Journal: Cretaceous Research

Abbreviation

Cretac. Res.

Publisher

Academic Press

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ISSN

0195-6671

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Publications 1 - 8 of 8
  • Black shales - from coolhouse to greenhouse (early Aptian)
    Item type: Journal Article
    Giorgioni, Martino; Keller, Christina E.; Weissert, Helmut; et al. (2015)
    Cretaceous Research
  • Palynological and sequence stratigraphic analysis of the Napo Group in the Pungarayacu 30 well, Sub-Andean Zone, Ecuador
    Item type: Journal Article
    Vallejo, C.; Hochuli, P.; Winkler, W.; et al. (2003)
    Cretaceous Research
  • Paleoenvironmental significance of the carbon isotope record across the Cenomanian–Turonian transition and the Oceanic Anoxic Event 2 (OAE2) in the southeastern Neotethys, Zagros, Iran
    Item type: Journal Article
    Bagherpour, Borhan; Nkemata, Andy F.; Vaziri–Moghaddam, Hossein; et al. (2023)
    Cretaceous Research
    A high–resolution carbon isotope record of pelagic carbonates (δ13Ccarb) from the Zagros Mountains, Iran, documents a 1.8‰ positive carbon isotope excursion (CIE) in the southeastern Neotethys during the Cenomanian–Turonian transition, corresponding to Ocean Anoxic Event (OAE2). The succession is controlled by biostratigraphy that includes the Rotalipora cushmani, Whiteinella archaeocretacea, and Helvetoglobotruncana helvetica biozones. The CIE is characterized by a positive shift culminating in a first positive peak (at 3.3‰), followed by a 1‰ negative excursion, accompanied by the highest δ18Ocarb values that can be interpreted as the result of a short–lived global cooling, the Plenus Cold Event. A subsequent second positive peak and a plateau of higher δ18Ocarb values are followed by relatively low values in the earliest Turonian akin to pre–excursion values. The biostratigraphic positions of the three diagnostic maximum points, referred to as peaks A, B, and C, within the generally positive CIE indicate a synchronous δ13Ccarb variability worldwide. The average δ13Ccarb values in southeastern Neotethys are generally lower compared to the open–ocean records of the same period. We attribute this offset to a substantial regional regression combined with recycling of isotopically light organic carbon. The diachronous deposition of black shales/mudstones after the onset of positive CIE suggests that its formation strongly depends on local paleogeography and paleoenvironmental factors.
  • Late Barremian-early Aptian climate of the northern middle latitudes
    Item type: Journal Article
    Zakharov, Yuri D.; Baraboshkin, Eugenij Y.; Weissert, Helmut; et al. (2013)
    Cretaceous Research
  • Carbon-isotope stratigraphy and cyclostratigraphy of shallow-marine carbonates
    Item type: Conference Paper
    Amodio, Sabrina; Ferreri, Vittoria; D'Argenio, Bruno; et al. (2008)
    Cretaceous Research
  • The 9th International Symposium on the Cretaceous System, held on 1-5 September 2013 in Ankara, Turkey
    Item type: Other Journal Item
    Yilmaz, Ismail Omer; Wagreich, Michael; Weissert, Helmut (2015)
    Cretaceous Research
  • The Cenomanian/Turonian anoxic event at the Bonarelli level in Italy and Spain
    Item type: Journal Article
    Mort, Haydon; Jacquat, Olivier; Adatte, Thierry; et al. (2007)
    Cretaceous Research
  • Calcareous nannofossils from the Aptian–Lower Albian of southeast France: palaeoecological and biostratigraphic implications
    Item type: Review Article
    Herrle, Jens O.; Mutterlose, Jörg (2003)
    Cretaceous Research
    The Aptian–lower Albian succession of the Vocontian Basin (SE France) consists of marine hemipelagic sediments including several black shale horizons. The latter are partly of regional and partly of global distribution. This sedimentary succession records the nannoplankton evolution of the Aptian–early Albian interval and thus provides an excellent opportunity to calibrate the calcareous nannofossil record with Tethyan ammonite and planktic foraminiferal biostratigraphy. The calcareous nannofossil biostratigraphy presented in this paper supports previous zonations, but it also provides a much higher resolution and thus improves the correlation of different black shale horizons on a supraregional scale. Up to 23 major (supraregionally significant) and minor (regionally significant) first and last occurrences of calcareous nannofossil taxa are recognized. Nannoconid abundances decrease rapidly in the upper Lower Aptian (nannoconid crisis I, NCI) and in the middle Upper Aptian (nannoconid crisis II, NCII). Both decreases correlate with carbonate–platform drowning events. The upper Lower Aptian interval above the NCI is characterized by high abundances of large specimens of Assipetra infracretacea and Rucinolithus terebrodentarius probably of supraregional significance. The uppermost Aptian–Lower Albian is characterized by high abundances of the calcareous nannoplankton taxon Repagulum parvidentatum, reflecting boreal influence on the Tethyan Realm. This suggests a temporary decrease in surface-water temperatures in the Vocontian Basin. © 2003 Elsevier Ltd.
Publications 1 - 8 of 8