The Cenomanian–Turonian boundary on the Saharan Platform (Tunisia and Algeria)

Groshény, Danièle; Ferry, Serge; Jati, Mohamed; Ouaja, Mohamed; Bensalah, Mustapha; Atrops, François; Chikhi-Aouimeur, Fettouma; Benkerouf-Kechid, Fatiha; Negra, Mohamed Hédi; Salem, Hamid Aït

doi:10.1016/j.cretres.2013.01.004

Cited by 50 publications

(19 citation statements)

References 48 publications

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“…Cenomanian sediments in this study contain abundant echinoid debris, pelagic foraminifera and oysters indicating a continued rise in relative sea‐level and open marine conditions (Grosheny et al ., ). The uppermost beds are the lateral equivalent of the upper Cenomanian to lower Turonian Bahloul Formation of Northern and Central Tunisia (Abdallah et al ., ; Grosheny et al ., ). As the rate of relative sea‐level rise slowed, large rudist build‐ups of the Gattar Member became established and prograded northwards.…”

Section: Geological Settingmentioning

confidence: 97%

Examining the interplay of climate and low amplitude sea‐level change on the distribution and volume of massive dolomitization: Zebbag Formation, Cretaceous, Southern Tunisia

Newport

Hollis

Bodin

et al. 2017

The Depositional Record

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During the Cretaceous, a humid global climate, calcitic seas, high relative sealevel and low amplitude changes in relative sea-level largely prevented largescale dolomitization in many carbonate successions. However, the well-exposed shallow-water carbonate sediments of the Upper Albian-Lower Turonian Zebbag Formation on the Jeffara Escarpment, southern Tunisia, are pervasively dolomitized. This study considers why dolomitization was so widespread in this region during a period of Earth history when platform-scale dolomitization is rare. Marine conditions were established in the Upper Albian, evidenced by stacked upward-shallowing packages of shallow subtidal to peritidal carbonate sediments in the basal Rhadouane Member. A gradual increase in the volume of subtidal sediments in the Cenomanian Kerker Member, culminated in deposition of laterally extensive marls, during maximum flooding of the platform in the Lower Turonian. The overlying Gattar Member was then deposited in shallower water as relative sea-level fell. The entire Zebbag Formation is pervasively replaced by stratabound, fabric-retentive, dolomite, except within the marl at the top of the Kerker Member, which is only partially dolomitized. Petrographic textures indicate dolomitization largely post-dated marine cementation and platform emergence but pre-dated chemical compaction. Slightly more positive oxygen isotope signatures, slightly elevated concentrations of Sr and a near-absence of evaporites are consistent with dolomitization by reflux of mesohaline sea water. An upward-decrease in major element concentrations and higher 87 Sr/ 86 Sr compared to Upper Cretaceous sea water suggest that basal, Albian siliciclastic beds acted as aquifers facilitating dolomitization by fluxing fluids offshore. Dolomitization is interpreted to have resulted from multiple fluxes of sea water over periods of 0Á5 to 2Á5 Ma. The unusually high volume of dolostone for a platform of this age most probably reflects deposition within an arid climate belt, where an efficient reflux system was facilitated by basal, permeable siliciclastic strata.

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Section: Geological Settingmentioning

confidence: 97%

Examining the interplay of climate and low amplitude sea‐level change on the distribution and volume of massive dolomitization: Zebbag Formation, Cretaceous, Southern Tunisia

Newport

Hollis

Bodin

et al. 2017

The Depositional Record

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“…greenhornensis phyletic lineage, and thus has been accommodated in the genus Thalmanninella (Gon zá lez-Donoso et al 2007, Desmares et al 2008. Ana ti cinella species have been largely documented in the WIS (Morrow 1934, Eicher and Worstell 1970, Eicher 1973, Leckie 1985, Keller and Pardo 2004, Desmares et al 2007, 2008, but their occurrence is also recorded in other low latitude localities (Eastbourne: Keller et al 2001;Tunisia: Caron et al 2006;Grosheny et al 2013;Morocco: Keller et al 2008;Tibet: Bomou et al 2013). Desmares et al (2007) identified the extinction of Th.…”

