A geochemical investigation of the Valley Spring gneiss and Packsaddle schist, Llano Uplift, Texas
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Samples of the Valley Spring gneiss and Packsaddle schist were taken along two profiles in northern and south-eastern Llano County, Texas. These samples were analyzed for the major oxides, thorium, and uranium. A comparison of the Valley Spring gneiss and Packsaddle schist analyses with analyses of other rock types indicated:. 1) the parent rock of the Valley Spring gneiss could have been granitic or arkosic material: 2) banded amphibolites of the Packsaddle schist were originally mafic tuffs mixed with calcareous sediments; and 3) the parent rocks of the non-banded amphibolites of the Packsaddle schist were iron-rich basaltic material, probably tholeiitic.
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Billings, Gale K. "A geochemical investigation of the Valley Spring gneiss and Packsaddle schist, Llano Uplift, Texas." (1962) Master’s Thesis, Rice University. https://hdl.handle.net/1911/89927.