georefid:2012-016488SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2013-07-08T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.2204/iodp.pr.336.20122011-01-01publicationgeorefid:2012-016488issn:1932-9423doi:10.2204/iodp.pr.336.2012Edwards, Katrina J.University of Southern California, Department of Biological Sciences, Los Angeles, CA, United StatesauthorBach, WolfgangUniversity of Bremen, GermanyauthorKlaus, AdamIntegrated Ocean Drilling Program, United StatesauthorAnderson, LouiseUniversity of Leicester, United KingdomauthorBackert, NicolasUniversite des Sciences et Technologies de Lille 1, FranceauthorBecker, KeirRosenstiel School of Marine and Atmospheric Science, United StatesauthorGriffin, Dale W.U. S. Geological Survey, United StatesauthorHaddad, Amanda G.AIST, Geological Survey of Japan, JapanauthorHarigane, YumikoJapan Agency for Marine-Earth Science and Technology, JapanauthorHirayama, HisakoMoss Landing Marine Laboratories, United StatesauthorHulme, Samuel M.Universitetet i Bergen, NorwayauthorJorgensen, Steffen LethUniversity of Rhode Island, United StatesauthorLado Insua, TaniaInstitut de Physique du Globe de Paris, FranceauthorLe Campion, PaulAarhus University, DenmarkauthorMills, Heath J.Korea Institute of Geosicence and Mineral Resources, South KoreaauthorNakamura, KentaroUniversity of Cambridge, United KingdomauthorOrcutt, BethIFREMER, FranceauthorPark, Young-SooUniversity of Delaware, United StatesauthorRennie, VictoriaOsaka University, JapanauthorRouxel, OlivierCalifornia Institute of Technology, United StatesauthorRussel, Joseph A.Shanghai Jiao Tong University, ChinaauthorSakata, KasumiUniversity of Alaska-Fairbanks, United StatesauthorSalas, Everett C.authorWang FengpingauthorWheat, C. GeoffreyauthorIODP Management International, College Station, TX, United StatespublisherdocumentDigitalPreliminary Report (Integrated Ocean Drilling Program)33672 pp.1932-9423Integrated Ocean Drilling Program (IODP) Expedition 336 successfully initiated subseafloor observatory science at a young mid-ocean-ridge flank setting. All of the drilled sites are located in the North Pond region of the Atlantic Ocean (22 degrees 45'N, 46 degrees 05'W) in 4414-4483 m water depth. This area is known from previous ocean drilling and site survey investigations as a site of particularly vigorous circulation of seawater in permeable 8 Ma basaltic basement underlying a <300 m thick sedimentary pile. Understanding how this seawater circulation affects microbial and geochemical processes in the uppermost basement was the primary science objective of Expedition 336. Basement was cored and wireline-logged in Holes U1382A and U1383C. Upper oceanic crust in Hole U1382A, which is only 50 m west of Deep Sea Drilling Project (DSDP) Hole 395A, recovered 32 m of core between 110 and 210 meters below seafloor (mbsf). Core recovery in basement was 32%, yielding a number of volcanic flow units with distinct geochemical and petrographic characteristics. A unit of sedimentary breccia containing clasts of basalt, gabbroic rocks, and mantle peridotite was found intercalated between two volcanic flow units and was interpreted as a rock slide deposit. From Hole U1383C we recovered 50.3 m of core between 69.5 and 331.5 mbsf (19%). The basalts are aphyric to highly plagioclase-olivine-phyric tholeiites that fall on a liquid line of descent controlled by olivine fractionation. They are fresh to moderately altered, with clay minerals (saponite, nontronite, and celadonite), Fe oxyhydroxide, carbonate, and zeolite as secondary phases replacing glass and olivine to variable extents. In addition to traditional downhole logs, we also used a new logging tool for detecting in situ microbial life in ocean floor boreholes--the Deep Exploration Biosphere Investigative tool (DEBI-t). Sediment thickness was approximately 90 m at Sites U1382 and U1384 and varied between 38 and 53 m at Site U1383. The sediments are predominantly nannofossil ooze with layers of coarse foraminiferal sand and occasional pebble-size clasts of basalt, serpentinite, gabbroic rocks, and bivalve debris. The bottommost meters of sections cored with the advanced piston corer feature brown clay. Extended core barrel coring at the sediment/basement interface recovered <1 m of brecciated basalt with micritic limestone. Sediments were intensely sampled for geochemical pore water analyses and microbiological work. In addition, high-resolution measurements of dissolved oxygen concentration were performed on the whole-round sediment cores.completedOceanographyalterationaquifersAtlantic Oceanbasaltsbasementbiogenic processesboreholescommunitiescorescrustDSDP Site 395ecologygeochemistrygeomicrobiologyground waterigneous rocksIODP Site U1382IODP Site U1383IODP Site U1384marine sedimentsmicroorganismsMid-Atlantic RidgeNorth AtlanticNorth PondOcean Drilling Programoceanic crustphysical propertiessedimentary rockssedimentsvolcanic rockswater-rock interactionwell logsurn:org.iodp:exp:45:site:395urnlargerWorkCitationstudyurn:org.iodp:exp:45urnlargerWorkCitationcampaignurn:org.iodp:exp:78:site:395urnlargerWorkCitationstudyurn:org.iodp:exp:78urnlargerWorkCitationcampaignurn:org.iodp:exp:336:site:395urnlargerWorkCitationstudyurn:org.iodp:exp:336urnlargerWorkCitationcampaignurn:org.iodp:exp:336:site:U1382urnlargerWorkCitationstudyurn:org.iodp:exp:336urnlargerWorkCitationcampaignurn:org.iodp:exp:336:site:U1383urnlargerWorkCitationstudyurn:org.iodp:exp:336urnlargerWorkCitationcampaignurn:org.iodp:exp:336:site:U1384urnlargerWorkCitationstudyurn:org.iodp:exp:336urnlargerWorkCitationcampaignEnglishgeoscientificInformation-46.4553-46.031022.452122.4842application/pdfunknownSEDIS Publication Catalogue

ana.macario@awi.de

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