georefid:2011-072606SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2013-07-08T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=2011-072606Interplay of mass-transport and turbidite-system deposits in different active tectonic and passive continental margin settings; external and local controlling factors2011-01-01publicationgeorefid:2011-072606
Nelson, C. HansUniversidad de Granada, Instituto Andaluz de Ciencias de la Tierra, Granada, SpainauthorEscutia, CarlotaUniversity of Colorado at Boulder, United StatesauthorDamuth, John E.Chevron Energy Technology, United StatesauthorTwichell, David C., Jr.University of Texas at Arlington, United StatesauthorSociety for Sedimentary Geology (SEPM), Tulsa, OK, United StatespublisherdocumentHardcopyIn: Shipp, R. Craig (editor), Weimer, Paul (editor), Posamentier, Henry W. (editor), Mass transport deposits in deep-water settings9639-66The volume and interplay of mass-transport (MTD) and turbidite-system deposits varies on different continental margins depending on local and external controls such as active-margin or passive-margin tectonic setting and climatic and/or sea-level change. Erosion and breaching of local grabens at the shelf edge of the southern Bering Sea produce giant, gullied canyons and MTD sheets that dominate the basin-floor deposition and disrupt development of turbidite systems. In contrast, external controls of great earthquakes (> 8 Mw) along the Pacific active tectonic continental margins of Cascadia and northern California cause seismic strengthening of the sediment, which results in minor MTDs compared to turbidite-system deposits. Messinian desiccation of the Mediterranean Sea caused a deeply eroded Ebro subaerial canyon and an unstable central segment with an MTD sheet, whereas other stable Ebro margin segments have only turbidite systems. In the northern Gulf of Mexico, the delta-fed Mississippi Fan and intraslope mini-basins contain MTDs and turbidites that are equally intermixed from the largest scales with MTD sheets hundreds of kilometers long to the smallest scales with beds centimeters thick. In the Antarctic Wilkes Land margin, global climate cooling caused a late Oligocene to middle Miocene time of temperate continental ice sheets that resulted in massive deposition of MTDs on the margin, whereas later polar ice sheets favored development of turbidite systems. Our case studies provide the following new insights: (1) MTDs can dominate entire margins, dominate segments of a margin, be equally mixed with turbidites, or dominate a margin during some geologic times and not others; (2) on active tectonic margins with great earthquakes, the maximum run-out distances of MTD sheets across abyssal-basin floors are an order of magnitude less ( approximately 100 km) than on passive-margin settings ( approximately 1000 km), and the volumes of MTDs are limited on the abyssal sea floor along active margins; (3) where the most precise radiocarbon ages are available, major MTD episodes of deposition are correlated with the most rapid falls or rises of sea level; (4) gullied canyons feeding MTD sheets have irregular and steep axial gradients (5-9 degrees ), whereas canyons feeding turbidite systems have a regular graded profile and less steep gradients (1 to 5 degrees ). Our examples of MTD and turbidite systems provide analogues to help interpret ancient systems.completedSedimentary petrologyStructural geologyabyssal plainsAmazon FanAntarcticaAtlantic Oceanbasin analysisBering SeaCaliforniaCascadia BasinCenozoicclastic rocksclastic sedimentscontinental margincontinental margin sedimentationdeep-water environmentdepositiondepositional environmentearthquakesEast PacificEbro BasinEquatorial AtlanticEuropegeophysical methodsgeophysical surveysGulf of MexicoIberian PeninsulaLeg 155marine environmentmarine sedimentationmass movementsMississippi DeltaMississippi EmbaymentneotectonicsNorth AtlanticNorth PacificNortheast PacificOcean Drilling Programocean floorsODP Site 936ODP Site 941offshorePacific Oceanpaleoclimatologypaleoenvironmentpassive marginspetroleumpetroleum explorationplate tectonicssediment transportsedimentary rockssedimentationsedimentologysedimentsseismic methodsseismic stratigraphySouthern EuropeSpainsubmarine canyonssubmarine fanssurveystectonicsTertiarytransportturbiditeUnited StatesWilkes Landurn:org.iodp:exp:155
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urnlargerWorkCitationcampaignEnglishgeoscientificInformation-86.0000-47.44085.221527.0000