Boreal Early Turonian Calcareous Nannofossils From Nearshore Settings—implications for Paleoecology

Linnert, Christian; Mutterlose, Jörg

doi:10.2110/palo.2014.099

Cited by 17 publications

(15 citation statements)

References 59 publications

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“…Difficulties with the interpretation of supposed eutrophic taxa (e.g., B. constans, small Zeugrhabdotus spp.) were previously discussed by Lees et al [2005], Mutterlose et al [2005], and Linnert and Mutterlose [2015]. These authors suggest that ecological factors such as competition with other organisms, light, salinity, and temperature may have been underestimated in past interpretations.…”

Section: Paleofertility Index Taxamentioning

confidence: 86%

“…[], Mutterlose et al . [], and Linnert and Mutterlose []. These authors suggest that ecological factors such as competition with other organisms, light, salinity, and temperature may have been underestimated in past interpretations.…”

Section: Discussionmentioning

confidence: 99%

“…The input of siliciclastic material is coupled with other variables, including nutrients, fresh water input, and light attenuation. All these factors affected phytoplankton communities [e.g., Linnert and Mutterlose , ]. The Kronsmoor section (Figure ) exhibits CaCO 3 values which increase from ~90% in the lower part to ~97% in the upper part [ Voigt and Schönfeld , ], consequently the siliciclastic input decreased from ~10% to ~3%.…”

Section: Discussionmentioning

confidence: 99%

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The impact of the Maastrichtian cooling on the marine nutrient regime—Evidence from midlatitudinal calcareous nannofossils

et al. 2016

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The latest Campanian-earliest Maastrichtian interval is well known as a period of intense climate cooling. This cooling caused a distinctive bipolar biogeographic distribution of calcareous nannofossil assemblages: High-latitude settings were dominated by newly evolving endemic taxa, former cosmopolitan species disappeared at the same time, and equatorial communities experienced an invasion of cool water taxa. The impact of this cooling on northern midlatitude assemblages is, however, less well known. In order to overcome this gap we studied the Kronsmoor section (northwest Germany). This section provides a continuous upper Campanian-lower Maastrichtian succession with moderately to well preserved nannofossils. Uppermost Campanian assemblages are dominated by Prediscosphaera cretacea; other common taxa include Prediscosphaera stoveri, Watznaueria barnesiae, and Micula staurophora. The lower Maastrichtian is characterized by lower numbers of P. cretacea and frequent Kamptnerius magnificus, Arkhangelskiella cymbiformis, and Cribrosphaerella ehrenbergii. These changes reflect, in part, the Campanian-Maastrichtian boundary cooling since some successful taxa (e.g., K. magnificus) are related to cool surface waters. Other shifts in the nannofossil communities were perhaps the result of a changing nutrient regime. Stronger latitudinal gradients may have increased wind velocities and thus the eolian input of ferruginous dust required by N-fixing bacteria. The enhanced high-latitude deep water formation probably changed the bottom water environment in disfavor of denitrificating organisms. A decline of chemical weathering and fluviatile transport may have reduced the amount of bioavailable phosphate. These processes led to an increased nitrate and a decreased phosphate content shifting the nutrient regime from nitrate toward phosphate limitation.

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Section: Paleofertility Index Taxamentioning

confidence: 86%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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The impact of the Maastrichtian cooling on the marine nutrient regime—Evidence from midlatitudinal calcareous nannofossils

et al. 2016

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“…Significant differences in the relative timing of Turonian planktonic foraminiferal and calcareous nannofossil bioevents and their inter-correlation have led to uncertainties in the chronostratigraphic framework applied in various studies. For example, the first appearance datum (FAD) of the calcareous nannofossil Quadrum gartneri Prins and Perch-Nielsen (in Manivit et al 1977), is within or just above the uppermost portion of the positive δ 13 C excursion that defines OAE2 (Tsikos et al 2004, Linnert andMutterlose 2015) and below the FAD of the planktonic fora minifer Helvetoglobotruncana helvetica (Bolli 1945), whereas GTS 2012 onsiders these FADs to be synchronous. Similarly, the relative order of the FAD of Eiffellithus eximius (Stover 1966) and the last appearance datum (LAD) of H. helvetica and the assigned ages also differ considerably among various studies and geological time scale schemes (see discussion in Huber and Petrizzo 2014, p. 46).…”

