Now showing items 307-326 of 862

    • Genealogical analyses of multiple loci of litostomatean ciliates (Protista, Ciliophora, Litostomatea) 

      Vd'acny, Peter; Bourland, William A.; Orsi, William D.; Epstein, Slava S.; Foissner, Wilhelm (Elsevier, 2012-07-09)
      The class Litostomatea is a highly diverse ciliate taxon comprising hundreds of free-living and endocommensal species. However, their traditional morphology-based classification conflicts with 18S rRNA gene phylogenies ...
    • Generation of seafloor hydrothermal vent fluids and associated mineral deposits 

      Tivey, Margaret K. (Oceanography Society, 2007-03)
      In the nearly 30 years since the discovery of hydrothermal venting along open-ocean spreading centers, much has been learned about the generation of vent fluids and associated deposits. The hot, reducing, metal-rich, ...
    • Genesis of active sand-filled polygons in lower and central Beacon Valley, Antarctica 

      Bockheim, James G.; Kurz, Mark D.; Soule, Samuel A.; Burke, Andrea (2009-05)
      Nonsorted polygons with sand-filled wedges were investigated in lower and central Beacon Valley, Antarctica (77.82ºS, 160.67ºE) using field observations coupled with a 2-m resolution Digital Elevation Model and a ...
    • Geochemical and physical sources of radon variation in a subterranean estuary — implications for groundwater radon activities in submarine groundwater discharge studies 

      Dulaiova, Henrieta; Gonneea, Meagan E.; Henderson, Paul B.; Charette, Matthew A. (2007-12-13)
      Submarine groundwater discharge (SGD), in form of springs and diffuse seepage, has long been recognized as a source of chemical constituents to the coastal ocean. Because groundwater is two to four orders of magnitude ...
    • Geochemical cycling of silver in marine sediments along an offshore transect 

      Morford, Jennifer L.; Kalnejais, Linda H.; Helman, Peter; Yen, Gloria; Reinard, Melissa (2008-02-08)
      Although there have been many surface water and water column silver (Ag) analyses in the ocean, the absence of high resolution pore water and solid phase Ag profiles has hampered our understanding of its oceanic geochemical ...
    • Geochemical evidence (C, N and Pb isotopes) of recent anthropogenic impact in south-central Chile from two environmentally distinct lake sediment records 

      Fagel, Nathalie; Bertrand, Sebastien; Mattielli, Nadine; Gilson, Delphine; Chirinos, Luis; Lepoint, Gilles; Urrutia, Roberto (2009-10-29)
      In this paper, we compare the elemental and isotopic (C, N, Pb) geochemistry of lake sediments from two contrasted environments in South-Central Chile. The first lake, Laguna Chica de San Pedro (LCSP), is situated in the ...
    • Geochemical tracers of processes affecting the formation of seafloor hydrothermal fluids and deposits in the Manus back-arc basin 

      Craddock, Paul R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2009-02)
      Systematic differences in trace element compositions (rare earth element (REE), heavy metal, metalloid concentrations) of seafloor vent fluids and related deposits from hydrothermal systems in the Manus back–arc basin ...
    • Geochemistry of abyssal peridotites (Mid-Atlantic Ridge, 15°20′N, ODP Leg 209) : implications for fluid/rock interaction in slow spreading environments 

      Paulick, Holger; Bach, Wolfgang; Godard, M.; de Hoog, Jan C. M.; Suhr, G.; Harvey, Jason (2006-04-21)
      Abyssal peridotite from the 15°20’N area of the Mid-Atlantic Ridge show complex geochemical variations among the different sites drilled during ODP Leg 209. Major element compositions indicate variable degrees of melt ...
    • Geochemistry of deep-sea hydrothermal vent fluids from the Mid-Cayman Rise, Caribbean Sea 

      McDermott, Jill M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2015-02)
      This thesis examines the controls on organic, inorganic, and volatile species distributions in hydrothermal fluids venting at Von Damm and Piccard, two vent fields at the ultraslow spreading Mid-Cayman Rise, Earth’s deepest ...
    • Geochemistry of hydrothermal fluids from the PACMANUS, Northeast Pual and Vienna Woods hydrothermal fields, Manus Basin, Papua New Guinea 

