Tectonic and eustatic impact on depositional features in the upper Cretaceous Austin Chalk Group of south-central Texas, USA

Cooper, John Roberts; Godet, Alexis; Pope, Michael C.

doi:10.1016/j.sedgeo.2020.105632

Cited by 9 publications

(3 citation statements)

References 37 publications

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“…In this proximal region, the prevalence of trace fossils representing the Cruziana Ichnofacies suggests that the ACG was deposited in a well-oxygenated shelfal setting, with normal marine salinity, situated near storm-wave base (Dawson & Reaser, 1985, 1990. Cooper et al (2020) the depositional environment in the ACG fluctuated from outer ramp to inner ramp (above stormwave base) based on outcrops in Bexar County, south Texas, highlighting depositional geometries and sequence stratigraphic architectures associated with regional and local tectonics. In contrast, Loucks et al (2020bLoucks et al ( , 2021a proposed a widespread, deeper-water setting across the Late Cretaceous shelf without significant shallowing based on the dominance of coccolith elements and the paucity of benthic foraminifera throughout ACG.…”

Section: Stratigraphic Framework and Regional Depositional Setting Of...mentioning

confidence: 98%

“…Cooper et al . (2020) suggested that the depositional environment in the ACG fluctuated from outer ramp to inner ramp (above storm‐wave base) based on outcrops in Bexar County, south Texas, highlighting depositional geometries and sequence stratigraphic architectures associated with regional and local tectonics. In contrast, Loucks et al .…”

Section: Geological Backgroundmentioning

confidence: 99%

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Sedimentary environment and benthic oxygenation history of the Upper Cretaceous Austin Chalk Group, south Texas: An integrated ichnological, sedimentological and geochemical approach

Zheng,

Kerans,

Buatois

et al. 2024

Sedimentology

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Oxygen concentration in the ocean is vital for sustaining marine ecosystems. While the potential impacts of deoxygenation on modern oceans are hard to predict, lessons can be learned from better characterizing past geological intervals formed under a greenhouse climate. The greenhouse Cretaceous containing several oceanic anoxic events characterized by widespread oxygen‐deficient water is ideal in this regard. The Austin Chalk Group in south Texas (USA) shows organic‐rich intervals that can be linked to oxygen depletion in the ocean, but the exact bottom water oxygenation conditions have not been estimated. This study aims to reconstruct both sediment interstitial and bottom water oxygenation history during Austin Chalk Group deposition by integrating detailed ichnological, sedimentological and geochemical (X‐ray fluorescence and X‐ray diffraction) analyses, thereby providing a consistent model that may be applicable across a range of marine shelf settings. The 141.12 m Gise #1 core contains a continuous record of the Austin Chalk Group, providing an opportunity for unravelling oxygenation and deoxygenation events. Whereas the anaerobic–exaerobic deposits are essentially nonbioturbated, four oxygen‐related ichnocoenoses are defined, further refining the transition of aerobic to dysaerobic conditions in the sediment interstitial water. Omission surfaces and glauconitic grains, products of current‐induced scouring and condensation, suggest sporadic high‐energy events in the Austin Chalk Group ramp that drove elevated terrestrial inputs. Geochemical data further help to identify anoxic bottom water conditions within the anaerobic facies. Additionally, the lowermost part of Austin Chalk Group illustrates redox cycles, whereas dilution events characterized by elevated terrestrial input are identified throughout the rest of Austin Chalk Group. The evolution of oxygenation levels in sediment interstitial water and bottom water disputes the existence of a long‐lasting oxygen‐deficient sea in south Texas. The refined depositional model may be applicable to coeval shelfal settings. Moreover, the results provide insights into variable, evolving palaeoclimatic and palaeoceanographic conditions of the greenhouse Late Cretaceous.

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Section: Stratigraphic Framework and Regional Depositional Setting Of...mentioning

confidence: 98%

Section: Geological Backgroundmentioning

confidence: 99%

Sedimentary environment and benthic oxygenation history of the Upper Cretaceous Austin Chalk Group, south Texas: An integrated ichnological, sedimentological and geochemical approach

Zheng,

Kerans,

Buatois

et al. 2024

Sedimentology

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“…In these basins, the lateral extension of the layers are typically a few hundred meters; thus, when the distance between boreholes is greater, several characteristics of the well logs associated with the layers are not maintained laterally. These characteristics of unconsolidated detrital environments mean that borehole correlation requires strong support from geological, geochronological, and biostratigraphic information obtained from borehole cuttings [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Correlation of Boreholes through Well Logs: Application to the Western Sector of Madrid

Díaz-Curiel

Arévalo-Lomas

Biosca

et al. 2023

Sensors

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This study correlates the results obtained from the resistivity and spontaneous potential well logs in six boreholes for water extraction, located in the multilayer siliciclastic basin in the Madrid region, in the center of the Iberian Peninsula. Given the small lateral continuity that the layers considered in isolation show in this type of multilayer aquifer, geophysical stretches, with their corresponding average lithological assignments, have been established to achieve this objective from the well logs. These stretches allow for mapping the internal lithology in the studied area, obtaining a correlation of greater geological scope than that provided by the correlation between layers. Subsequently, the possible correlation of the lithological stretches selected in each of the boreholes was analyzed, verifying their lateral continuity and establishing an NNW-SSE section in the study area. In this work, the transcendence of the correlation of wells up to great distances (about 8 km in total, and average distance of 1.5 km between wells) is focused on the fact that, if there is a presence of pollutant in certain aquifer stretches in a part of the studied area, overexploitation in the Madrid basin will cause the mobilization of this pollutant to the whole basin, with a possible impact on non-polluted areas.

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The hardgrounds of the Turonian–Coniacian carbonates of the Bagh Group of central India

Ruidas¹,

Zijlstra²

2023

J Earth Syst Sci

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Tectonic and eustatic impact on depositional features in the upper Cretaceous Austin Chalk Group of south-central Texas, USA

Cited by 9 publications

References 37 publications

Sedimentary environment and benthic oxygenation history of the Upper Cretaceous Austin Chalk Group, south Texas: An integrated ichnological, sedimentological and geochemical approach

Sedimentary environment and benthic oxygenation history of the Upper Cretaceous Austin Chalk Group, south Texas: An integrated ichnological, sedimentological and geochemical approach

Correlation of Boreholes through Well Logs: Application to the Western Sector of Madrid

The hardgrounds of the Turonian–Coniacian carbonates of the Bagh Group of central India

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