Section: Introductionmentioning

confidence: 99%

Correlation of Turonian continental margin and deep-sea sequences in the subtropical Indian Ocean sediments by integrated planktonic foraminiferal and calcareous nannofossil biostratigraphy

Huber¹,

Petrizzo²,

Watkins³

et al. 2017

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Marine mudstone sediments recovered from multiple boreholes drilled in southeast Tanzania yield some of the best preserved Turonian microfossils in the world, and these specimens provide a valuable new perspective on planktonic foraminiferal and calcareous nannofossil evolution, taxonomy, biostratigraphy, and biodiversity. High sedimentation rates and the consistent presence of well-preserved microfossil assemblages throughout the sequence increase the resolution of biostratigraphic data generated allowing for improved correlation within and outside the depositional basin. The late early-middle Turonian Tanzanian record reveals prolonged species stasis with essentially no changes in relative abundance, no extinctions, and no evolutionary appearances for both calcareous plankton groups until the late middle Turonian. This interval is followed in the late Turonian by two species turnovers. The older of these occurs at the top of the mid-Turonian Helvetoglobotruncana helvetica Zone, where last occurrences of three planktonic foraminiferal species are followed, within several meters, by first occurrences of five foraminiferal species and an increase in the abundance of dwarfed planktonic forms. Changes in the calcareous nannofossil assemblages at this level are modest and include the extinction of one calcareous nannofossil species and an abrupt but temporary spike in the abundance of another species. There are no obvious changes in lithology, bulk sediment geochemistry, or stable isotope values across this first turnover event. The second, larger species turnover occurs at a hiatus within the late Turonian Marginotruncana sinuosa-Huberella huberi Zone and is marked by extinction of three calcareous nannofossil species followed by first appearances of four calcareous nannofossil species. Corresponding with the nannofossil first occurrences is a dramatic increase in the relative abundance of several species of biserial planktonic foraminifera, an increase in average grain size, and a shift in preservation

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“…Instable conditions with well-mixed surface waters and an increased influx of nutrient-enriched deep-waters. Climatic phases afterBodin et al (2015); oceanography modified afterGale et al (2000) andLinnert & Mutterlose (2015); absolute ages afterGradstein (2012).…”

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confidence: 99%

Paleoecology of Late Cretaceous Coccolithophores: Insights From the Shallow‐Marine Record

Püttmann

Mutterlose

2021

Paleoceanog and Paleoclimatol

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Key Points • Coccolithophore abundance and diversity patterns from nearshore and offshore deposits of Late Cretaceous age (100-66 Ma) have been studied • The shallow marine successions of the Late Cretaceous greenhouse world provided, unexpectedly, highly diverse coccolithophore assemblages • The findings allow to reconstruct Late Cretaceous marine environments and the paleoecology of coccolithophores

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Boreal Early Turonian Calcareous Nannofossils From Nearshore Settings—implications for Paleoecology

Cited by 17 publications

References 59 publications

The impact of the Maastrichtian cooling on the marine nutrient regime—Evidence from midlatitudinal calcareous nannofossils

The impact of the Maastrichtian cooling on the marine nutrient regime—Evidence from midlatitudinal calcareous nannofossils

Correlation of Turonian continental margin and deep-sea sequences in the subtropical Indian Ocean sediments by integrated planktonic foraminiferal and calcareous nannofossil biostratigraphy

Paleoecology of Late Cretaceous Coccolithophores: Insights From the Shallow‐Marine Record

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