Paleoceanography of the Southwestern Western Interior Sea During the Time of the Cenomanian-Turonian Boundary (Late Cretaceous)

Leckie, R. Mark; Yuretich, Richard F.; West, Oona L.O.; Finkelstein, David; Schmidt, Maxine

doi:10.2110/csp.98.06.0101

Cited by 110 publications

(234 citation statements)

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“…The global disappearance of complex K-selected forms with long reproduction cycles (rotaliporoids) at the onset of OAE 2 has been explained by the development of oxygen-depleted conditions in the deeper part of the water column (Leckie, 1987;Leckie et al, 1998;Keller and Pardo, 2004;Caron et al, 2006). This change in the morphology of planktonic foraminifera is also observed in the Chrummflueschlucht section.…”

Section: Planktonic Foraminifera As Environmental Proxiesmentioning

confidence: 93%

“…They dominate the planktonic assemblages from the R. cushmani and the H. helvetica TRZ, which are periods characterized by welloxygenated water with low nutrient levels allowing a specific diversification and the development of more sophisticated morphotypes (Grosheny and Malartre, 1997;Caron et al, 2006;Mort et al, 2007). The second group is composed of globular trochospiral and biserial forms with small and simple morphotypes (e.g., Whiteinella and Heterohelix), which mainly lived in the upper-water column with high nutrient levels (Hart and Leary, 1989;Petters, 1980;Jarvis et al, 1988;Grosheny and Malartre, 1997;Leckie et al, 1998;Keller and Pardo, 2004). They are interpreted as r-selected species (MacArthur and Wilson, 1967) and date from the W. archaeocretacea PRZ.…”

Section: Planktonic Foraminifera As Environmental Proxiesmentioning

confidence: 99%

“…In the sections of Pueblo, Eastbourne and Wunstrof, peak "b" is coeval with the "Heterohelix shift" (Leckie, 1985;Leckie et al, 1991Leckie et al, , 1998Nederbragt and Fiorentino, 1999;Huber et al, 1999;Caron et al, 2006;Jarvis et al, 2006). This event follows the disappearance of complex keeled morphotypes.…”

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confidence: 97%

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Evidence for oxic conditions during oceanic anoxic event 2 in the northern Tethyan pelagic realm

Westermann

Caron

Fiet

et al. 2010

Cretaceous Research

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Upper Cenomanian pelagic sediments from the northern Alpine Helvetic fold-and-thrust belt (northern Tethyan margin) coeval with Oceanic Anoxic Event (OAE) 2 are characterized by the temporal persistence of micrite sedimentation and lack of organic carbon-rich layers. We studied an expanded section in the Chrummflueschlucht (east of Euthal, Switzerland), which encompasses the OAE 2 time interval. In order to identify the paleoceanographic and paleoenvironmental conditions during OAE 2 in this part of the northern Tethyan margin, and more specifically to trace eventual changes in nutrient levels and oxic conditions, we investigated the biostratigraphy (planktonic foraminifera), the bulk-rock mineralogy, and measured stable carbon-and oxygen-isotopes, total phosphorus (P) and redox-sensitive trace-element (RSTE) contents.We were able to determine e with some remaining uncertainties e the different planktonic foraminiferal biozones characteristic of the CenomanianeTuronian boundary interval (Rotalipora cushmani, Whiteinella archaeocretacea and Helvetoglobotruncana helvetica zones). In the lower part of the section (R.cushmani total range zone), the bulk-rock d 13 C record shows a long-term increase. Within sediments attributed to the W. archaeocretacea partial range zone, d13 C values reach a maximum of 3.3& (peak "a").In the following the values decrease and increase again to arrive at a plateau with high d13 C values of around 3.1&, which ends with a peak of 3.3& (peak "c"). At the top of the section, in sediments belonging to the H. helvetica total range zone, d13 C values decrease to post-OAE values of around 2.2&.The last occurrence of R. cushmani is observed just above the positive d 13 C shift characterizing OAE 2. P contents display small variations along the section with a long-term decreasing trend towards the top. Before the OAE 2 interval, P values show higher values and relatively good covariation with detrital input, indicating higher nutrient input before OAE 2. In sediments corresponding to the onset of the d 13 C positive excursion, P content is marked by a sharp peak probably linked to a slowdown in sedimentation rates and/or the presence of a small hiatus, as is shown by the presence of glauconite and phosphatic grains. In the interval corresponding to OAE 2, P values remain low and increase slightly at the end of the positive shift in the d 13 C record (in the H. helvetica total range zone). The average contents of RSTE (U, V, As, Co, Mo and Mn) remain low throughout the section and appreciable RSTE enrichments have not been observed for the sedimentary interval corresponding to OAE 2. No correlation is observed with stratigraphic trends in RSTE contents in organic-rich deeper-water sections. The presence of double-keeled planktonic foraminifera species during most of the Cenomanian/Turonian boundary event is another evidence of relatively well-oxygenated conditions in this part of the northern Tethyan outer shelf.Our results show that the Chrummflueschlucht section corresponds to one of the most...

