georefid:1976-016984SEDIS 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=10.2973/dsdp.proc.29.131.19751975-01-01publicationgeorefid:1976-016984doi:10.2973/dsdp.proc.29.131.1975Andrews, P. B.U. S. Geol. Surv., Menlo Park, Calif., United StatesauthorOvenshine, A. T.authorTexas A & M University, Ocean Drilling Program, College Station, TX, United StatespublisherdocumentDigitalInitial Reports of the Deep Sea Drilling Project29 (Lyttleton, N. Z. to Wellington, N. Z.; March-April 1973)1049-1063A terrigenous silt and clay facies has been shown to be the first sediment to accumulate on basement (both oceanic and continental) at many sites drilled during Leg 29, and at many DSDP sites in the Indian Ocean and Tasman Sea drilled during earlier legs. It is divided into two subfacies: a burrow-mottled subfacies which predominates and a bedded subfacies which is rare. The burrow mottled subfacies is dark olive-gray to dark brown, burrow mottled, organic-rich, pyrite, glauconite, and micronodul-bearing. It is a poorly sorted, clayey silt to clay, composed of land-derived detritus, and is characterized by a very restricted flora and fauna, the latter being dominated by siliceous, and agglutinating benthonic foraminifera. The upper third of the subfacies is silicified wherever the overlying sediments are rich in siliceous microfossils. It is inferred that the subfacies accumulated where bottom waters were oxygenated, but circulation was sluggish. It is further inferred that the subfacies accumulated during the early sea-floor-spreading phase in the evolution of the respective ocean basins. The bedded subfacies forms units that alternate with the burrow mottled subfacies at one site. It consists of slightly graded beds clayey silt. The microfossils are shallow-water benthonic foraminifera and neritic nannofossils. Graded beds are interpreted as turbidites.completedOceanographyaccumulationbiogenic structuresbioturbationCenozoicclastic sedimentsclasticsclayCretaceousDeep Sea Drilling Projectenvironmental analysisevolutiongenesisLeg 29lithofacieslithostratigraphymarine geologyMesozoicmineral compositionocean basinsPacific Oceanprovenancesea-floor spreadingsedimentary structuressedimentationsedimentssequencesiltsortingSouth PacificsouthwestSouthwest PacificstratigraphyTasman SeaterrigenousTertiaryWest Pacificurn:org.iodp:exp:29urnlargerWorkCitationcampaignEnglishgeoscientificInformation143.0000177.0000-57.0000-30.0000Tasman Seaapplication/pdfunknownSEDIS Publication Catalogue

ana.macario@awi.de

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