georefid:2006-087306SEDIS 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=2006-0873062004-01-01publicationgeorefid:2006-087306Marsaglia, Kathleen M.California State University at Northridge, Northridge, CA, United StatesauthorArnaboldi, MichelaUniversity of Michigan, Department of Geological Sciences, United StatesauthorHiscott, Richard N.Memorial University of Newfoundland, Earth Sciences Department, CanadaauthorPletsch, Thomas K.Bundesanstalt fur Geowissenschaften und Rohstoffe, Technical Mineralogy and Sedimentology Section, Federal Republic of GermanyauthorRobertson, AlastairUniversity of Edinburgh, Department of Geology and Geophysics, United KingdomauthorShirai, MasaakiUniversity of Tokyo, Ocean Research Institute, JapanauthorWilson, Richard C.Open University Milton Keynes, Department of Earth Sciences, United KingdomauthorEngstrom, AnnaStockholm Universitet, Department of Geology and Geochemistry, SwedenauthorManatschal, GianretoEcole et Observatoire des Sciences de le Terre, Centre de Geochimie de la Surface, FranceauthorShryane, ThereseNational University of Ireland, Galway Geofluids Research Centre, IrelandauthorLeckie, R. MarkUniversity of Massachusetts, Department of Geosciences, United StatesauthorAmerican Association of Petroleum Geologists and Society for Sedimentary Geology, Tulsa, OK, United StatespublisherdocumentHardcopyIn: Anonymous, AAPG annual meeting1392Ocean Drilling Program (ODP) Site 1276 was drilled in 4549 meters water depth in the Newfoundland Basin approximately 360 km east of Hibernia Field, off Canada. It records the post-rift burial of irregular basement topography. Below a cased, uncored depth of 800 meters, 933 m of lower Oligocene to uppermost Aptian(?)-lower Albian sedimentary rocks were cored ( approximately 85% recovery). Drilling terminated in diabase sills coincident with a prominent seismic reflector (U) previously hypothesized to correlate with the Avalon Unconformity. The stratigraphy at Site 1276 is similar to that drilled on the conjugate Iberian margin. Background hemipelagic mudrocks and interbedded coarser gravity-flow deposits form the bulk of the succession at Site 1276. They include debris flows, turbidites, and muddy viscous gravity-flow deposits that range in composition from siliciclastic sandstones and mudrocks to carbonate grainstones and marlstones. Most gravity-flow deposits contain significant biogenic carbonate, whereas most of the interbedded hemipelagic sediments are non-calcareous, reflecting deposition below the carbonate compensation depth. The Albian-Cenomanian section is characterized by moderately enriched total organic carbon (TOC) content (max. of approximately 10% TOC), low hydrogen indices (HI < 100), C/N ratios averaging approximately 20, and a positive correlation between C/N and TOC, suggesting a strong influence of terrestrially derived organic matter. Finely laminated, discrete organic-rich "black shales" with higher TOC are present. Two such intervals may correspond with Oceanic Anoxic Events 1b and 2; they have HI > 150, characteristic of marine organic matter and have S (sub 2) up to 25 mgHC/g, indicating that they originally had petroleum-generating potential.completedEconomic geology, geology of energy sourcesanaerobic environmentAtlantic Oceanblack shalecarbonclastic rocksdeep-water environmentdrillinggenesishemipelagic environmentHibernia FieldhydrogenintrusionslaminationsLeg 210marine environmentmudstoneNewfoundland BasinnitrogenNorth AtlanticNorthwest AtlanticOcean Drilling ProgramODP Site 1276oil and gas fieldsorganic compoundspetroleumplanar bedding structuressandstonesedimentary rockssedimentary structuressillstotal organic carbonurn:org.iodp:exp:210urnlargerWorkCitationcampaignurn:org.iodp:exp:210:site:1276urnlargerWorkCitationstudyurn:org.iodp:exp:210urnlargerWorkCitationcampaignEnglishgeoscientificInformation-80.000020.00000.000075.0000North Atlantic