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• W2055133611 abstract "Rock samples from a total of 50 drillholes in the Cerro Prieto geothermal area have been analysed by stable isotopic techniques. In particular, calcite in cuttings and core samples from these wells has been analysed to observe systematic variations in carbon (δ 13C) and oxygen (δ 18O) isotopic compositions. Consistent behaviours of these isotopic systems are observed and provide a large amount of information on the processes of calcite-water isotopic equilibration, dissolution-precipitation and decarbonation occurring within and around the reservoir. Oxygen isotopic profiles of intergranular calcites in sandstones appear to be a reliable measure of the equilibrium temperature distribution in the field before production began. From these data, a detailed three-dimensional map has been developed, showing the equilibrium temperatures in the geothermal field. Of particular importance are many examples of temperature reversals at depth beneath the hot geothermal reservoir. Reversals of this sort provide strong constraints on the directions of fluid flow and the overall dynamics of the circulation system. Long-term natural flow directions within the geothermal system can often be inferred directly from the three-dimensional distribution of temperatures within the field. In addition, localized areas of inferred natural cold water inflow (recharge) or hot water outflow (discharge) can be observed by their effects on the calcite content of the rock and on the behaviour of carbon isotopic compositions of the calcite. Within the geothermal reservoir, a gradual disappearance of calcite, with increasing temperature, correlates generally with a slight decrease in δ13C of the calcite. Although this pattern is nearly identical to the isotopic changes occurring during decarbonation of calcite in skarn areas, it is probable that other processes involving dissolution by the brines or isotopic exchange with an external carbon reservoir are also locally important. A mass balance calculation has been performed using measured 18O depletion in subsurface whole-rock samples from Cerro Prieto wells and the inferred 18O enrichment of the geothermal brine. This calculation implies an overall water-rock volume ratio of approximately 3:1 during the history of the Cerro Prieto system." @default.
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• W2055133611 date "1984-01-01" @default.
• W2055133611 modified "2023-09-24" @default.
• W2055133611 title "Stable isotope systematics of oxygen and carbon in rocks and minerals from the Cerro Prieto geothermal anomaly, Baja California, Mexico" @default.
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• W2055133611 doi "https://doi.org/10.1016/0375-6505(84)90006-3" @default.
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