      Reeves, Eoghan P.; Seewald, Jeffrey S.; Saccocia, Peter J.; Bach, Wolfgang; Craddock, Paul R.; Shanks, Wayne C.; Sylva, Sean P.; Walsh, Emily; Pichler, Thomas; Rosner, Martin (2010-10-29)
      Processes controlling the composition of seafloor hydrothermal fluids in silicic back-arc or neararc crustal settings remain poorly constrained despite growing evidence for extensive magmatichydrothermal activity in such ...
    • Geochemistry of hydrothermal vent fluids from the northern Juan de Fuca Ridge 

      Cruse, Anna M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2003-02)
      The presence of aqueous organic compounds derived from sedimentary organic matter has the potential to influence a range of chemical processes in hydrothermal vent environments. For example, hydrothermal alteration ...
    • Geochemistry of low-molecular weight hydrocarbons in hydrothermal fluids from Middle Valley, northern Juan de Fuca Ridge 

      Cruse, Anna M.; Seewald, Jeffrey S. (2006-01-10)
      Hydrothermal vent fluids from Middle Valley, a sediment-covered mid-ocean ridge on the northern Juan de Fuca Ridge, were sampled in July, 2000. Eight different vents with exit temperatures of 186 to 281°C were sampled from ...
    • Geochemistry of slow-growing corals : reconstructing sea surface temperature, salinity and the North Atlantic Oscillation 

      Goodkin, Nathalie F. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2007-06)
      A 225-year old coral from the south shore of Bermuda (64°W, 32°N) provides a record of decadal-to-centennial scale climate variability. The coral was collected live, and sub-annual density bands seen in x-radiographs ...
    • Geochemistry of surface sediments from the fjords of Northern Chilean Patagonia (44–47°S) : spatial variability and implications for paleoclimate reconstructions 

      Bertrand, Sebastien; Hughen, Konrad A.; Sepulveda, Julio; Pantoja, Silvio (2011-09-22)
      The Patagonian fjords have a clear potential to provide high-resolution sedimentary and geochemical records of past climate and environmental change in the Southern Andes. To improve our ability to interpret these proxy ...
    • Geology, geochemistry and earthquake history of Lṑihi Seamount, Hawaìi's youngest volcano 

      Garcia, Michael O.; Caplan-Auerbach, Jackie; De Carlo, Eric H.; Kurz, Mark D.; Becker, N. (2005-09-20)
      A half century of investigations are summarized here on the youngest Hawaiian volcano, Lō`ihi Seamount. It was discovered in 1952 following an earthquake swarm. Surveying in 1954 determined it has an elongate shape, which ...
    • Geomicrobiology of nitrogen in a coastal aquifer : isotopic and molecular methods to examine nitrification and denitrification in groundwater 

      Rogers, Daniel R. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2010-06)
      Excess nitrogen input is deleterious to coastal waters, resulting in deterioration of the water quality, increases in harmful algal blooms and disease in commercial fish stocks. A significant portion of this nitrogen ...
    • Geomicrobiology of the ocean crust : the phylogenetic diversity, abundance, and distribution of microbial communities inhabiting basalt and implications for rock alteration processes 

      Santelli, Cara M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2007-06)
      Basaltic ocean crust has the potential to host one of the largest endolithic communities on Earth. This portion of the biosphere, however, remains largely unexplored. In this study, we utilize molecular biological, ...
    • GEOTRACES IC1 (BATS) contamination-prone trace element isotopes Cd, Fe, Pb, Zn, Cu, and Mo intercalibration 

      Boyle, Edward A.; John, Seth G.; Abouchami, Wafa; Adkins, Jess F.; Echegoyen-Sanz, Yolanda; Ellwood, Michael J.; Flegal, A. Russell; Fornace, Kyrstin L.; Gallon, Celine; Galer, Steve; Gault-Ringold, Melanie; Lacan, Francois; Radic, Amandine; Rehkamper, Mark; Rouxel, Olivier J.; Sohrin, Yoshiki; Stirling, Claudine H.; Thompson, Claire; Vance, Derek; Xue, Zichen; Zhao, Ye (Association for the Sciences of Limnology and Oceanography, 2012-09)
      We report data on the isotopic composition of cadmium, copper, iron, lead, zinc, and molybdenum at the GEOTRACES IC1 BATS Atlantic intercalibration station. In general, the between lab and within-lab precisions are adequate ...
    • GEOTRACES intercalibration of 230Th, 232Th, 231Pa, and prospects for 10Be 

