Now showing items 21-40 of 996

  • Age and geochemistry of the mafic sills, ODP site 1276, Newfoundland margin 

    Hart, Stanley R.; Blusztajn, Jerzy S. (2006-07-03)
    Site 1276, Leg 210 of the Ocean Drilling Program, was located on the Newfoundland margin in seismically-defined ~128 Ma “transitional” crust just west of presumed oceanic crust, and the M3 magnetic anomaly. The goal of ...
  • Age and growth rate dynamics of an old African baobab determined by radiocarbon dating 

    Patrut, Adrian; Mayne, Diana H.; von Reden, Karl F.; Lowy, Daniel A.; Venter, Sarah; McNichol, Ann P.; Roberts, Mark L.; Margineanu, Dragos (Dept. of Geosciences, University of Arizona, 2010-08)
    In 2008, a large African baobab (Adansonia digitata L.) from Makulu Makete, South Africa, split vertically into 2 sections, revealing a large enclosed cavity. Several wood samples collected from the cavity were processed ...
  • Age systematics of two young en echelon Samoan volcanic trails 

    Koppers, Anthony A. P.; Russell, Jamie A.; Roberts, Jed; Jackson, Matthew G.; Konter, Jasper G.; Wright, Dawn J.; Staudigel, Hubert; Hart, Stanley R. (American Geophysical Union, 2011-07-29)
    The volcanic origin of the Samoan archipelago can be explained by one of three models, specifically, by a hot spot forming over a mantle plume, by lithospheric extension resulting from complex subduction tectonics in the ...
  • Ages and magnetic structures of the South China Sea constrained by deep tow magnetic surveys and IODP Expedition 349 

    Li, Chun-Feng; Xu, Xing; Lin, Jian; Sun, Zhen; Zhu, Jian; Yao, Yongjian; Zhao, Xixi; Liu, Qingsong; Kulhanek, Denise K.; Wang, Jian; Song, Taoran; Zhao, Junfeng; Qiu, Ning; Guan, Yongxian; Zhou, Zhiyuan; Williams, Trevor; Bao, Rui; Briais, Anne; Brown, Elizabeth A.; Chen, Yifeng; Clift, Peter D.; Colwell, Frederick S.; Dadd, Kelsie A.; Ding, Weiwei; Almeida, Ivan Hernandez; Huang, Xiao-Long; Hyun, Sangmin; Jiang, Tao; Koppers, Anthony A. P.; Li, Qianyu; Liu, Chuanlian; Liu, Zhifei; Nagai, Renata H.; Peleo-Alampay, Alyssa; Su, Xin; Tejada, Maria Luisa G.; Trinh, Hai Son; Yeh, Yi-Ching; Zhang, Chuanlun; Zhang, Fan; Zhang, Guo-Liang (John Wiley & Sons, 2014-12-27)
    Combined analyses of deep tow magnetic anomalies and International Ocean Discovery Program Expedition 349 cores show that initial seafloor spreading started around 33 Ma in the northeastern South China Sea (SCS), but varied ...
  • Airborne-radar and ice-core observations of annual snow accumulation over Thwaites Glacier, West Antarctica confirm the spatiotemporal variability of global and regional atmospheric models 

    Medley, Brooke; Joughin, Ian; Das, Sarah B.; Steig, Eric J.; Conway, Howard; Gogineni, S.; Criscitiello, Alison S.; McConnell, Joseph R.; Smith, B. E.; van den Broeke, Michiel R.; Lenaerts, Jan T. M.; Bromwich, D. H.; Nicolas, J. P. (John Wiley & Sons, 2013-07-26)
    We use an airborne-radar method, verified with ice-core accumulation records, to determine the spatiotemporal variations of snow accumulation over Thwaites Glacier, West Antarctica between 1980 and 2009. We also present a ...
  • Alteration of volcaniclastic deposits at Minna Bluff : geochemical insights on mineralizing environment and climate during the Late Miocene in Antarctica 

    Antibus, Joanne V.; Panter, Kurt S.; Wilch, Thomas I.; Dunbar, Nelia W.; McIntosh, William C.; Tripati, Aradhna K.; Bindeman, Ilya N.; Blusztajn, Jerzy S. (John Wiley & Sons, 2014-08-19)
    Secondary minerals in volcaniclastic deposits at Minna Bluff, a 45 km long peninsula in the Ross Sea, are used to infer processes of alteration and environmental conditions in the Late Miocene. Glassy volcaniclastic deposits ...
  • ALVIN dives on the continental margin off the southeastern United States, July 2-13, 1967 

    Millman, John D.; Manheim, Frank T.; Pratt, Richard M.; Zarudzki, E. F. K. (Woods Hole Oceanographic Institution, 1967-12)
    In late June and July, 1967, the Deep Submergence Research Vehicle (DSRV) ALVIN, aboard its mother snip, LULU, proceeded from the spring base of operations, Nassau, to its home port of Woods Hole. During this trip, from ...
  • Ambient noise analysis and finite difference modelling of VLF borehole seismic data 

    Stephen, Ralph A.; Swift, Stephen A.; Bolmer, S. Thompson (Woods Hole Oceanographic Institution, 1987-03)
    This report describes a preliminary analysis of borehole seismic data to determine VLF/Sub-bottom Seismic Noise in the Atlantic and the preliminary results of finite difference modelling for a Cape Fear environment. Noise ...
  • Amundsen Sea sea-ice variability, atmospheric circulation, and spatial variations in snow isotopic composition from new West Antarctic firn cores 

