Relationship Between Radar Lineaments, Geologic Structure and in Situ Stress in East Texas




Baumgardner, Jr., Robert W.

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Radar-based lineaments in East Texas and northwest Louisiana were studied to determine their relationship to surficial and subsurface geologic structure and to in situ stress. For all lineament data, two significant azimuths of vector sums were defined: 325° and 37°. The northwest trend has the same orientation as the mean direction of wellbore elongations in the Schuler Formation throughout the East Texas Basin. However, this trend is significantly different from the 344° orientation of wellbore elongation in the overlying Travis Peak Formation. These results suggest a complex relationship between subsurface stress and the northwest lineament trend. The northeast lineament trend does not coincide with the orientation of any known stress or regional structure and may be an artifact of radar illumination direction. Unlike a previous regional study based on smaller-scale Landsat data, no consistent correlation between surficial or subsurface structure and lineament density was discovered. However, high values of lineament density occur preferentially on outcrops of the Sparta and Leeches Formations. These results suggest that either most radar lineaments smaller than Landsat lineaments are manifestations of unmapped subregional or local structures or most radar lineaments are surficial phenomena, unrelated either to subsurface geologic structure or to stress.


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