TY - JOUR
T1 - Early Cretaceous palaeoceanography of the Greenland-Norwegian Seaway evidenced by calcareous nannofossils
AU - Pauly, Sebastian
AU - Mutterlose, Jörg
AU - Alsen, Peter
PY - 2012/6
Y1 - 2012/6
N2 - Reconstructions of the palaeoclimate of the Early Cretaceous are controversial, varying from a warm-temperate greenhouse world to icehouse conditions. We studied calcareous nannofossil assemblages of sediments from North-East Greenland (Wollaston Forland and Kuhn Ø) of Late Ryazanian-Barremian age in order to better understand the palaeoclimate and palaeoceanography of the high latitudes. The calcareous nannofossil assemblages are characterized by abundant Crucibiscutum spp. and Watznaueria spp., Biscutum constans and other Boreal taxa. They show also influxes of Tethyan and low to mid latitudinal taxa like nannoconids (e.g. Nannoconus bermudezii, Nannoconus dolomiticus, Nannoconus steinmannii), pentaliths (Micrantholithus hoschulzii, Micrantholithus obtusus), conuspheres, Speetonia colligata and Cruciellipsis cuvillieri in the Upper Ryazanian and Lower Hauterivian. Reconstructed surface water conditions, indicated by fluctuations in the assemblage compositions, suggest cool conditions for the Late Ryazanian, a cold climate for the Valanginian, and warm climatic conditions for the Hauterivian-Barremian. High meridonial temperature gradients and cool-cold climatic conditions in the high latitudes caused supposedly the formation of deep water in the South Anyui Gulf in the Late Ryazanian-Valanginian. Palaeoceanographic changes, reflected in a counter-balanced ocean current system in the Greenland-Norwegian Seaway, allowed Tethyan biota to spread as far north as North-East Greenland during the Late Ryazanian.
AB - Reconstructions of the palaeoclimate of the Early Cretaceous are controversial, varying from a warm-temperate greenhouse world to icehouse conditions. We studied calcareous nannofossil assemblages of sediments from North-East Greenland (Wollaston Forland and Kuhn Ø) of Late Ryazanian-Barremian age in order to better understand the palaeoclimate and palaeoceanography of the high latitudes. The calcareous nannofossil assemblages are characterized by abundant Crucibiscutum spp. and Watznaueria spp., Biscutum constans and other Boreal taxa. They show also influxes of Tethyan and low to mid latitudinal taxa like nannoconids (e.g. Nannoconus bermudezii, Nannoconus dolomiticus, Nannoconus steinmannii), pentaliths (Micrantholithus hoschulzii, Micrantholithus obtusus), conuspheres, Speetonia colligata and Cruciellipsis cuvillieri in the Upper Ryazanian and Lower Hauterivian. Reconstructed surface water conditions, indicated by fluctuations in the assemblage compositions, suggest cool conditions for the Late Ryazanian, a cold climate for the Valanginian, and warm climatic conditions for the Hauterivian-Barremian. High meridonial temperature gradients and cool-cold climatic conditions in the high latitudes caused supposedly the formation of deep water in the South Anyui Gulf in the Late Ryazanian-Valanginian. Palaeoceanographic changes, reflected in a counter-balanced ocean current system in the Greenland-Norwegian Seaway, allowed Tethyan biota to spread as far north as North-East Greenland during the Late Ryazanian.
KW - Calcareous nannofossils
KW - Early Cretaceous
KW - North-East Greenland
KW - Palaeoceanography
KW - Palaeoclimate
KW - Palaeoecology
UR - http://www.scopus.com/inward/record.url?scp=84861690043&partnerID=8YFLogxK
U2 - 10.1016/j.marmicro.2012.04.004
DO - 10.1016/j.marmicro.2012.04.004
M3 - Article
VL - 90-91
SP - 72
EP - 85
JO - Marine Micropaleontology
JF - Marine Micropaleontology
SN - 0377-8398
ER -