The last occurrence of Proboscia curvirostris in the North Atlantic marine isotope stages 9-8

Type Article
Date 2001-02
Language English
Author(s) Koc N1, Labeyrie L2, Manthe S2, Flower Bp3, Hodell Da4, Aksu A5
Affiliation(s) 1 : Norwegian Polar Inst, Polar Environm Ctr, N-9296 Tromso, Norway.
2 : CEA, CNRS, Ctr Faibles Radioact, F-91198 Gif Sur Yvette, France.
3 : Univ S Florida, Dept Marine Sci, St Petersburg, FL 33701 USA.
4 : Univ Florida, Dept Geol, Gainesville, FL 32611 USA.
5 : Mem Univ Newfoundland, Ctr Earth Resources Res, Dept Earth Sci, St Johns, NF A1B 3X5, Canada.
Source Marine Micropaleontology (0377-8398) (Elsevier Science Bv), 2001-02 , Vol. 41 , N. 1-2 , P. 9-23
DOI 10.1016/S0377-8398(00)00054-2
WOS© Times Cited 7
Keyword(s) biostratigraphy, North Atlantic, diatoms, Pleistocene, paleoceanography, isotope stratigraphy, oxygen
Abstract Well-preserved diatoms are present in high sedimentation rate Pleistocene cores retrieved on ocean Drilling Program (ODP) Legs 151, 152, 162 and IMAGES cruises of RN Marion Dufresne from the North Atlantic. Investigation of the stratigraphic occurrence of diatom species shows that the youngest diatom event observed in the area is the last occurrence (LO) of Proboscia curvirostris (Jouse) Jordan and Priddle. P. curvirostris is a robust species that can easily be identified in the sediments, and therefore can be a practical biostratigraphic tool. We have mapped its: areal distribution, and found that it stretches from 40 degreesN to 80 degreesN in the North Atlantic. Further, we have correlated the LO P. curvirostris to the oxygen isotope records of six cores to refine the age of this biostratigraphic event. The extinction of P. curvirostris is latitudinally diachronous through Marine Isotope Stages (MIS) 9 to 8 within the North Atlantic. This is closely related to the paleoceanography of the area. P. curvirostris first disappeared within interglacial MIS 9 (324 ka) from the northern areas that are most sensitive to climatic forcing, like the East Greenland current and the sea-ice margin. It survived in mid-North Atlantic until the conditions of the MIS 8 (glaciation) became too severe (260 ka). In the North Pacific at ODP site 883 the LO P. curvirostris falls within MIS 8. The observed overlap in age between the North Atlantic and the North Pacific strongly suggests that the extinction of P. curvirostris is synchronous between these oceans.
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