Petrographical and geochemical constraints on carbonate diagenesis in an epeiric platform deposit: Late Cretaceous Bagh Group in central India

Ruidas, Dhiren Kumar; Pomoni-Papaioannou, Fotini; Banerjee, Santanu; Gangopadhyay, Tapas Kumar

doi:10.1007/s13146-020-00624-2

Cited by 10 publications

(1 citation statement)

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“…The microfacies' definition and textural characters analysis of the carbonate rocks were defined according to Dunham [41] classification scheme, which were later modified by Embry and Klovan [42] and Flügel [43], based on the Standard Microfacies Types (SMF) in the Facies Zone (FZ) of the rimmed carbonate platform model. Depositional paleoenvironments were reconstructed based on the observed sedimentological characteristics during fieldwork and interpreted sedimentary facies analysis, and through comparison with additional outcropped data known from the existing literature on time equivalent deposits of the Ionian basin [18][19][20]44,45], as well as other environmental studies [46][47][48][49][50][51][52][53][54]. The study part of Gardiki section consists of Late Cretaceous-Early Paleocene pelagic deposits, such as pelagic limestones and radiolarian chert horizons.…”

Section: Methodsmentioning

confidence: 99%

Sedimentary and Diagenetic Controls across the Cretaceous—Paleogene Transition: New Paleoenvironmental Insights of the External Ionian Zone from the Pelagic Carbonates of the Gardiki Section (Epirus, Western Greece)

Moforis

Kontakiotis

Janjuhah

et al. 2022

JMSE

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Field investigation, biostratigraphic, paleoecological, and sedimentary microfacies analyses, as well as diagenetic processes characterization, were carried out in the Epirus region (Western Ionian Basin) to define the depositional environments and further decipher the diagenetic history of the Late Cretaceous–Early Paleocene carbonate succession in western continental Greece. Planktonic foraminiferal biostratigraphy of the studied carbonates revealed that the investigated part of the Gardiki section covers the Cretaceous–Paleogene (K-Pg) transition, partly reflecting the Senonian limestone and calciturbidites formations of the Ionian zone stratigraphy. Litho-and bio-facies analyses allowed for the recognition of three distinct depositional facies: (a) the latest Maastrichtian pelagic biomicrite mudstone with in situ planktonic foraminifera, radiolarians, and filaments, (b) a pelagic biomicrite packstone with abundant planktonic foraminifera at the K-Pg boundary, and (c) an early Paleocene pelagic biomicrite wackestone with veins, micritized radiolarians, and mixed planktonic fauna in terms of in situ and reworked (aberrant or broken) planktonic foraminifera. The documented sedimentary facies characterize a relatively low to medium energy deep environment, representing the transition from the deep basin to the deep shelf and the toe of the slope crossing the K-Pg boundary. Micropaleontological and paleoecological analyses of the samples demonstrate that primary productivity collapse is a key proximate cause of this extinction event. Additional petrographic analyses showed that the petrophysical behavior and reservoir characteristics of the study deposits are controlled by the depositional environment (marine, meteoric, and burial diagenetic) and further influenced by diagenetic processes such as micritization, compaction, cementation, dissolution, and fracturing.

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