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      A latest Cretaceous to earliest Paleogene dinoflagellate cyst zonation from Antarctica, and implications for phytoprovincialism in the high southern latitudes

      , , , ,
      Review of Palaeobotany and Palynology
      Elsevier BV

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          Impact of Antarctic Circumpolar Current development on late Paleogene ocean structure.

          Global cooling and the development of continental-scale Antarctic glaciation occurred in the late middle Eocene to early Oligocene (~38 to 28 million years ago), accompanied by deep-ocean reorganization attributed to gradual Antarctic Circumpolar Current (ACC) development. Our benthic foraminiferal stable isotope comparisons show that a large δ(13)C offset developed between mid-depth (~600 meters) and deep (>1000 meters) western North Atlantic waters in the early Oligocene, indicating the development of intermediate-depth δ(13)C and O(2) minima closely linked in the modern ocean to northward incursion of Antarctic Intermediate Water. At the same time, the ocean's coldest waters became restricted to south of the ACC, probably forming a bottom-ocean layer, as in the modern ocean. We show that the modern four-layer ocean structure (surface, intermediate, deep, and bottom waters) developed during the early Oligocene as a consequence of the ACC.
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            Continental rift to back-arc basin: Jurassic-Cretaceous stratigraphical and structural evolution of the Larsen Basin, Antarctic Peninsula

            B. HATHWAY (2000)
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              Late Cretaceous stratigraphy of the Admiralty Sound region, James Ross Basin, Antarctica

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                Author and article information

                Journal
                Review of Palaeobotany and Palynology
                Review of Palaeobotany and Palynology
                Elsevier BV
                00346667
                February 2012
                February 2012
                : 171
                :
                : 40-56
                Article
                10.1016/j.revpalbo.2011.11.004
                e0a15508-632e-4d25-b277-9e6f5481b0b4
                © 2012

                http://www.elsevier.com/tdm/userlicense/1.0/

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