georefid:2010-048006SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-07-06T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.2204/iodp.pr.318.20102010-01-01publicationgeorefid:2010-048006issn:1932-9423doi:10.2204/iodp.pr.318.2010Brinkhuis, HendrikUtrecht University, Institute of Environmental Biology, Utrecht, NetherlandsauthorEscutia Dotti, CarlotaUniversite de Granada, SpainauthorKlaus, AdamIntegrated Ocean Drilling Program, United StatesauthorFehr, AnnickRWTH Aachen University, Federal Republic of GermanyauthorWilliams, TrevorLamont-Doherty Earth Observatory, United StatesauthorBendle, James A. P.University of Glasgow, United KingdomauthorBijl, Peter K.University of Southampton, United KingdomauthorBohaty, Steven M.Colorado School of Mines, United StatesauthorCarr, Stephanie A.Stanford University, United StatesauthorDunbar, Robert B.Western Michigan University, United StatesauthorGonzalez, Jhon J.Kochi University, JapanauthorHayden, Travis G.Japan Agency for Marine-Earth Science and Technology, JapanauthorIwai, MasaoKorea Institute of Geoscience and Mineral Resources, South KoreaauthorJimenez-Espejo, Francisco J.Victoria University of Wellington, New ZealandauthorKatsuki, KotaDaito Bunka University, JapanauthorKong, Gee SooUniversity of South Florida-Tampa, United StatesauthorMcKay, Robert M.Montclair State University, United StatesauthorNakai, MutsumiCUNY-Queens College, United StatesauthorOlney, Matthew P.University of Frankfurt, Federal Republic of GermanyauthorPasschier, SandraUniversity of Bremen, Federal Republic of GermanyauthorPekar, Stephen F.Utsunomiya University, JapanauthorPross, JoergGeological Survey of India, IndiaauthorRiesselman, ChristinaUniversitet i Tromso, NorwayauthorRoehl, UrsulaGraduate University of Advanced Study, JapanauthorSakai, ToyosaburoScripps Institution of Oceanography, United StatesauthorShrivastava, Prakash KumarTongjii University, ChinaauthorStickley, Catherine E.Imperial College London, United KingdomauthorSugisaki, SaikoUniversity of Queensland, AustraliaauthorTauxe, LisaUniversity of Tokyo, JapanauthorTuo Shoutingauthorvan de Flierdt, TinaauthorWelsh, KevinauthorYamane, MasakoauthorIODP Management International, College Station, TX, United StatespublisherdocumentDigitalPreliminary Report (Integrated Ocean Drilling Program)318101 pp.1932-9423Understanding the evolution and dynamics of the Antarctic cryosphere, from its inception during the Eocene-Oligocene transition ( approximately 34 Ma) through the significant subsequent periods of likely coupled climate and atmospheric CO (sub 2) changes, is not only of major scientific interest but also is of great importance for society. Drilling the Antarctic Wilkes Land margin was designed to provide a long-term record of the sedimentary archives along an inshore to offshore transect of Cenozoic Antarctic glaciation and its intimate relationships with global climatic and oceanographic change. The principal goals were 1. To obtain the timing and nature of the first arrival of ice at the Wilkes Land margin inferred to have occurred during the earliest Oligocene (reflecting Oligocene isotope Event 1), 2. To obtain the nature and age of the changes in the geometry of the progradational wedge interpreted to correspond with large fluctuations in the extent of the East Antarctic Ice Sheet and possibly coinciding with the transition from a wet-based to a cold-based glacial regime, 3. To obtain a high-resolution record of Antarctic climate variability during the late Neogene and Quaternary, and 4. To obtain an unprecedented ultrahigh resolution (i.e., annual to decadal) Holocene record of climate variability. The Wilkes Land drilling program was developed to constrain the age, nature, and paleoenvironment of deposition of the previously only seismically inferred glacial sequences. Drilling the Wilkes Land margin has a unique advantage in that seismic Unconformity WL-U3, inferred to separate preglacial strata below from glacial strata above in the continental shelf, can be traced to the continental rise deposits, allowing sequences to be linked from shelf to rise. Integrated Ocean Drilling Program Expedition 318, carried out in January-March 2010 (Wellington, New Zealand to Hobart, Australia), occupied seven sites that recovered approximately 2000 m of high-quality middle Eocene-Holocene sediments at proposed Sites WLRIS-6A, WLRIS-7A, WLRIS-4A, and WLRIS-5A (Sites U1355, U1356, U1359, and U1361) on the Wilkes Land rise and Sites WLSHE-8A, WLSHE-9A, and ADEL-01B (Sites U1358, U1360, and U1357) on the Wilkes Land shelf at water depths between approximately 400 and 4000 m. Together, the cores represent approximately 53 m.y. of Antarctic history. Recovered cores successfully date the inferred seismic units (WL-S4--WL-S9). The cores reveal the history of the Wilkes Land Antarctic margin from an ice-free "greenhouse Antarctica," to the first cooling, to the onset and erosional consequences of the first glaciation and the subsequent dynamics of the waxing and waning ice sheets, all the way to thick, unprecedented "tree ring style" records with seasonal resolution of the last deglaciation that began approximately 10,000 y ago. The cores also reveal details of the tectonic history of the so-called Australo-Antarctic Gulf (at 53 Ma) from the onset of the second phase of rifting between Australia and Antarctica, to ever subsiding margins and deepening, all the way to the present continental and ever widening ocean/continent configuration. Tectonic and climatic change turned the initially shallow broad subtropical Antarctic Wilkes Land shelf into a deeply subsided basin with a narrow, ice-infested margin. Thick Oligocene and notably Neogene deposits, including turbidites, contourites, and larger and smaller scaled debris mass flows witness the erosional power of the waxing and waning ice sheets and deep ocean currents. The recovered clays, silts, and sands and their microfossils also reveal the transition of subtropical ecosystems and a vegetated Antarctica into sea ice-dominated ecosystems bordered by calving glaciers.completedStratigraphyApplied geophysicsalgaeAntarctic ice sheetAntarcticabathymetrybiostratigraphyboreholescarbon dioxideCenozoicchemostratigraphychronostratigraphyclimate changecontinental margincontinental shelfcontouritecoresDeep Sea Drilling ProjectdiatomsDSDP Site 269East Antarctic ice sheetExpedition 318expeditionsForaminiferageophysical methodsgeophysical profilesgeophysical surveysglacial environmentglaciationinterglacial environmentInvertebrataIODP Site U1355IODP Site U1356IODP Site U1357IODP Site U1358IODP Site U1359IODP Site U1360IODP Site U1361Leg 28lithostratigraphymagnetostratigraphymarine sedimentsmicrofossilsnannofossilspaleo-oceanographypaleoclimatologypaleoenvironmentpaleotemperaturepalynomorphsPlantaeProtistaQuaternarysedimentsseismic methodsseismic profilesseismic stratigraphySouthern OceansurveysTertiaryturbiditeWilkes Landurn:org.iodp:exp:28urnlargerWorkCitationcampaignurn:org.iodp:exp:28:site:269urnlargerWorkCitationstudyurn:org.iodp:exp:28urnlargerWorkCitationcampaignEnglishgeoscientificInformation125.0000169.0000-75.000066.2500application/pdfunknownSEDIS Publication Catalogue

ana.macario@awi.de

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