Palynological evidence for prolonged cooling along the Tunisian continental shelf following the K–Pg boundary impact

Vellekoop, Johan; Smit, Jan; Schootbrugge, Bas van de; Weijers, Johan W. H.; Galeotti, Simone; Damsté, Jaap S. Sinninghe; Brinkhuis, Henk

doi:10.1016/j.palaeo.2015.03.021

Cited by 52 publications

(48 citation statements)

References 58 publications

(103 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…; Vellekoop et al . ) shows a peak occurrence with very high abundances approximately 20 m below the K–Pg boundary, where it reaches up to 77% of the dinocyst assemblage. Other peridinioid dinocysts, such as representatives of the genera Cerodinium , Deflandrea , Laciniadinium and Alterbidinium , are also abundant throughout the record (1–40% of the assemblage).…”

Section: Resultsmentioning

confidence: 99%

“…; Vellekoop et al . ). Therefore, dinocysts provide an excellent tool for both biostratigraphy and the reconstruction of palaeoenvironmental changes in the coastal setting of the Lefipán Formation.…”

mentioning

confidence: 97%

“…; Kring ; Vellekoop et al . , , ) superimposed on a latest Maastrichtian cooling trend (Olsson et al . ; Habib & Saeedi ; Vellekoop et al .…”

mentioning

confidence: 99%

“…; Vellekoop et al . , ). In addition, dinoflagellates are highly sensitive to changes in environmental parameters such as nutrient loading and salinity (Sluijs et al .…”

mentioning

confidence: 99%

See 3 more Smart Citations

Climate and sea‐level changes across a shallow marine Cretaceous–Palaeogene boundary succession in Patagonia, Argentina

et al. 2017

Self Cite

View full text Add to dashboard Cite

Upper Maastrichtian to lower Paleocene, coarse‐grained deposits of the Lefipán Formation in Chubut Province, (Patagonia, Argentina) provide an opportunity to study environmental changes across the Cretaceous–Palaeogene (K–Pg) boundary in a shallow marine depositional environment. Marine palynological and organic geochemical analyses were performed on the K–Pg boundary interval of the Lefipán Formation at the San Ramón section. The palynological and organic geochemical records from the San Ramón K–Pg boundary section are characteristic of a highly dynamic, nearshore setting. High abundances of terrestrial palynomorphs, high BIT‐index values and the occasional presence of plant fossils are indicative of a large input of terrestrial organic material. The organic‐walled dinoflagellate cyst (dinocyst) assemblage is generally dominated by Senegalinium and other peridinioid dinocyst taxa, indicative of high‐nutrient conditions and decreased salinities, probably associated with a large fluvial input. The reconstructed sea surface temperatures range from 25°C to 27°C, in accordance with the tropical climate inferred by palynological and megafloral studies. As in the Bajada del Jagüel section, ~500 km north‐north‐east of San Ramón, peaks of Senegalinium spp. were recorded below and above the K–Pg boundary, possibly related to enhanced runoff resulting from more humid climatic conditions. The lithological, palynological and organic geochemical records suggest the occurrence of a sea‐level regression across the K–Pg boundary, resulting in a hiatus directly at the boundary in both sections, followed by a transgression in the Danian.

show abstract

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 97%

See 2 more Smart Citations

Climate and sea‐level changes across a shallow marine Cretaceous–Palaeogene boundary succession in Patagonia, Argentina

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…After a brief "impact winter" (months to decades; Bardeen et al, 2017;Brugger et al, 2017;Taylor et al, 2018;Vellekoop et al, 2014Vellekoop et al, , 2015Vellekoop et al, , 2016, temperatures increased between~1 and 6°C depending on paleolatitude and geographic location, with the largest increases often at higher paleolatitudes (MacLeod et al, 2018;Taylor et al, 2018;Vellekoop et al, 2014;Zhang et al, 2018). After a brief "impact winter" (months to decades; Bardeen et al, 2017;Brugger et al, 2017;Taylor et al, 2018;Vellekoop et al, 2014Vellekoop et al, , 2015Vellekoop et al, , 2016, temperatures increased between~1 and 6°C depending on paleolatitude and geographic location, with the largest increases often at higher paleolatitudes (MacLeod et al, 2018;Taylor et al, 2018;Vellekoop et al, 2014;Zhang et al, 2018).…”

