LINEAMENTS OF SOUTHERN HIGH PLAINS: POSSIBLE INDICATORS OF RECENT FAULTING
This abstract will focus on a portion of two lineaments in Northern Hockley County, Texas that are about 2.5 km apart. These two lineaments appear to have created an almost perpendicular bend in a small ephemeral stream. A gravity profile shows approximately a half a mGal gravity anomaly across each of these lineaments. The short wavelength of these anomalies indicates a gravity contribution from a shallow source; however, the small density contrasts common for the shallow sediments in the area cannot account for the entire 0.5 mGal difference in gravity. The linearity to the features, extending for tens to over a hundred kilometers, suggests regional faulting in the subsurface to a significant depth. The best fit gravity model indicates the possibility of listric growth faulting. An electromagnetic survey found shallow, high conductivity anomalies associated with the lineaments. We believe this indicates that these lineaments may result in the erosion of the caliche layer which could become a conduit for infiltration. Continuing work in this area will include mapping in the small canyon caused by the intersection of these lineaments with the small creek intersecting the Yellow House Playa drainage.