Latitudinal migration of calcareous nannofossil Micula murus in the Maastrichtian; implications for global climate change

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doi: 10.1130/G30326.1
Author(s): Thibault, Nicolas; Gardin, Silvia; Galbrun, Bruno
Author Affiliation(s): Primary:
University of Copenhagen, Department of Geography and Geology, Copenhagen, Denmark
Université Pierre et Marie Curie Paris, France
Volume Title: Geology (Boulder)
Source: Geology (Boulder), 38(3), p.203-206. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613 CODEN: GLGYBA
Note: In English. With GSA Data Repository Item 2010057. 23 refs.; illus., incl. sect., 1 table, sketch map
Summary: Micula murus is one of the main calcareous nannofossil biostratigrapic markers of Tethyan and Intermediate provinces in the upper Maastrichtian (uppermost Cretaceous). A review of its first occurrence at 14 deep-sea sites and sections shows that it is time transgressive from the Tropical Realm of the Atlantic and Pacific Oceans to the intermediate latitudes of the North Atlantic, South Atlantic, Indian Ocean, and the northern Tethys. M. murus remained confined to the Tropical Realm for ∼1.2 m.y. in the early-late Maastrichtian, thus supporting high-latitudinal thermal gradients. It subsequently spread out in the late Maastrichtian to temperate latitudes and to the Tethys in coincidence with the onset of a thermohaline circulation change ca. 67.5 Ma, suggesting a major change in surface-water circulation and interocean communications.
Year of Publication: 2010
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Atlantic Ocean; Biochronology; Biogeography; Biomarkers; Biostratigraphy; Biozones; Climate change; Cretaceous; Deep-sea environment; Demerara Rise; Equatorial Atlantic; First occurrence; Foraminifera; Global change; Invertebrata; Leg 207; Maestrichtian; Magnetostratigraphy; Marine environment; Marine sediments; Mesozoic; Microfossils; Micula murus; Migration; Nannofossils; North Atlantic; Northwest Atlantic; ODP Site 1258; ODP Site 1260; Ocean Drilling Program; Pacific Ocean; Paleo-oceanography; Paleoclimatology; Paleogeography; Paleolatitude; Planktonic taxa; Plantae; Protista; Sediments; Senonian; Tethys; Tropical environment; Upper Cretaceous; West Atlantic
Coordinates: N092600 N092600 W0544400 W0544400
N091600 N091600 W0543300 W0543300
Record ID: 2010030920
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