georefid:2003-055054SEDIS 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=2003-0550542003-01-01publicationgeorefid:2003-055054Underwood, Michael B.University of Missouri, Department of Geological Sciences, Columbia, MO, United StatesauthorMoore, Gregory F.University of Hawaii, United StatesauthorTaira, AsahikoJapan Marine Science and Technology Center, JapanauthorKlaus, AdamTexas A&M University, United StatesauthorWilson, Moyra E. J.University of Durham, United KingdomauthorFergusson, Christopher L.University of Wollongong, AustraliaauthorHirano, SatoshiUniversity of Miami, United StatesauthorSteurer, JoanUniversitaet Bremen, Federal Republic of GermanyauthorBecker, KeirUniversity of Bristol, United KingdomauthorBecker, LuannWestern Washington University, United StatesauthorBoeckel, BabetteEcole Normale Superieure, FranceauthorCragg, BarryUniversity of Tokyo, JapanauthorDean, AllisonGeowissenschaftliche Gemeinschaftsaufgaben, Federal Republic of GermanyauthorHenry, PierreScripps Insitution of Oceanography, United StatesauthorHisamitsu, ToshioUniversity of Wales, United KingdomauthorHunze, SabineRice University, United StatesauthorKastner, MiriamHiroshima University, JapanauthorMaltman, AlexUniversity of Wyoming, United StatesauthorMorgan, JuliaUniversidad de Jaen, SpainauthorMurakami, YukiUniversity of Florida, United StatesauthorSaffer, DemianUniversity of Rhode Island, United StatesauthorSanchez-Gomez, MarioNew Mexico Institute of Mining and Technology, United StatesauthorScreaton, ElizabethNational Science Museum, JapanauthorSmith, DavidauthorSpivak, ArthurauthorTobin, HaroldauthorUjiie, KohtaroauthorSociety of Economic Paleontologists and Mineralogists, Tulsa, OK, United StatespublisherdocumentHardcopyJournal of Sedimentary Research73 (4)589-602Leg 190 of the Ocean Drilling Program yielded discoveries about the early stages of tectonic and sedimentary evolution of a trench-slope basin in the Nankai subduction zone of southwest Japan. Lithofacies character, biostratigraphy, and seismic-reflection data show that the basin's architecture was constructed during the early Quaternary by frontal offscraping of coarse-grained trench-wedge deposits. Clast types in muddy gravel beds indicate that one of the trench's polymictic sources was enriched in low-grade metasedimentary rocks. Outcrops of the Shimanto Belt on the island of Shikoku contain comparable lithologic assemblages, so we suggest that some of the turbidity currents and debris flows were funneled from that source through a transverse canyon-channel system. Offscraped trench deposits are mildly deformed and nearly flat lying beneath the slope basin. Bedding within the basin laps onto a hanging-wall anticline that formed above a major out-of-sequence thrust fault. Rapid uplift brought the substrate above the calcite compensation depth soon after the basin was created. The sediment delivery system probably was re-routed during subduction of the Kinan seamounts, thereby isolating the juvenile basin from coarse sediment influx. As a consequence, the upper 200 meters of basin fill consist of nannofossil-rich hemipelagic mud with sparse beds of volcanic ash and thin silty turbidites. Intervals of stratal disruption are also common, and the soft-sediment folding resulted from north- to northeast-directed gravitational failure. The Nankai accretionary prism has grown 40 km in width during the past 1 My, and the slope basin is already filled to its sill point on the sea-ward side. The stratigraphy displays an upward fining and thinning trend, in contrast to the upward coarsening and thickening mega-sequences depicted by some conceptual models for slope basins.completedOceanographySolid-earth geophysicsalgaeAsiabasinsbathymetrybiostratigraphyCenozoicchannelscontinental slopedebris flowsdeformationFar Eastfoldsgeophysical methodshemipelagic environmentJapanLeg 190lithofacieslithostratigraphymarine environmentmarine geologymass movementsmicrofossilsNankai TroughnannofossilsNorth PacificNorthwest PacificOcean Drilling Programocean floorsODP Site 1175ODP Site 1176Pacific Oceanphysical propertiesPlantaeplate tectonicsPleistoceneprovenanceQuaternaryreflection methodsseamountssedimentationsedimentsseismic methodsseismic stratigraphysequence stratigraphystratigraphic unitssubduction zonessubmarine canyonstrenchesturbiditeupliftsvolcanic ashWest Pacificurn:org.iodp:exp:190urnlargerWorkCitationcampaignurn:org.iodp:exp:190:site:1175urnlargerWorkCitationstudyurn:org.iodp:exp:190urnlargerWorkCitationcampaignurn:org.iodp:exp:190:site:1176urnlargerWorkCitationstudyurn:org.iodp:exp:190urnlargerWorkCitationcampaignEnglishgeoscientificInformation133.0000136.000031.300033.3000