Section: K-pg Boundary Comentioning

confidence: 99%

No Evidence for a Large Atmospheric CO₂ Spike Across the Cretaceous‐Paleogene Boundary

Milligan

Royer

Franks

et al. 2019

Geophysical Research Letters

View full text Add to dashboard Cite

Currently, there is only one paleo‐CO2 record from plant macrofossils that has sufficient stratigraphic resolution to potentially capture a transient spike related to rapid carbon release at the Cretaceous‐Paleogene (K‐Pg) boundary. Unfortunately, the associated measurements of stomatal index are off‐calibration, leading to a qualitative interpretation of >2,300‐ppm CO2. Here we reevaluate this record with a paleo‐CO2 proxy based on leaf gas exchange principles. We also test the proxy with three living species grown at 500‐ and 1,000‐ppm CO2, including the nearest living relative of the K‐Pg fern, and find a mean error rate of ~22%, which is comparable to other leading paleo‐CO2 proxies. Our fossils record a ~250‐ppm increase in CO2 across the K‐Pg boundary from ~625 to ~875 ppm. A small CO2 spike associated with the end‐Cretaceous mass extinction is consistent with many temperature records and with carbon cycle modeling of Deccan volcanism and the meteorite impact.

show abstract

Baby, it's cold outside: Climate model simulations of the effects of the asteroid impact at the end of the Cretaceous

Brugger

Feulner

Petri

2017

Geophysical Research Letters

110

View full text Add to dashboard Cite

Sixty‐six million years ago, the end‐Cretaceous mass extinction ended the reign of the dinosaurs. Flood basalt eruptions and an asteroid impact are widely discussed causes, yet their contributions remain debated. Modeling the environmental changes after the Chicxulub impact can shed light on this question. Existing studies, however, focused on the effect of dust or used one‐dimensional, noncoupled atmosphere models. Here we explore the longer‐lasting cooling due to sulfate aerosols using a coupled climate model. Depending on aerosol stratospheric residence time, global annual mean surface air temperature decreased by at least 26°C, with 3 to 16 years subfreezing temperatures and a recovery time larger than 30 years. The surface cooling triggered vigorous ocean mixing which could have resulted in a plankton bloom due to upwelling of nutrients. These dramatic environmental changes suggest a pivotal role of the impact in the end‐Cretaceous extinction.

show abstract

Palynological evidence for prolonged cooling along the Tunisian continental shelf following the K–Pg boundary impact

Cited by 52 publications

References 58 publications

Climate and sea‐level changes across a shallow marine Cretaceous–Palaeogene boundary succession in Patagonia, Argentina

Climate and sea‐level changes across a shallow marine Cretaceous–Palaeogene boundary succession in Patagonia, Argentina

No Evidence for a Large Atmospheric CO₂ Spike Across the Cretaceous‐Paleogene Boundary

Baby, it's cold outside: Climate model simulations of the effects of the asteroid impact at the end of the Cretaceous

Contact Info

Product

Resources

About

Palynological evidence for prolonged cooling along the Tunisian continental shelf following the K–Pg boundary impact

Cited by 52 publications

References 58 publications

Climate and sea‐level changes across a shallow marine Cretaceous–Palaeogene boundary succession in Patagonia, Argentina

Climate and sea‐level changes across a shallow marine Cretaceous–Palaeogene boundary succession in Patagonia, Argentina

No Evidence for a Large Atmospheric CO2 Spike Across the Cretaceous‐Paleogene Boundary

Baby, it's cold outside: Climate model simulations of the effects of the asteroid impact at the end of the Cretaceous

Contact Info

Product

Resources

About

No Evidence for a Large Atmospheric CO₂ Spike Across the Cretaceous‐Paleogene Boundary