Facies architecture and high-resolution sequence stratigraphy of an Upper Cretaceous platform margin succession, southern central Pyrenees, Spain

Pomar, Luis; Gili, Eulàlia; Obrador, Antonio; Ward, William C.

doi:10.1016/j.sedgeo.2004.11.009

Cited by 46 publications

(16 citation statements)

References 40 publications

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“…For interpreting heterozoan carbonate deposits, it is crucial to separate the relative influence of different parameters such as temperature, trophic conditions and ocean chemistry, etc. (e.g., Pomar et al 2005;Halfar et al 2006). In the following, examples are presented that have been interpreted as tropical carbonates in spite of their heterozoan character, and the steering mechanisms for the biotic associations are discussed.…”

Section: Ancient Heterozoan Warm-water Carbonatesmentioning

confidence: 99%

“…These changes are interpreted to imply that the sediments have formed in deeper, darker, and more eutrophic conditions as the underlying typical tropical coral-bearing carbonates. However, as Pomar et al (2005) pointed out, the Cretaceous corals flourished in deeper water than their modern equivalents, questioning the water-depth interpretation. Carannante et al (1995) demonstrate that the extensive development of foramol associations in the tropical-subtropical seas of the Upper Cretaceous point to increased trophic conditions.…”

Section: Upper Cretaceous Nw Sardinia Southern Appenines and Apuliamentioning

confidence: 99%

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Heterozoan carbonates in subtropical to tropical settings in the present and past

Westphal

Halfar

Freiwald

2010

Int J Earth Sci (Geol Rundsch)

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Water temperature has received considerable attention as steering factor for the genesis of different types of marine carbonate sediments. However, parameters other than temperature also strongly influence ecosystems and, consequently, the carbonate grain associations in the resulting carbonate rock. Among those factors are biological evolution, water energy, substrate, water chemistry, light penetration, trophic conditions, CO 2 concentrations, and Mg/Ca ratios in the seawater. Increased nutrient levels in warm-water settings, for example, lead to heterotrophicdominated associations that are characteristic of temperate to cool-water carbonates. Failure to recognize the influence of such environmental factors that shift the grain associations towards heterotrophic communities in low latitudes can lead to misinterpretation of climatic conditions in the past. Modern analogues of low-latitude heterozoan carbonates help to recognize and understand past occurrences of heterozoan warm-water carbonates. Careful analysis of such sediments therefore is required in order to achieve robust reconstructions of past climate.

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Section: Ancient Heterozoan Warm-water Carbonatesmentioning

confidence: 99%

Section: Upper Cretaceous Nw Sardinia Southern Appenines and Apuliamentioning

confidence: 99%

Heterozoan carbonates in subtropical to tropical settings in the present and past

Westphal

Halfar

Freiwald

2010

Int J Earth Sci (Geol Rundsch)

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“…These high sea levels combined with high temperatures (Huber et al, 2002;Gustafsson et al, 2003;Forster et al, 2007) were very favorable to the development of carbonate platforms in Cenomanian intracratonic basins (Floquet, 1998;Pomar et al, 2005;Smith et al, 2006;Gertsch et al, 2008;El-Sabbagh et al, 2011). There are still uncertainties about the factors controlling the formation and evolution of carbonate ramps and platforms, especially in stable areas.…”

Section: Introductionmentioning

confidence: 99%

The Mid-Cenomanian Event in shallow marine environments: Influence on carbonate producers and depositional sequences (northern Aquitaine Basin, France)

Andrieu

Brigaud

Rabourg

et al. 2015

Cretaceous Research

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a b s t r a c tThe Mid-Cenomanian Event was a positive carbon-isotope (d 13 C) excursion recorded in hemipelagic basins of the western Tethyan Sea, North to Tropical Atlantic Ocean, and Japan. It is thought of as a prelude to the Oceanic Anoxic Event 2. However, the Mid-Cenomanian Event has never been studied in detail in shallow marine platform deposits and it is not known how it relates to carbonate production and stratigraphic geometry. To better understand how this carbon cycle disruption influenced the neritic biological communities in shallow carbonates during the Cenomanian, a facies, geochemical, diagenetic, and sequence stratigraphic study of the northern Aquitaine platform has been conducted. Seventy-six d 13 C and d 18 O measurements have been made on micrite, rudists, and diagenetic cements. Fifteen sedimentary facies have been arranged into four depositional environments. Three third-order sequences (C B , C C , C D ) are defined from late early Cenomanian to early late Cenomanian and are well correlated with eustatic cycles in European basins. Two peaks of the Mid-Cenomanian Event (MCE1a, þ1.2‰, and MCE1b, þ1.7‰) have been identified for the first time in shallow marine carbonates.Analysis of diagenetic blocky calcite cements suggests that diagenesis did not affect the d 13 C of micrite, which can be discussed in terms of the initial signal. The Mid-Cenomanian Event was synchronous with a turnover in neritic carbonate producers marking a transition from photozoan to heterozoan facies. This facies change resulted from the establishment of mesotrophic to eutrophic conditions at the early/midCenomanian transition, reflecting a clear connection between the Mid-Cenomanian Event and neritic biological communities. Depositional geometry and carbonate production varied with d 13 C during the Mid-Cenomanian Event on the Aquitaine platform. When d 13 C values were between 2.5‰ and 3‰, the geometry was a flat platform with a high carbonate sedimentation rate leading to the formation of sandbars and rudist bioherms (Accommodation/Sedimentation ratio less than 1, A/S < 1). When the d 13 C value exceeded 3‰, a carbonate demise occurred and clays and marls were deposited in the lower offshore environment (A/S >> 1). The general carbonate demise affecting the northern Aquitaine platform during the mid-Cenomanian can be explained by both a eustatic sea-level rise and the establishment of eutrophic conditions. The coincidence of the Mid-Cenomanian Event with both (1) the occurrence of mesotrophic to eutrophic conditions marked by carbonate producer turnover from photozoan to heterozoan facies and (2) the transgressive cycles, suggests that eustatic sea-level rise leading to high trophic conditions could explain this positive d 13 C excursion in the Atlantic and western Tethyan domain. During the mid-Cenomanian, carbon cycle perturbations largely controlled the neritic biological communities on shallow carbonate platforms in a part of the western Tethyan domain.

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“…The sediment influx is controlled by drainage area, climatology and tectonics, while accomodation is re− lated to eustatic changes and subsidence of the sea−bottom (Swift and Thorne 1991;Pomar 2001). The situation is more complex in carbonate shelfs, being the sediment produced in− side the shelf, and directly related to accomodation, an inter− dependent factor (Pomar 2001;Pomar et al 2005). Accomo− dation also controls the primary production through shallow euphotic zone depth.…”

Section: Review Of Foraminiferal Palaeoecologymentioning

confidence: 99%

Evaluation of methods for retrieving foraminifera from indurated carbonates: application to the Jurassic spongiolithic limestone lithofacies of the Prebetic Zone (South Spain)

Reolid

Herrero

2004

Micropaleontology

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Facies architecture and high-resolution sequence stratigraphy of an Upper Cretaceous platform margin succession, southern central Pyrenees, Spain

Cited by 46 publications

References 40 publications

Heterozoan carbonates in subtropical to tropical settings in the present and past

Heterozoan carbonates in subtropical to tropical settings in the present and past

The Mid-Cenomanian Event in shallow marine environments: Influence on carbonate producers and depositional sequences (northern Aquitaine Basin, France)

Evaluation of methods for retrieving foraminifera from indurated carbonates: application to the Jurassic spongiolithic limestone lithofacies of the Prebetic Zone (South Spain)

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