georefid:2001-006844SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=2001-0068441999-01-01publicationgeorefid:2001-006844Eyles, NicholasUniversity of Toronto at Scarborough, Environmental Earth Sciences, Scarborough, ON, CanadaauthorDaniels, JamesUniversity of Melbourne, AustraliaauthorOsterman, Lisa E.Smithsonian Institution, United StatesauthorJanuszczak, NicoleauthorGeological Society of America (GSA), Boulder, CO, United StatespublisherdocumentHardcopyIn: Anonymous, Geological Society of America, 1999 annual meeting31 (7)56The glacially-influenced Cenozoic continental margin of Antarctica has a large-scale internal structure that consists of flat-lying "topsets" recording episodic aggradation of the continental shelf, resting on seaward-dipping, wedge-shaped "foresets" formed by the progradation of the continental slope. Ocean Drilling Program Leg 178 (February-April 1998) drilled two sites (1097, 1103) through the outer Antarctic Peninsula Pacific continental shelf into strata no older than late Miocene or early Pliocene (<4.6 Ma). Site 1097 lies on the outer shelf and reached a maximum depth drilled of 420 m below the sea floor (mbsf). Strata consist of thick intervals of massive diamictite, containing large amounts of reworked and abraded marine microfauna, interpreted as tills produced by subglacial re-working of marine sediments. Tills are separated by bioturbated muds with dropstones and contain a diverse in situ fauna. The sedimentary record at Site 1097 is consistent with aggradation of a "topset" by till deposition alternating with open marine sedimentation. Site 1103, close to the shelf edge, reached a depth of 363 mbsf through massive and chaotically-stratified diamictites with graded siltstones consistent with deposition on a slope "foreset" and progradation of the continental slope by deposition of debrites and turbidites.completedStratigraphySedimentary petrologyaggradationAntarctic PeninsulaAntarcticaargillitebiogenic structuresbioturbationCenozoicclastic rocksclastic sedimentscontinental margincontinental shelfdebritedepositiondepositional environmentdiamictiteglacial environmentLeg 178lower Pliocenemarine environmentmarine sedimentsMiocenemudNeogeneOcean Drilling ProgramODP Site 1097ODP Site 1103Plioceneprogradationsedimentary rockssedimentary structuressedimentsstratificationTertiarythicknesstillturbiditeupper Mioceneurn:org.iodp:exp:178urnlargerWorkCitationcampaignurn:org.iodp:exp:178:site:1097urnlargerWorkCitationstudyurn:org.iodp:exp:178urnlargerWorkCitationcampaignurn:org.iodp:exp:178:site:1103urnlargerWorkCitationstudyurn:org.iodp:exp:178urnlargerWorkCitationcampaignEnglishgeoscientificInformation-77.3000-56.3000-77.0000-63.0000Antarctic Peninsula