Conditions of Deposition of Palliser (Devonian) Limestone of Southwestern Alberta

Beales, F. W.

doi:10.1306/5ceae45d-16bb-11d7-8645000102c1865d

Cited by 13 publications

(1 citation statement)

References 9 publications

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“…The wider consensus has been established that microspar occurs from recrystallization of previously lithified micrite. However, there are examples [73,74] that chalks, although made of micrite, do not recrystallize to microspar even if subjected to fresh water meteoric diagenetic conditions. Many ancient carbonate systems do not experience meteoric conditions [75], which also raises the question about the origin of the microspar in them.…”

Section: Early Calcite Cementationmentioning

confidence: 99%

Diagenetic Evolution of Upper Cretaceous Kawagarh Carbonates from Attock Hazara Fold and Thrust Belt, Pakistan

Rehman,

Munawar,

Shah

et al. 2023

Minerals

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A recent hydrocarbons discovery in 2021 in the Kawagarh Formation has brought attention to the significance of sedimentology and specifically diagenesis for understanding and characterizing the reservoir properties. The diagenetic history and multiscale processes that contributed to diagenesis were vaguely known. This study aimed to reconstruct various diagenetic phases, paragenetic sequences, and the interrelationship of these phases in the Kawagarh Formation. The diagenetic processes were identified and characterized through an integrated methodology utilizing the outcrop, petrographic, and geochemical analyses. Early calcite cementation was found to occur in the early stages of marine burial diagenesis involving pore fluid originating from the dissolution of aragonite in interlayer marl/mudstone beds and reprecipitating as microspar in adjacent limestone beds. The absence of mechanical compaction in wackstone and mudstone facies and the presence of late compaction in lithified packstones clearly imply that early calcite cementation occurred prior to compaction. Dolomitization with stylolites coupled with significant negative oxygen (δ18O) isotope values implies a fault-related hydrothermal dolomitization model. Uplift introduced the fractures and low Mg fresh fluids to the system which caused calcitisation in shallow burial settings. The depleted δ13C and negative δ18O values indicate the mixing of surface-derived waters with hot burial fluids during the calcitization. This study offers valuable insights into several aspects related to the formation and the basin itself, including burial depths, fluid influx, and geochemical gradients. It also sheds light on the evolution of reservoir properties such as porosity and permeability in dolomitization fronts. Such insights can be used to gain a deeper understanding about the burial history, basin evaluation, and reservoir characterization for hydrocarbon exploration.

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Section: Early Calcite Cementationmentioning

confidence: 99%