Latest Cretaceous/Paleocene deep-sea ostracode fauna at IODP Site U1407 (western North Atlantic) with special reference to the Cretaceous/Paleogene boundary and the Latest Danian Event

摘要: Abstract During the Paleocene, marine plankton community recovered its diversity after a severe loss at Cretaceous/Paleogene (K/Pg) boundary. In general, changes in Paleocene deep-sea ostracode faunas are poorly understood. It is still unclear how changed during compelling events such as K/Pg boundary (66.04 Ma) and Latest Danian Event (LDE: ~ 62.18 Ma), transient warming event. this report, we describe study on latest Cretaceous–Late ostracodes from Integrated Ocean Drilling Program Site U1407, off Newfoundland, northwestern Atlantic. Thirty-six taxa were obtained 202 discrete samples that collected interval between 66.3 57.3 Ma. Near boundary, 8% (2 of 25) Maastrichtian became extinct. The extinction rate estimated to be most 0.12 E MSY − 1 , which equal 12% per one million years same range background-level rate. Comparing rates different ocean basins Maud Rise Blake Nose, displays striking geographical heterogeneity. Between Danian, change biofacies dominated by shallow bathyal deep taxa. LDE, display an increase their benthic accumulation taxonomic well relative abundance Krithe crassicaudata simultaneously with decline carbonate content. A similar commonly documented fauna northeastern Atlantic Paleocene–Eocene Thermal Maximum (PETM; 56.0 Ma). contrast PETM fauna, event not recognized. Danian/Selandian show export productivity. After form appears tolerate warm acidified water. Export productivity remains high Selandian Thanetian.