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Section: Planktonic Foraminifera As Environmental Proxiesmentioning

confidence: 93%

Section: Planktonic Foraminifera As Environmental Proxiesmentioning

confidence: 99%

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Evidence for oxic conditions during oceanic anoxic event 2 in the northern Tethyan pelagic realm

Westermann

Caron

Fiet

et al. 2010

Cretaceous Research

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“…Boltovskoy & Wright, 1976;Gibson, 1989;Van der Zwaan et al, 1990, 1999. Van der Zwaan et al (1990, 1999 and Leckie et al (1998) emphasized the significance of nutrients for the P/B ratio, in particular for benthic foraminifera. Because the density of planktonic and benthic foraminifera depends on the organic flux, and the amount of organic matter reaching the sea floor decreases with increasing water depth because of oxidation, the P/B ratio as anticipated has to increase with depth ( Van der Zwaan et al, 1999).…”

Section: Faunal Parametersmentioning

confidence: 99%

Eastern Mediterranean foraminiferal palaeoecological response to Mid-Late Pliocene climatic regime: A preliminary note.

et al. 2016

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“…The sudden development of heterohelicids (or ''Heterohelix shift'' of Leckie, 1985, Leckie et al, 1998, Meyers et al, 2001and Caron et al, 2006 with probably H. globulosa and H. moremanibut the two species are difficult to distinguish in thin sectionsgives a good regional and sometimes global marker. As named by Huber et al (1999) this ''Heterohelix-dominated assemblage'' is bio-event 2.…”

Section: Planktic Foraminiferamentioning

confidence: 99%

The global bio-events at the Cenomanian-Turonian transition in the reduced Bahloul Formation of Bou Ghanem (central Tunisia)

Robaszynski¹,

Zagrarni²,

Caron

et al. 2010

Cretaceous Research

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In central Tunisia, the thickness of the Bahloul Formation varies generally between 20 to 40 m such as for example, respectively, at wadi Smara near Kalaat Senan and at wadi Bahloul near Maktar. The thickness is also of several tens metres at Koudiat el Azreg near Jerissa and at Tajerouine. In these sites where the thickness of the Bahloul Formation is dilated, in addition to five geochemical events (d 13 C), nine bioevents were defined near the Cenomanian-Turonian transition, successively in ascending order: 1. LO Rotalipora cushmani, 2. Heterohelix bio-event, 3. FO Pseudaspidoceras pseudonodosoides, 4. LO P. pseudonodosoides, 5. LO Thalmanninella multiloculata, 6. ''filaments'' bio-event, Cenomanian-Turonian transition, 7. FO Watinoceras sp., 8. FO Pseudaspidoceras flexuosum, 9. FO Helvetoglobotruncana helvetica. Even though the Bahloul Formation in the Bou Ghanem site is only 7.7 m thick (from which only 2.4 m of laminated black limestones), all nine marker bio-events were recorded, almost in the same order except some small differences. A good number of these bio-events are global as they are also present at Pueblo (Colorado, USA), the stratotype for the base of the Turonian stage. Consequently, at a global scale, it is possible to place the Cenomanian-Turonian boundary with one or several of these bio-events, with a good level of confidence.

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Paleoceanography of the Southwestern Western Interior Sea During the Time of the Cenomanian-Turonian Boundary (Late Cretaceous)

Cited by 110 publications

References 0 publications

Evidence for oxic conditions during oceanic anoxic event 2 in the northern Tethyan pelagic realm

Evidence for oxic conditions during oceanic anoxic event 2 in the northern Tethyan pelagic realm

Eastern Mediterranean foraminiferal palaeoecological response to Mid-Late Pliocene climatic regime: A preliminary note.

The global bio-events at the Cenomanian-Turonian transition in the reduced Bahloul Formation of Bou Ghanem (central Tunisia)

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