Pelagic evolution and environmental recovery after the Cretaceous-Paleogene mass extinction

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doi: 10.1130/G21702.1
Author(s): Coxall, Helen K.; D'Hondt, Steven; Zachos, James C.
Author Affiliation(s): Primary:
University of Rhode Island, Graduate School of Oceanography, Narragansett, RI, United States
Other:
University of California at Santa Cruz, United States
Volume Title: Geology (Boulder)
Source: Geology (Boulder), 34(4), p.297-300. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613 CODEN: GLGYBA
Note: In English. 28 refs.; sects.
Summary: The evolutionary recovery of planktic foraminifera from the Cretaceous-Paleogene mass extinction was closely linked to recovery of the marine carbon system. Both the evolutionary recovery and the biogeochemical recovery occurred in two stages. The second stage of evolutionary radiation peaked nearly four million years after the extinction, immediately after the abrupt final recovery of the organic flux to deep waters. The timing of these events suggests that the final postextinction recovery of planktic foraminiferal diversity was directly contingent on the final recovery of the marine carbon cycle. This second radiation was defined by the diversification of tropical photosymbiotic forms that dominated low- and mid-latitude assemblages long into the Eocene. We hypothesize that this diversification was a result of the reappearance of oligotrophic oceans as the organic flux from the surface ocean to deep water fully recovered from the mass extinction.
Year of Publication: 2006
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Adaptive radiation; Atlantic Ocean; Bioclastic sedimentation; Biodiversity; Biogeography; Carbon; Carbon cycle; Cenozoic; Cores; Cretaceous; DSDP Site 528; DSDP Site 577; Deep Sea Drilling Project; Ecosystems; Foraminifera; Geochemical cycle; IPOD; Invertebrata; K-T boundary; Leg 74; Leg 86; Lower Paleocene; Marine environment; Marine sediments; Mass extinctions; Mesozoic; Microfossils; North Pacific; Northwest Pacific; Pacific Ocean; Paleocene; Paleoecology; Paleogene; Pelagic environment; Planktonic taxa; Protista; Recovery; Sedimentation; Sediments; Shatsky Rise; South Atlantic; Stratigraphic boundary; Tertiary; Tropical environment; Upper Cretaceous; Walvis Ridge; West Pacific
Coordinates: N322628 N322632 E1574324 E1574323
S283130 S283129 E0021927 E0021926
Record ID: 2006035345
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States