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Integration of Fracture Patterns and Lineaments for Fault Mapping in Southwestern Chenango County, New York

Kelly M. McGuire, Robert D. Jacobi, Nicholas Terech, and Paul Agle, Geology, Rock Fracture Group, University at Buffalo, 876 Natural Science Complex, Buffalo, NY 14260, [email protected]

This study integrates surface structure data with lineaments to map possible fault patterns in southwestern Chenango County, New York. Bedrock in the region is the Middle to Upper Devonian Catskill Delta Complex. Previous work in the region was by Pyron et al. (2003) who correlated lineaments from an aerial photo mosaics with soil gas and paleomorphic data to determine possible structure trends in fractured shale wells in the Genegentslet field.

Characteristics of approximately 2500 surface bedrock fractures were collected within the study area, following standard UB Rock Fracture Group protocols. Fracture characteristics are displayed using modified rose diagrams which show fracture orientation, frequency, and fracture abutting relationships. Three fracture sets are common to this region: NNE-, E- and a N60° E-striking set. Fracture intensification domains (FIDs), which are characterized by closely spaced fractures, are also common in the region. In other study areas FIDs have been found to indicate faulting.

Bedrock fracture data are combined with EarthSat (1997) lineaments, DEM lineaments and aeromagnetic gradients. A N-trending zone of widely-spaced EarthSat (1997) lineaments is coincident with an aeromagnetic anomaly and sites that display N-striking fracture cleavage. Lineament zones that trend NNE, NNW, ENE and WNW are coincident with sites where we observed FIDs that parallel the lineament trends. Based on a proprietary seismic reflection profile, an ENE structure can be found on the seismic line which coincides with surface fractures, FIDs, and Landsat lineaments (EarthSat, 1997).

AAPG Search and Discovery Article #90059©2006 AAPG Eastern Section Meeting, Buffalo, New York