Biotic changes linked to a minor anoxic event (Faraoni Level, latest Hauterivian, Early Cretaceous)

Enrichment of redox-sensitive trace metals (U, V, Mo, As) associated with the late Hauterivian Faraoni oceanic anoxic event

“…This second-order transgression may have lead to the flooding of large epicontinental areas. Bodin et al (2006) pointed out the role of this mechanism as the main trigger for the onset of anoxic conditions during the Faraoni anoxic event, by increased nutrient delivery, and the related increase in primary productivity (see also Company et al 2005). Baudin et al (2002) also proposed increased primary productivity as the prime factor leading to the origin of the Faraoni event along the line of the scenario proposed here.…”

“…In contrast to the anoxic events in the Valanginian, the early Aptian, and near the Cenomanian/Turonian boundary (e.g. Schlanger and Jenkyns 1976;Schlanger et al 1987;Lini et al 1992;Jones and Jenkyns 2001;Sanfourche and Baudin 2001), the Faraoni Level is not accompanied by a major carbon isotope excursion toward more positive values, but rather by a small long-term increase culminating around the Faraoni event (Fö llmi et al 1994;Erba et al 1999; Van de Schootbrugge et al 2000;Company et al 2005;Godet et al 2006). Furthermore, no major volcanic episode has, of yet, been identified for the late Hauterivian.…”

“…An important difference between the Faraoni event and other Cretaceous OAE's consists, however, in the fact that the anoxic event is not mirrored by a major shift in the carbonisotope record (e.g. Erba et al 1999;Van de Schootbrugge et al 2000;Company et al 2005;Godet et al 2006), but only by a small positive excursion (0.5&). Godet et al (2006) explain this attenuated signal by a buffering effect on the carbon-isotope record exerted by the large size of the oceanic dissolved inorganic carbon reservoir.…”

Pseudothurmanniid ammonites from quarries near Lietavská Lúčka and their stratigraphical significance (Late Hauterivian, Central Western Carpathians, Slovakia)

“…With ref er ence to the pub lished data re gard ing Late Hauterivian ammonite biostratigraphy (e.g., Vermeulen et al, 2002;Com pany et al, 2003Com pany et al, , 2005Vermeulen, 2004;Reboulet et al, 2014) and biostratigraphy and se quence stra tig ra phy (Hoedemaeker, 2002(Hoedemaeker, , 2003(Hoedemaeker, , 2013 with re spect to the de tailed stra tig ra phy of the sec tions stud ied, we have in clined to the adop tion of the rel a tively sim ple ammonite zonation as proposed by Hoedemaeker (2013) for the Up per Hauterivian in the sec tions at Río Argos. This shows the fol low ing ammonite zones in se quence: Ligatus, Balearis, Ohmi and Catulloi.…”

Bridging the Faraoni and Selli oceanic anoxic events: late Hauterivian to early Aptian dysaerobic to anaerobic phases in the Tethys

“…A coeval equivalent of the Faraoni Level was subsequently found in northeastern Italy (eastern part of the Trento Plateau and Lessini Mountains; Cecca et al, 1996;Baudin et al, 1997;Cismon, Venetian Alps;Erba et al, 1999;Tremolada et al, 2009) and in the southern Swiss Alps (Breggia; Bersezio et al, 2002). In the following, other Faraoni equivalents were identified outside the central Tethyan realm, such as in the Vocontian Basin (Vergons; Baudin et al, 1999), Ultrahelvetic Basin (Veveyse de Châtel St. Denis; Busnardo et al, 2003), and in the Rio Argos section of the Subbetic unit in Spain (Company et al, 2005). Further possible expressions of the Faraoni anoxic episode have been observed in northwestern Sicily (Bellanca et al, 2002;Baudin, 2005;Coccioni et al, 2006), offshore Portugal and Morocco (DSDP Sites 370 and 398; Baudin, 2005), the North Sea area (Mutterlose and Ruffell, 1999), and in the central and northwestern Pacific (Resolution Guyot, ODP Sites 865 and 866; Baudin et al, 1995;Izu-Mariana margin, ODP Site 1149;Shipboard Scientific Party, 2000;.…”