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The AAPG/Datapages Combined Publications Database
West Texas Geological Society
Abstract
Abstract: Joint Analysis of Handcock Hill, Alpine Tx
Abstract
Detailed structural analysis was undertaken on mode I joints and shear fractures within the 36.6 Ma Crossen Trachyte that underlies Hancock Hill in Brewster County, Texas. Using a square meter as a repeated sample-area size at 100m to 200m- spaced outcrops on the hill, orientations and dimensions were recorded for all joints above 10 cm within the square. Compilation of orientation data in GIS allows multiple scales of analysis, because the fracture pattern at each sample site is maintained in the GIS even while the pattern over the entire 1219-meter-diameter hill is shown. Preliminary data show that joint orientations at the scale of the hill correlate with the hill’s current topography. Because structural orientations reveal paleo-stress orientations, the correlation of hill-scale joint orientations and hill slope within this flow deposit reveals an element of geomorphic history.
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