Section: Misleading Bioeventsmentioning

confidence: 99%

Age and synchronicity of planktonic foraminiferal bioevents across the Cenomanian – Turonian boundary interval (Late Cretaceous)

Falzoni¹,

Petrizzo²,

Caron³

et al. 2018

nos

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The upper Cenomanian-lower Turonian is a key-stratigraphic interval, as it encompasses the Late Cretaceous supergreenhouse and a major perturbation of the global carbon cycle (i. e., Oceanic Anoxic Event 2) as evidenced by a global positive carbon isotope excursion and by the nearly worldwide deposition of organic-rich marine facies. A turnover in planktonic foraminiferal assemblages and in other marine organisms is documented across this stratigraphic interval, but reconstruction of the timing and identification of the cause and effect relationships between environmental perturbations and organism response require a highly-resolved stratigraphic framework. The appearance and extinction levels of planktonic foraminiferal species generally allow accurate intra-and supra-basinal correlations. However, bioevents cannot be assumed to be globally synchronous, because the stratigraphic and geographic distribution of species is modulated by ecological preferences exhibited by each taxon and controlled by oceanic circulation, often resulting in earlier or delayed events in certain geographic areas (i. e., diachronous datums). The aim of this study is to test the synchronicity of the planktonic foraminiferal bioevents recognized across the C/T boundary and to provide the most reliable sequence of events for correlation of low to mid-latitude localities. For this purpose, we have compiled a highly-resolved biostratigraphic analysis of the European reference section for the C/T boundary at Eastbourne, Gun Gardens (UK), and core S57 (Tarfaya, Morocco), and correlated the sequence of bioevents identified with those recorded in other coeval sections available in the literature, including the GSSP section for the base of the Turonian Stage at Rock Canyon, Pueblo (Colorado), where we calculated reliable estimates of planktonic foraminiferal events that are well-constrained by radioisotopically and astrochronologically dated bentonite layers. Results indicate that the extinctions of Thalmanninella deeckei, Thalmanninella greenhornensis, Rotalipora cushmani and "Globigerinelloides" bentonensis in the latest Cenomanian are reliable bioevents for correlation. In addition, our analysis highlights other promising lowest occurrences (LOs) that need to be better constrained by bio-and chemostratigraphy, including the LO of Marginotruncana schneegansi falling close to the C/T boundary. By contrast, the appearance of Helvetoglobotruncana helvetica and of some Dicarinella species, the extinction of anaticinellids and the onset of the "Heterohelix" shift are likely diachronous across low to mid-latitude localities. Finally, our study suggests that different species concepts among authors, different sample size and sampling resolution, as well as species paleoecology are important factors that control the stratigraphic position at which bioevents are identified.

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“…-The Upper Cretaceous, are clays at gypsum and dolomtic benches (Cenomanian-Turonian-Senonian), they constitute the perched synclines(Fig. 2)[23,24].…”

mentioning

confidence: 99%

Effect of quaternary cementitious systems containing limestone, blast furnace slag and natural pozzolan on mechanical behavior of limestone mortars

Makhloufi

Chettih

Bédérina

et al. 2015

Construction and Building Materials

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The Cenomanian–Turonian boundary on the Saharan Platform (Tunisia and Algeria)

Cited by 50 publications

References 48 publications

Examining the interplay of climate and low amplitude sea‐level change on the distribution and volume of massive dolomitization: Zebbag Formation, Cretaceous, Southern Tunisia

Examining the interplay of climate and low amplitude sea‐level change on the distribution and volume of massive dolomitization: Zebbag Formation, Cretaceous, Southern Tunisia

Age and synchronicity of planktonic foraminiferal bioevents across the Cenomanian – Turonian boundary interval (Late Cretaceous)

Effect of quaternary cementitious systems containing limestone, blast furnace slag and natural pozzolan on mechanical behavior of limestone mortars

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