Origin of late dolomite cement by CO2-saturated deep basin brines: Evidence from the Ozark region, central United States

Leach, D. L.; Plumlee, G. S.; Hofstra, Albert H.; Landis, Gary P.; Rowan, Elisabeth L.; Viets, J.G.

doi:10.1130/0091-7613(1991)019<0348:ooldcb>2.3.co;2

Cited by 49 publications

(20 citation statements)

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“…12). Calcites and dolomites formed (Leach et al, 1991). This is evidenced by that the core portion of the saddle dolomite crystals is associated with scattered calcite inclusions.…”

Section: Implications For Fault-related Fluid Flowmentioning

confidence: 91%

Formation of saddle dolomites in Upper Cambrian carbonates, western Tarim Basin (northwest China): Implications for fault-related fluid flow

Zhang

Qian

et al. 2009

Marine and Petroleum Geology

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“…12). Calcites and dolomites formed (Leach et al, 1991). This is evidenced by that the core portion of the saddle dolomite crystals is associated with scattered calcite inclusions.…”

Section: Implications For Fault-related Fluid Flowmentioning

confidence: 91%

Formation of saddle dolomites in Upper Cambrian carbonates, western Tarim Basin (northwest China): Implications for fault-related fluid flow

Zhang

Qian

et al. 2009

Marine and Petroleum Geology

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“…Sulfide minerals in southeast Missouri MVT deposits typically are not coprecipitated, but are deposited sequentially (Hagni, 1986), so sulfur isotope thermometry is not feasible. Mineral assemblages in these deposits indicate that sulfide-depositing fluids are relatively reducing and acidic, so changing fluid redox conditions (e.g., those due to CO 2 effervescence accompanying sulfide deposition, Leach et al, 1991) cannot alone account for the documented large (>50‰) variations seen in δ 34 S values McKibben and Eldridge, 1995).…”

Section: Sulfur Isotope Compositionsmentioning

confidence: 97%

Replacement Dolomites and Ore Sulfides as Recorders of Multiple Fluids and Fluid Sources in the Southeast Missouri Mississippi Valley-Type District: Halogen-87Sr/86Sr- 18O- 34S Systematics in the Bonneterre Dolomite

2009

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Replacement dolomites may continue to recrystallize in the presence of subsequent diagenetic and hydrothermal fluids. During recrystallization, they can change both their solid geochemistry and that of their included fluids (by releasing older fluids and entrapping younger fluids). Thus it may be possible to decipher a complex fluid history by analyzing both the composition of the dolomite (δ 18 O, 87 Sr/ 86 Sr) and its contained fluids (Cl/Br), as the former reflects temperature and/or fluid-rock interactions, whereas the latter reflects salinity source regions of the last fluid to affect the dolomite. Applying this approach to the Bonneterre Dolomite of southeast Missouri, which hosts the world-class Viburnum Trend Mississippi Valley-type (MVT) Pb-Zn district, reveals the presence of two geochemically distinct types of brines whose influence varied temporally during the Bonneterre's history of dolomitization and ore deposition. A plot of Cl/Br molar ratios of included fluids versus 87 Sr/ 86 Sr ratios of the enclosing dolomite indicates distinct salinity sources for early (halite dissolution) and later (extreme evaporation of seawater) dolomitizing brines.Comparison with fluids in ore sulfides may permit us to relate replacement dolomites to ore-forming events. Early-stage copper-and zinc-bearing sulfides (δ 34 S ~0‰) have fluids with Cl/Br molar ratios (150-1,050) reflecting a similar importance of halite-dissolving brine during ore deposition. Main-stage cuboctahedral galena (δ 34 S ~15‰) has fluids with Cl/Br molar ratios (<100-400) similar to extremely evaporated seawater brines responsible for late replacement dolomites. We suggest that resident brines, which gained salinity (in part through halite dissolution), sulfur, and metals from local sedimentary and igneous rocks, were important for early replacement dolomitization and Early-stage ore deposition. This fluid type was supplanted by later, Main-stage brines that acquired salinity (through seawater evaporation) and metals in a more distal, basinal setting. Late-stage, vug-filling cubic galena records a renewed importance of the halite-dissolving brine as the influence of the more distal basinal brine waned. Halogen-sulfur isotope systematics of sulfides indicate that fluid mixing likely was a dominant ore-depositing mechanism during all stages of ore mineralization in the Viburnum Trend.

