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The AAPG/Datapages Combined Publications Database
West Texas Geological Society
Abstract
Metamorphic Petrology of the Ouachita Interior Zone: Findings from a Deep Drill Hole in West Texas
Abstract
The Exxon #1 Gatlin well in Terrell County, Texas, was drilled through a 23,000 ft section of low-grade metamorphic rocks belonging to the Ouachita Interior Metamorphic Belt (IMB). Samples from this well elucidate the nature of this metamorphic sequence. Cuttings were examined using stereo- and petrographic microscopes, and analyzed using X-ray diffraction. Rock types include phyllite, fine-grained schist, metaquartzite and impure marble, representing a sequence of metamorphosed marls and mudstones of probable early Paleozoic age. Four out of five whole rock-muscovite Rb-Sr isochrons from cuttings provide sharply concordant ages of 234±2 Ma. Subdivisions suggested by the relative proportions of various components likely correspond to stratigraphic and/or tectonic boundaries within the section.
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