Integrated depositional model for the Cenomanian–Turonian organic-rich strata in North Africa

Lüning, Sebastian; Kolonic, Sadat; Belhadj, E.M.; Belhadj, Z.; Cota, Lilit; Baric, G.; Wagner, Thomas

doi:10.1016/s0012-8252(03)00039-4

Cited by 161 publications

(97 citation statements)

References 98 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This upward movement was coeval with increased subsidence in the western parts of the section, and it is during this time frame that syn-sedimentary contractional structures developed, which have been described in chapter 4. Coeval subsidence in the W and exhumation in the E ended probably toward the end of the Early Cretaceous, beginning of the Late Cretaceous when the entire region, as well as North Africa, was covered by Cenomanian marine sediments (e.g., Luning et al 2004) and followed by generalized subsidence.…”

Section: Kinematic Evolutionmentioning

confidence: 99%

Post-rift vertical movements and horizontal deformations in the eastern margin of the Central Atlantic: Middle Jurassic to Early Cretaceous evolution of Morocco

Bertotti

Gouiza

2012

Int J Earth Sci (Geol Rundsch)

View full text Add to dashboard Cite

Wide regions of Morocco, from the Meseta to the High Atlas, have experienced km-scale upward vertical movements during Middle Jurassic to Early Cretaceous times following the appearance of oceanic crust in the Central Atlantic. The area experiencing exhumation was flanked to the W by a domain of continuous subsidence, part of which is named the Essaouira-Agadir basin. Comparison with vertical movement curves predicted by lithospheric thinning models shows that only 50-60 % of the subsidence documented in the Essaouira basin can be explained by postrift thermal relaxation and that \30-40 % of the observed exhumation can be explained by processes (in)directly related to the evolution of the Central Atlantic rifted margin. Syn-sedimentary structures in Middle Jurassic to Lower Cretaceous formations of the Eassouira-Agadir basin are common and range from m-scale folds and thrusts to km-scale sedimentary wedges. These structures systematically document coeval shortening generally oriented at high angle to the present margin. As a working hypothesis, it is suggested that regional shortening can explain the structural observations and the enigmatic vertical movements.

show abstract

Section: Kinematic Evolutionmentioning

confidence: 99%

Post-rift vertical movements and horizontal deformations in the eastern margin of the Central Atlantic: Middle Jurassic to Early Cretaceous evolution of Morocco

Bertotti

Gouiza

2012

Int J Earth Sci (Geol Rundsch)

View full text Add to dashboard Cite

show abstract

“…1a) with open marine circulation to the Indo-Pacific in the east and the AtlanticCaribbean-Pacific to the west. Shallow seas covered continental regions in North Africa, Europe, the Middle East and the Ural region, and a warm climate, high marine productivity and rapid burial of organic matter resulted in dark organic-rich sediment deposition in basins and/or upwelling areas during OAE2 (Luning et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Cenomanian–Turonian transition in a shallow water sequence of the Sinai, Egypt

Gertsch

Keller

Adatte

et al. 2008

Int J Earth Sci (Geol Rundsch)

View full text Add to dashboard Cite

Environmental and depositional changes across the Late Cenomanian oceanic anoxic event (OAE2) in the Sinai, Egypt, are examined based on biostratigraphy, mineralogy, d13 C values and phosphorus analyses. Comparison with the Pueblo, Colorado, stratotype section reveals the Whadi El Ghaib section as stratigraphically complete across the late Cenomanian-early Turonian. Foraminifera are dominated by high-stress planktic and benthic assemblages characterized by low diversity, lowoxygen and low-salinity tolerant species, which mark shallow-water oceanic dysoxic conditions during OAE2. Oyster biostromes suggest deposition occurred in less than 50 m depths in low-oxygen, brackish, and nutrient-rich waters. Their demise prior to the peak d 13 C excursion is likely due to a rising sea-level. Characteristic OAE2 anoxic conditions reached this coastal region only at the end of the d 13 C plateau in deeper waters near the end of the Cenomanian. Increased phosphorus accumulations before and after the d 13 C excursion suggest higher oxic conditions and increased detrital input. Bulk-rock and clay mineralogy indicate humid climate conditions, increased continental runoff and a rising sea up to the first d 13 C peak. Above this interval, a dryer and seasonally well-contrasted climate with intermittently dry conditions prevailed. These results reveal the globally synchronous d 13 C shift, but delayed effects of OAE2 dependent on water depth.

show abstract

“…Larson, 1991). In the mid-Cretaceous, extensive epicontinental seas along the Tethyan seaway and the pericontinental seas on the young continental shelves of the North and South Atlantic experienced significant organic matter-rich sedimentation (van Kuhnt and Wiedmann, 1995;Lüning et al, 2004;Emeis and Weissert, 2009). The extent of black shale deposition and the nature of the organic matter depended on palaeogeographical setting and on climate and palaeoceanography (Kuhnt and Wiedmann, 1995;Jímenez Berrocoso et al, 2010;Trabucho-Alexandre et al, 2010;Hofmann and Wagner, 2011;MacLeod et al, 2011;TrabuchoAlexandre et al, 2011).…”

Section: Juvenile Spreading Centre and Expanding Oceanmentioning

confidence: 99%

Phanerozoic environments of black shale deposition and the Wilson Cycle

Trabucho‐Alexandre

Hay²,

Boer

2012

Solid Earth

View full text Add to dashboard Cite

Abstract. The spatial and temporal distribution of black shales is related to the development of environments in which they accumulate and to a propitious combination of environmental variables. In recent years, much has been done to improve our understanding of the mechanisms behind the temporal distribution of black shales in the Phanerozoic and of the environmental variables that result in their deposition. However, the interpretation of ancient black shale depositional environments is dominated by an oversimplistic set of three depositional models that do not capture their complexity and dynamics. These three models, the restricted circulation, the (open) ocean oxygen minimum and the continental shelf models, are an oversimplification of the variety of black shale depositional environments that arise and coexist throughout the course of a basin's Wilson Cycle, i.e. the dynamic sequence of events and stages that characterise the evolution of an ocean basin, from the opening continental rift to the closing orogeny. We examine the spatial distribution of black shales in the context of the Wilson Cycle using examples from the Phanerozoic. It is shown that the geographical distribution of environments of black shale deposition and the position of black shales in the basin infill sequence strongly depend on basin evolution, which controls the development of sedimentary environments where black shales may be deposited. The nature of the black shales that are deposited, i.e. lithology and type of organic matter, also depends on basin evolution and palaeogeography. We propose that in studies of black shales more attention should be given to the sedimentary processes that have led to their formation and to the interpretation of their sedimentary environments.

show abstract

Integrated depositional model for the Cenomanian–Turonian organic-rich strata in North Africa

Cited by 161 publications

References 98 publications

Post-rift vertical movements and horizontal deformations in the eastern margin of the Central Atlantic: Middle Jurassic to Early Cretaceous evolution of Morocco

Post-rift vertical movements and horizontal deformations in the eastern margin of the Central Atlantic: Middle Jurassic to Early Cretaceous evolution of Morocco

Cenomanian–Turonian transition in a shallow water sequence of the Sinai, Egypt

Phanerozoic environments of black shale deposition and the Wilson Cycle

Contact Info

Product

Resources

About