The relationship of brine chemistry of the Pennsylvanian Paradox Evaporite Basin (southwestern USA) to secular variation in seawater chemistry

• Autorzy: Petrychenko O. Y. , Williams-Stroud S. , Peryt T. M.
• Języki publikacji: EN

Abstrakty

EN

To establish the brine chemistry associated with the evaporites in the Pennsylvanian Paradox Basin of southeastern Utah and southwestern Colorado (USA), the composition of primary fluid inclusions was determined for sedimentary halite from two drill cores, one near the central part of the basin (Shafer Dome No. 1) and one from a more marginal location of the basin (Gibson Dome No. 1). Chemical analysis of halite fluid inclusions was done on six samples from three different evaporite cycles of the Paradox Formation; cycle 10 in the Shafer Dome core and cycles 6 and 18 from the Gibson Dome core. The inclusions that range in size from 2 to 80 microns across, were analyzed using the Petrychenko method. Large inclusions (40 to 80 microns across) that were used for the chemical analyses contain one fluid phase with a carnallite or sylvite daughter crystal. Also reported in this study are fluid inclusion homogenization temperatures for sylvite or carnallite from primary halite crystals in the Gibson Dome core and in Shafer Dome. The relationship between K⁺ and Mg²⁺ in chloride rich inclusions corresponds to their proportion in MgSO₄-depleted marine waters concentrated to the stage of carnallite deposition. A correlative relationship was observed between K⁺2+4-rich to MgSO₄-poor compositions that have been proposed by other workers. A transition from MgSO₄-rich to MgSO₄-poor seawater composition may have occurred between Pennsylvanian and Permian times. This paper presents a possible alternate explanation to those already proposed in the literature, that the Paradox Formation mineralogy resulted from an intermediate seawater composition that records the global transition from MgSO₄-rich to MgSO₄-poor seawater.

Słowa kluczowe

EN

Pennsylvanian; Paradox Basin; evaporites; fluid inclusions; seawater chemistry

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2012
• Tom: Vol. 56, No 1
• Strony: 25--40
• Opis fizyczny: Bibliogr. 54 poz., rys., tab., wykr.

Twórcy

autor

Petrychenko O. Y.

autor

Williams-Stroud S.

autor

Peryt T. M.

• Institute of Geology and Geochemistry of Combus tible Minerals, National Academy of Sciences of Ukraine, Naukova 3A, 79060 Lviv, Ukraine

Bibliografia

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