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- W121574125 abstract "ABSTRACT Excellent exposures of Fort Terrett Formation (Edwards Group) carbonates occur along new roadcuts of Interstate 10 in the vicinity of Junction, Texas. The Fort Terrett contains well-developed depositional cycles, most of which consist of supratidal, intertidal, and subtidal facies. The Fort Terrett also exhibits complex diagenetic cycles that include calcitization, dolomitization, sulfate emplacement and dissolution, silicification, and, in some cases, dedolomitization. Depositional and diagenetic patterns reflect superimposition of the following processes: (1) eustatic changes in sea level and associated climatic fluctuations, (2) seaward progradations of supratidal, intertidal, and subtidal facies, and (3) subsidence. Limestone intervals exhibit abundant evidence of having stabilized in fresh-water diagenetic environments. Supratidal deposits represent sabkhas and were penecomtemporaneously dolomitized according to the Persian Gulf model. In many cycles, portions of subtidal facies have also been dolomitized, possibly in zones of mixing at the bases of fresh-water lenses. Primary porosity was formed in grainstones but very little was preserved. Much secondary porosity was formed in limestone intervals through selective dissolution of crystalline aragonitic shells and ooids. Most secondary porosity in limestones has been occluded by calcite cements, but some has been selectively preserved within hollow micrite envelopes, on micritized foundations, and in large micrite-walled solution vugs. Secondary intercrystalline and moldic porosity were formed and extensively preserved in dolostone intervals. Much porosity was created within collapse breccias which were formed through dissolution of sulfates. In thin collapse breccias most porosity has been occluded by deposition of internal sediment and meteoric cements. Considerable porosity still exists in a thick collapse zone in the upper Fort Terrett. Tertiary porosity is very well developed and extensively preserved in most dolostone intervals and in many limestone units. Tertiary porosity was created through dissolution of sparry anhydrite which extensively replaced limestones and dolostones after secondary voids had been formed and filled by cements. Pulverulent limestones and dolostones represent soft, powdery materials which once contained exceedingly high concentrations of sparry replacement anhydrite. End_of_Record - Last_Page 439-------" @default.
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- W121574125 date "1977-01-01" @default.
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- W121574125 title "Abstract: Deposition and Diagenesis of the Fort Terrett Formation (Edwards Group) in the Vicinity of Junction, Texas" @default.
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