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ANDRILL-Southern McMurdo Sound (SMS) Project: Early Miocene to Recent paleoclimate and Geological History of the Victoria Land Basin, Antarctica

During the past austral summer season, the ANtarctic geological DRILLing Program (ANDRILL) successfully completed the drilling phase of its second project: the Southern McMurdo Sound Project (SMS). Completed in early December 2007, the AND-2A
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  See discussions, stats, and author profiles for this publication at: ANDRILL-Southern McMurdo Sound (SMS)Project: Early Miocene to Recent paleoclimateand Geological History of the... Conference Paper  · January 2009 CITATIONS 0 READS 9 5 authors , including: Some of the authors of this publication are also working on these related projects: Paleoceanography of the Brazilian Equatorial Margin (BEM)   View projectPRIMARY PRODUCTIVITY IN OCEANS STUDYING MAGNETOTACTIC BACTERIA IN SEDIMENTS   ViewprojectFlorindo FabioNational Institute of Geophysics and Volcano… 322   PUBLICATIONS   3,935   CITATIONS   SEE PROFILE David M. HarwoodUniversity of Nebraska at Lincoln 237   PUBLICATIONS   3,762   CITATIONS   SEE PROFILE F. M. TalaricoUniversità degli Studi di Siena 188   PUBLICATIONS   2,282   CITATIONS   SEE PROFILE All content following this page was uploaded by Florindo Fabio on 28 March 2015.The user has requested enhancement of the downloaded file.  Geophysical Research Abstracts,Vol. 11, EGU2009-13417, 2009EGU General Assembly 2009© Author(s) 2009 ANDRILL-Southern McMurdo Sound (SMS) Project: Early Miocene toRecent paleoclimate and Geological History of the Victoria Land Basin,Antarctica F. Florindo (1), D. Harwood (2), R. Levy (3), F. Talarico (4), and SMS Science Team (5) (1) Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy (, 0039 0651860397), (2) Dept. of Geosciences and ANDRILL SMO, University of Nebraska - Lincoln, USA, (3) GNS Science, Wellington, NZ, (4) Universita’di Siena, Dipartimento di Scienze della Terra, Siena, Italy , (5) During the past austral summer season, the ANtarctic geological DRILLing Program (ANDRILL) successfullycompleted the drilling phase of its second project: the Southern McMurdo Sound Project (SMS). Completed inearly December 2007, the AND-2A drill-hole (77° 45.488 S; 165° 16.613 E) was successfully recovered from a [U+FB02] oating sea-ice platform (8.5 meters thick), over 380 meters of water, reaching a total depth of 1138.54mbsf (98% core-recovery). A chief objective was to recover sediment from the middle Miocene, which has longbeenheldasoneofthefundamentaltimeintervalsindevelopmentofthemodernAntarcticicesheets.TheAND-2Adrillcorerecovered several distinct stratigraphicintervalsseparated by disconformities: (1) alower Miocenesection(1138.54 up to c. 800 mbsf) correlative with an interval previously recovered during Cape Roberts Project drilling;(2) a 600 m-thick early and middle Miocene interval (800-223mbsf), including an expanded section through twoMiocene climatic optima and truncated by a c. 7 m.y. disconformity; and (3) an upper Miocene-Recent interval(uppermost 223 meters) that is thinner but correlative with parts of the upper Neogene section recovered by theANDRILL MIS Project in drill core AND-1B. Shallow marine deposits dominate the lower AND-2A section untilc. 1.5 Ma when the basin deepened rapidly in response to volcanic loading by Mt Erebus. Lower and middleMiocene strata record periodic lithological changes that reflect variation in sea level, glacial proximity, and climateintheSWRossSeabetweenc.20-14.5Ma.Sedimentdepositedclosetoorbeneathgroundedglaciersalternatewithfine-grained marine sediments, providing clear evidence for cycles of ice advance, followed by substantial retreatduring climate transitions to warmer conditions. Fossil assemblages preserved in these strata suggest non-polarclimate conditions, similar to southern Patagonia today, influenced by high sediment discharge from river run-off and high coastal turbidity. An excellent chronostratigraphy for the AND-2A drillcore developed from combinedbiostratigraphy, magnetostratigraphy and radiometric dating of abundant tephra and volcanic materials, providesage control for the drillhole and the network of seismic lines in the western Ross Sea.
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