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The AAPG/Datapages Combined Publications Database
Journal of Sedimentary Research (SEPM)
Abstract
Limpid Dolomite in Permian San Andres Halite Rocks, Palo Duro Basin, Texas Panhandle: Characteristics, Possible Origin, and Implications for Brine Evolution
Guoqiu Gao (2), Susan D. Hovorka, Harry H. Posey
ABSTRACT
Minor quantities of diagenetic, ordered, and stoichiometric limpid dolomite (composition = Ca0.999 Mg0.982Fe0.009Mn0.010 [CO3]2) were found at the contacts between mudstone and halite and along the boundaries between halite crystals in San Andres halite rocks, Palo Duro Basin, Texas Panhandle. The dolomite is characterized by low Sr content (average 65 ppm), light 18O values (average 18O = -2.7, PDB), light 13C values (average 13C = -3.0, PDB), and radiogenic 87Sr/86Sr ratios (0.70723 to 0.70762) relative to bedded anhydrite (0.70714 to 0.70727). Our findings 1) document that the limpid dolomite was the latest diagenetic phase in the San Andres halite rocks; 2) confirm that meteoric water, preserved in mudstone interbeds within the halite rocks, was an important fluid source for the dolomite formation; and 3) suggest that the dolomite was precipitated, enhanced by sulfate-reduction process, during burial compaction of the mudstones from a halite-saturated brine which was derived from the mixing of mudstone-released water with evaporated brine from halite.
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