      Anderson, Robert F.; Fleisher, Martin Q.; Robinson, Laura F.; Edwards, R. Lawrence; Hoff, John A.; Moran, S. Bradley; Rutgers van der Loeff, Michiel M.; Thomas, Alexander L.; Roy-Barman, Matthieu; Francois, Roger (Association for the Sciences of Limnology and Oceanography, 2012-04)
      Nineteen labs representing nine nations participated in the GEOTRACES intercalibration initiative that determined concentrations of 232Th, 230Th, 231Pa, or 10Be in seawater, suspended particles or sediments. Results generally ...
    • The GEOTRACES Intermediate Data Product 2014 

      Mawji, Edward; Schlitzer, Reiner; Dodas, Elena Masferrer; Abadie, Cyril; Abouchami, Wafa; Anderson, Robert F.; Baars, Oliver; Bakker, Karel; Baskaran, Mark; Bates, Nicholas R.; Bluhm, Bluhm; Bowie, Andrew; Bown, Johann; Boye, Marie; Marie, Edward A.; Branellec, Pierre; Bruland, Kenneth W.; Brzezinski, Mark A.; Bucciarelli, Eva; Buesseler, Ken O.; Butler, Edward; Cai, Pinghe; Cardinal, Damien; Casciotti, Karen L.; Chaves, Joaquin; Cheng, Hai; Chever, Fanny; Church, Thomas M.; Colman, Albert S.; Conway, Tim M.; Croot, Peter L.; Cutter, Gregory A.; de Baar, Hein J. W.; de Souza, Gregory F.; Dehairs, Frank; Deng, Feifei; Dieu, Huong Thi; Dulaquais, Gabriel; Echegoyen-Sanz, Yolanda; Edwards, R. Lawrence; Fahrbach, Eberhard; Fitzsimmons, Jessica N.; Fleisher, Martin; Frank, Martin; Friedrich, Jana; Fripiat, Francois; Galer, Stephen J. G.; Gamo, Toshitaka; Garcia Solsona, Ester; Gerringa, Loes J. A.; Godoy, Jose Marcus; Gonzalez, Santiago; Grossteffan, Emilie; Hatta, Mariko; Hayes, Christopher T.; Heller, Maija Iris; Henderson, Gideon M.; Huang, Kuo-Fang; Jeandel, Catherine; Jenkins, William J.; John, Seth G.; Kenna, Timothy C.; Klunder, Maarten; Kretschmer, Sven; Kumamoto, Yuichiro; Laan, Patrick; Labatut, Marie; Lacan, Francois; Lam, Phoebe J.; Lannuzel, Delphine; le Moigne, Frederique; Lechtenfeld, Oliver J.; Lohan, Maeve C.; Lu, Yanbin; Masque, Pere; McClain, Charles R.; Measures, Christopher; Middag, Rob; Moffett, James; Navidad, Alicia; Nishioka, Jun; Noble, Abigail E.; Obata, Hajime; Ohnemus, Daniel C.; Owens, Stephanie A.; Planchon, Frederic; Pradoux, Catherine; Puigcorbe, Viena; Quay, Paul; Radic, Amandine; Rehkamper, Mark; Remenyi, Tomas; Rijkenberg, Micha J. A.; Rintoul, Stephen; Robinson, Laura F.; Roeske, Tobias; Rosenberg, Mark; Rutgers van der Loeff, Michiel; Ryabenko, Evgenia; Saito, Mak A.; Roshan, Saeed; Salt, Lesley; Sarthou, Geraldine; Schauer, Ursula; Scott, Peter M.; Sedwick, Peter N.; Sha, Lijuan; Shiller, Alan M.; Sigman, Daniel M.; Smethie, William; Smith, Geoffrey J.; Sohrin, Yoshiki; Speich, Sabrina; Stichel, Torben; Stutsman, Johnny; Swift, James H.; Tagliabue, Alessandro; Thomas, Alexander L.; Tsunogai, Urumu; Twining, Benjamin S.; van Aken, Hendrik M.; van Heuven, Steven; van Ooijen, Jan; van Weerlee, Evaline; Venchiarutti, Celia; Voelker, Antje H. L.; Wake, Bronwyn; Warner, Mark J.; Woodward, E. Malcolm S.; Wu, Jingfeng; Wyatt, Neil; Yoshikawa, Hisayuki; Zheng, Xin-Yuan; Xue, Zichen; Zieringer, Moritz; Zimmer, Louise A. (Elsevier, 2015-04-16)
      The GEOTRACES Intermediate Data Product 2014 (IDP2014) is the first publicly available data product of the international GEOTRACES programme, and contains data measured and quality controlled before the end of 2013. It ...