Pliocene-Pleistocene diatom biostratigraphy of nearshore Ant

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TitlePliocene-Pleistocene diatom biostratigraphy of nearshore Antarctica from the AND-1B drillcore, McMurdo SoundAbstractThe near-shore open-marine diatom record recovered in the ANtarctic geological DRILLing (ANDRILL) McMurdo Ice Shelf Project (MIS) AND-1B drillcore, McMurdo Sound, Antarctica, advances our understanding of the marine conditions present in the southern Ross Sea during the Pliocene and early Pleistocene. This diatom history is recorded within alternating diamictite and diatomite that reflect alternating glacial activity and high marine primary productivity. The diatomite units were deposited in a continental shelf open-marine setting during periods of reduced ice cover in West Antarctica. A new diatom biostratigraphic scheme spanning the last ca. 5Ma is proposed for the Antarctic near-shore area, based on prior work from high latitude drillcores. Four new zones are proposed for the Pliocene/Pleistocene, with eight in total for the new zonal scheme, utilizing Actinocylus fasciculatus, Actinocyclus maccollumii, Fragilariopsis bohatyii, Rouxia antarctica, and Thalassiosira fasciculata as new zonal markers. The early Pliocene shares the most assemblage commonality with that of the Southern Ocean with greater numbers of endemic species observed in the late Pliocene and early Pleistocene; a group of related Fragilaripsis species characterizes much of this later part of the time column. Two new species are proposed, Fragilariopsis tigris sp. nov. Riesselman and Thalassiosira teres sp. nov. Winter; a formal name is also proposed for another species, Rhizosolenia harwoodii sp. nov. Winter. The new zonation is tied to a robust chronology utilizing diatom biostratigraphy, volcanic 40Ar/ 39Ar ages and magnetostratigraphy. â"' 2010 Elsevier B.V.AcknowledgementsThe reviewers and editor provided many excellent comments, greatly improving this paper. The basis for figure three is the result of work by Dr. Richard Levy, his kindness in sharing it is much appreciated. This material is based upon work supported by the National Science Foundation under Cooperative Agreement No. 0342484 through subawards administered by the ANDRILL Science Management Office at the University of Nebraska--Lincoln, and issued through Northern Illinois University (for the MIS Project), as part of the ANDRILL U.S. Science Support Program. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. The ANDRILL (ANtarctic geologic DRILLing) Program is a multinational collaboration between the Antarctic Programs of Germany, Italy, New Zealand and the United States. Antarctica New Zealand is the project operator and has developed the drilling system in collaboration with Alex Pyne at Victoria University of Wellington and Webster Drilling and Exploration. The U.S. Antarctic Program (USAP) and Raytheon Polar Services Corporation (RPSC) supported the science team at McMurdo Station and in the Crary Science and Engineering Laboratory, while Antarctica New Zealand supported the drilling team at Scott Base. Scientific studies are jointly supported by the US National Science Foundation, NZ Foundation for Research, the Italian Antarctic Research Program, the German Science Foundation and the Alfred Wegener Institute.

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1st AuthorWinter, D.AuthorWinter, D.Sjunneskog, C.Scherer, R.Maffioli, P.Riesselman, C.Harwood, D.Year2012JournalGlobal and Planetary ChangeVolume96-97Pages59-74DOI10.1016/j.gloplacha.2010.04.004URLhttps://www.scopus.com/inward/recor.....68520390b5ac84e97c1aae021KeywordsAND-1BANDRILLAntarcticaDiatomLate NeogenePleistocenePlioceneRoss Sea, Coastal engineeringOffshore oil wells, Biostratigraphy, argon isotopebiostratigraphycontinental shelfcontinental slopediamictitediatomdiatomitedrillingendemic speciesgeochronologyglacial historyice covermagnetostratigraphymarine environmentmicropaleontologynearshore environmentpaleoceanographyPliocene-Pleistocene boundaryprimary production, AntarcticaEast AntarcticaMcMurdo Ice ShelfMcMurdo SoundSouthern Ocean, BacillariophytaFragilariopsisNitzschia albaRhizosoleniaThalassiosiraZanclea, rank1Author KeywordsAND-1BANDRILLAntarcticaBiostratigraphyDiatomLate NeogenePleistocenePlioceneRoss Sea

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TypeArticleCitationWinter, D., Sjunneskog, C., Scherer, R., Maffioli, P., Riesselman, C. and Harwood, D. (2012) Pliocene-Pleistocene diatom biostratigraphy of nearshore Antarctica from the AND-1B drillcore, McMurdo Sound. Global and Planetary Change, 96-97(October–November): 59-74 doi:10.1016/j.gloplacha.2010.04.004 IdentifierWinter2012Relevancerank1