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“…The equivalent-NaCl solution is a classical approach used in many solubility calculations aiming to simulate the salting out effect (Drummond, 1981). The simulation conditions were 200 bar and 60°C and the 35 brine compositions considered were selected among data from Hitchon et al (1971), Langmuir and Melchior (1985), Kelly et al (1986), Leach et al (1991), Land (1995), Stueber et al (1998), Demir and Seyler (1999), and Martel et al (2001). The results presented on Figure 9a globally show relatively small gaps between the two calculation methods even though a significant gap can be observed for the highest salinity.…”

Section: Relative Weight Of the Various Correctionsmentioning

confidence: 89%

Improvement of the Calculation Accuracy of Acid Gas Solubility in Deep Reservoir Brines: Application to the Geological Storage of CO₂

Kervévan

Azaroual

Durst

2005

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Amélioration de la précision du calcul de la solubilité des gaz acides dans les saumures des réservoirs profonds : application au stockage géologique du CO 2 -L'évaluation des conséquences à court et long terme de l'injection de CO 2 dans les aquifères nécessite à la fois des expérimentations en laboratoire et l'utilisation de modèles afin de mieux comprendre les différents processus physicochimiques induits. La modélisation de l'injection dans un réservoir où les conditions in situ sont souvent relativement élevées en termes de température (au-delà de 50°C), pression (plusieurs centaines de bars) et salinité (supérieure à celle de l'eau de mer), implique donc d'avoir à notre disposition des outils numériques capables de prendre en compte à la fois les effets spécifiques de chaque électrolyte et la non-idéalité de la phase CO 2 gaz. Cet article propose une évaluation de la cohérence des différentes corrections (activité, fugacité, influence de la pression sur les constantes thermodynamiques) à considérer dans les modèles géochimiques afin de répondre aux besoins en termes de précision de calcul. Ces corrections ont été introduites dans le logiciel de modélisation thermo-cinétique SCALE2000 (Azaroual et al., 2004a), utilisé pour tester leur validité en comparant les résultats de calcul à des données expérimentales ou à des résultats d'autres modèles concernant la solubilité du CO 2 . Une estimation du poids relatif de chacune des corrections, dans le cas d'une saumure de salinité égale à 237 g·l -1 (60°C, pCO 2 = 200 bar), montre une surestimation systématique de la solubilité du CO 2 (supérieure à 100 %) lorsque la salinité (NaCl équivalente) est négligée ou que le gaz est considéré comme idéal ; en comparaison, l'erreur induite en considérant l'équivalent NaCl au lieu de la salinité réelle de la saumure est faible (moins de 5 %).La deuxième partie de cette étude présente un exemple d'application à un scénario hypothétique d'injection massive de CO 2 dans un réservoir carbonaté ; les données utilisées pour la composition de la saumure correspondent à des données réelles (Moldovanyi et Walters, 1992) provenant de la formation de Smackover (Arkansas, États-Unis). Les simulations réalisées en considérant un volume élémentaire représentatif de roche saturée (assemblage minéral poreux saturé avec la saumure de Smackover), soumis à une pression de CO 2 constante de 150 bar, montrent deux comportements distincts selon que le système est supposé fermé (réacteur batch) ou ouvert et alimenté par un flux constant de saumure. Dans le premier cas, les calculs réalisés avec SCALE2000 aboutissent à une modification négligeable de la composition minéralogique. Dans le second cas, plus représentatif du caractère dynamique d'un système d'injection, les résultats montrent des modifications majeures de la minéralogie aboutissant finalement à une forte augmentation de la porosité (passant de 20 % initialement à 85 % après 50 ans simulés).Une nouvelle série de calculs a ensuite été réalisée avec SCALE2000, en considérant cett...

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Origin of late dolomite cement by CO2-saturated deep basin brines: Evidence from the Ozark region, central United States

Cited by 49 publications

References 0 publications

Formation of saddle dolomites in Upper Cambrian carbonates, western Tarim Basin (northwest China): Implications for fault-related fluid flow

Formation of saddle dolomites in Upper Cambrian carbonates, western Tarim Basin (northwest China): Implications for fault-related fluid flow

Replacement Dolomites and Ore Sulfides as Recorders of Multiple Fluids and Fluid Sources in the Southeast Missouri Mississippi Valley-Type District: Halogen-87Sr/86Sr- 18O- 34S Systematics in the Bonneterre Dolomite

Improvement of the Calculation Accuracy of Acid Gas Solubility in Deep Reservoir Brines: Application to the Geological Storage of CO₂

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Origin of late dolomite cement by CO2-saturated deep basin brines: Evidence from the Ozark region, central United States

Cited by 49 publications

References 0 publications

Formation of saddle dolomites in Upper Cambrian carbonates, western Tarim Basin (northwest China): Implications for fault-related fluid flow

Formation of saddle dolomites in Upper Cambrian carbonates, western Tarim Basin (northwest China): Implications for fault-related fluid flow

Replacement Dolomites and Ore Sulfides as Recorders of Multiple Fluids and Fluid Sources in the Southeast Missouri Mississippi Valley-Type District: Halogen-87Sr/86Sr- 18O- 34S Systematics in the Bonneterre Dolomite

Improvement of the Calculation Accuracy of Acid Gas Solubility in Deep Reservoir Brines: Application to the Geological Storage of CO2

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Improvement of the Calculation Accuracy of Acid Gas Solubility in Deep Reservoir Brines: Application to the Geological Storage of CO₂