 km of observed dextral strike slip separation due to to various contributions of Laramide, Pennsylvanian, and/or Precambrian age fault slip and reactivation (e.g. Cather et al., 2000; Erslev et al., 2004; Sanders et al., 2006). Based on the regional cooling history, deformation in the Precambrian would likely be ductile while more recent deformation would be dominated by brittle features. Original field workers interpreted the main phase of deformation along the Picuris-Pecos to be Precambrian, and interpreted the observed deflection of folded units near the fault to be ductile and relatively high temperature. Other more recent studies have shown large offsets in Pennsylvanian rocks, and have proposed the main phase of dextral separation to have occurred during the Ancestral Rocky Mountain orogeny. Petrographic and structural analysis by Luther et al., 2012 proposed that ~2.5 km of observed refolding in the Hondo syncline was likely at brittle-ductile conditions and predated, or formed during, the inception of dextral shear possibly associated with Grenville age activities. In order to evaluate hypotheses proposing brittle or ductile deformation we present a pilot textural study of the Picuris-Pecos fault at Dalton Canyon based on field measurements such as foliations, and petrographic analysis of oriented thin sections collected in the area. We approach ductile deformation using a spatial analysis of foliations in the McClure quadrangle to quantify orientation near the fault, and we quantify brittle deformation by comparing grain size distributions in cataclasite samples near the fault zone.
- Subjects
NEW Mexico; FAULT zones; DEFORMATIONS (Mechanics); PETROLOGY; SURFACE texture; SYNCLINES; PRECAMBRIAN; DUCTILITY
- Publication
New Mexico Journal of Science, 2016, Vol 50, Issue 1, p61
- ISSN
0270-3017
- Publication type
Article