Abrupt deep-sea warming at the end of the Cretaceous

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doi: 10.1130/0091-7613(1998)026<0995:ADSWAT>2.3.CO;2
Author(s): Li, Liangquan; Keller, Gerta
Author Affiliation(s): Primary:
Princeton University, Department of Geosciences, Princeton, NJ, United States
Volume Title: Geology (Boulder)
Source: Geology (Boulder), 26(11), p.995-998. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613 CODEN: GLGYBA
Note: In English. 21 refs.; illus., incl. 1 table
Summary: Climatic and oceanographic variations during the last 2 m.y. of the Maastrichtian inferred from high-resolution (10 k.y.) stable isotope analysis of the mid-latitude South Atlantic Deep Sea Drilling Project Site 525 reveal a major warm pulse followed by rapid cooling prior to the Cretaceous-Tertiary boundary. Between 66.85 and 65.52 Ma, cool but fluctuating temperatures average 9.9 and 15.4°C in intermediate and surface waters, respectively. This interval is followed by an abrupt short-term warming between 65.45 and 65.11 Ma, which increased temperatures by 2-3°C in intermediate waters, and decreased the vertical thermal gradient to an average of 2.7°C. This warm pulse may be linked to increased atmospheric pCO2, increased poleward heat transport, and the switch of an intermediate water source from high to low-middle latitudes. During the last 100 k.y. of the Maastrichtian, intermediate and surface temperatures decreased by an average of 2.1 and 1.4°C, respectively, compared to the maximum temperature between 65.32 and 65.24 Ma.
Year of Publication: 1998
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Atlantic Ocean; Cenozoic; Cretaceous; DSDP Site 525; Deep Sea Drilling Project; Deep-sea environment; Foraminifera; IPOD; Invertebrata; Isotope ratios; Isotopes; K-T boundary; Leg 74; Lower Paleocene; Maestrichtian; Marine environment; Mesozoic; Microfossils; O-18/O-16; Oxygen; Paleo-oceanography; Paleocene; Paleoclimatology; Paleoenvironment; Paleogene; Paleotemperature; Protista; Senonian; South Atlantic; Stable isotopes; Stratigraphic boundary; Tertiary; Upper Cretaceous; Upper Maestrichtian
Coordinates: S290415 S290414 E0025908 E0025907
Record ID: 1999000416
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