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Showing 1 to 8 of 8 for “"Llano Uplift"”.
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Petrology of the Gradational Intrusive Contact Between the Packsaddle Schist and the Town Mountain Granite, Enchanted Rock State Natural Area, Llano Uplift, Central Texas
… is a gradational contact exhumed within the Llano uplift. This contact is exposed along the southeastern margin of the Enchanted Rock batholith in central Texas. Field observations, hand sample and thin section petrography, and handheld X-ray fluorescence analysis of hand samples were used to …
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Evaluating the Usefulness of Geochronometers in the Packsaddle Domain for Refining the Timing of Metamorphism Via High-Resolution Petrography, Enchanted Rock State Natural Area, Llano Uplift, Texas
<p>The Llano uplift, central Texas, exhumes Mesoproterozoic rocks with a complex history of metamorphism, deformation, and magmatism. There are three recognized metamorphic events related to the Grenville orogeny (~1.3-0.9 Ga). The timing of these metamorphic events is not well resolved due to past …
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Structural geology of carboniferous rocks near Marble Falls, Burnet County, Texas
… was being deposited and was initiated by the Llano uplift to the west. Folded and steeply-dipping sandstone beds in the Smithwick formation are located adjacent to faults, usually on the downthrown side. The folds are overturned to the east and have originated from sliding of sand and clay off …
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Mantle flow and lithosphere-asthenosphere coupling beneath the southwestern edge of the North American craton: constraints from shear-wave splitting measurements
… Except for a small area in the vicinity of the Llano Uplift in central Texas, no systematic azimuthal variations of the splitting parameters are observed, suggesting that a single layer of anisotropy with horizontal axis of symmetry can adequately explain the observations. Estimation of the …
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Reservoir Characterization and Depositional System of the Atokan Grant Sand, Fort Worth Basin, Texas
… the west by the Bend Arch, to the south by the Llano uplift, to the east by the Ouachita structural front, and to the northeast by the Muenster Arch. The Grant Sands are approximately 1,500 ft stratigraphically above their source, the Barnett Shale, and were discovered and mapped from early …
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PETROGRAPHIC AND STRATIGRAPHIC ANALYSIS ALONG THE LOWER CRETACEOUS STRATA, IN KIMBLE COUNTY TEXAS
… during the Middle Cretaceous in the south Llano Uplift region. The upper Trinity Group was deposited on a southward dipping platform in the Kimble County area. Stratigraphic units of the upper Trinity Group are the Hensel Formation, determined to be supratidal claystones, the Glen Rose …
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Evaluation of Groundwater Quality in Paleozoic Aquifers Using GIS Techniques, Central Texas
… in the Paleozoic Aquifers surrounding the Llano Uplift of Central Texas has been recorded and made available to the public through the Texas Water Development Board (TWDB). This study evaluated the results of these data dating back to the 1940s to determine changes over time, the dynamics …
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Petrography and geochemistry of Cambrian-Ordovician marine cements: Implications for Early Paleozoic cementation processes and seawater chemistry
The San Saba Member of the Wilberns Formation (Llano Uplift) and the Cow Head Group (Newfoundland) contain a variety of carbonate cements which exhibit petrographic evidence of having formed within Cambrian and Ordovician marine environments. Early marine cements which have not recrystallized …