    Criscitiello, Alison S. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2014-02)
    Recent work has documented dramatic changes in the West Antarctic Ice Sheet (WAIS) over the past 30 years (e.g., mass loss, glacier acceleration, surface warming) due largely to the influence of the marine environment. ...
  • Anaerobic diagenesis of silica and carbon in continental margin sediments : discrete zones of TCO2 production 

    Berelson, William M.; Prokopenko, Maria; Sansone, F. J.; Graham, A. W.; McManus, Jerry F.; Bernhard, Joan M. (2005-05-10)
    Pore water profiles of dissolved Si, Ca2+, SO42-, CH4, and TCO2 (Dissolved Inorganic Carbon; DIC) were determined from multicores and gravity cores collected at nine sites off Southern California, the west coast of Mexico, ...
  • Analysis and modeling of hydrothermal plume data acquired from the 85°E segment of the Gakkel Ridge 

    Stranne, Christian; Sohn, Robert A.; Liljebladh, Bengt; Nakamura, Ko-ichi (American Geophysical Union, 2010-06-30)
    We use data from a CTD plume-mapping campaign conducted during the Arctic Gakkel Vents (AGAVE) expedition in 2007 to constrain the nature of hydrothermal processes on the Gakkel Ridge at 85°E. Thermal and redox potential ...
  • Analysis of Deep Seafloor Arrivals observed on NPAL04 

    Stephen, Ralph A.; Bolmer, S. Thompson; Udovydchenkov, Ilya A.; Dzieciuch, Matthew A.; Worcester, Peter F.; Andrew, Rex K.; Mercer, James A.; Colosi, John A.; Howe, Bruce M. (Woods Hole Oceanographic Institution, 2012-12)
    This report gives an overview of the analysis that was done on Deep Seafloor Arrivals since they were initially presented in Stephen et al (2009). All of the NPAL04/LOAPEX (North Pacific Acoustic Laboratory, 2004/ Long ...
  • Analysis of seafloor seismograms of the 2003 Tokachi-Oki earthquake sequence for earthquake early warning 

    McGuire, Jeffrey J.; Simons, Frederik J.; Collins, John A. (American Geophysical Union, 2008-07-31)
    Earthquake Early Warning (EEW) algorithms estimate the magnitude of an underway rupture from the first few seconds of the P-wave to allow hazard assessment and mitigation before the S-wave arrival. Many large subduction-zone ...
  • Analysis of stable sulfur isotopes and trace cobalt on sulfides from the TAG hydrothermal mound 

    Friedman, Carrie T. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1998-02)
    Stable sulfur isotopes (δ34S) and trace Co are analyzed in sulfide and sulfate minerals from six sample types collected from the TAG active mound, 26°N Mid-Atlantic Ridge. δ34S values range from 2.7 to 2O.9%, with sulfate ...
  • Anatomy of an active submarine volcano 

    Arnulf, Adrien F.; Harding, Alistair J.; Kent, Graham M.; Carbotte, Suzanne M.; Canales, J. Pablo; Nedimovic, Mladen R. (2014-05)
    Most of the magma erupted at mid-ocean ridges is stored in a mid-crustal melt lens that lies at the boundary between sheeted dikes and gabbros. Nevertheless, images of the magma pathways linking this melt lens to the ...
  • And on top of all that… coping with ocean acidification in the midst of many stressors 

    Breitburg, Denise L.; Salisbury, Joseph E.; Bernhard, Joan M.; Cai, Wei-Jun; Dupont, Sam; Doney, Scott C.; Kroeker, Kristy J.; Levin, Lisa A.; Long, W. Christopher; Milke, Lisa M.; Miller, Seth H.; Phelan, Beth; Passow, Uta; Seibel, Brad A.; Todgham, Anne E.; Tarrant, Ann M. (The Oceanography Society, 2015-06)
    Oceanic and coastal waters are acidifying due to processes dominated in the open ocean by increasing atmospheric CO2 and dominated in estuaries and some coastal waters by nutrient-fueled respiration. The patterns and ...
  • Anisotropy and the structural evolution of the oceanic upper mantle 

    Forsyth, Donald W. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1973-09)
    The dispersion of Love and Rayleigh waves in the period range 17-167 sec. is used to detect the change in the structure of the upper mantle as the age of the sea-floor increases away from the mid-ocean ridge. Using the ...
  • Anisotropy in seafloor flange, slab, and crust samples from measurements of permeability and porosity : implications for fluid flow and deposit evolution 

    Gribbin, Jill L.; Zhu, Wenlu; Tivey, Margaret K. (American Geophysical Union, 2012-03-21)
    Seafloor hydrothermal vents accommodate the convective transfer of fluids from subsurface environments to the oceans. In addition to black smoker chimneys, a variety of other deposit-types form. Flanges protrude from the ...
  • Anomalous porosity preservation and preferential accumulation of gas hydrate in the Andaman accretionary wedge, NGHP-01 site 17A 

    Rose, Kelly K.; Johnson, Joel E.; Torres, Marta E.; Hong, Wei-Li; Giosan, Liviu; Solomon, Evan A.; Kastner, Miriam; Cawthern, Thomas; Long, Philip E.; Schaef, H. Todd (Elsevier, 2014-06-06)
    In addition to well established properties that control the presence or absence of the hydrate stability zone, such as pressure, temperature, and salinity, additional parameters appear to influence the concentration of gas ...
  • Antarctic glacial chronology : new constraints from surface exposure dating 

    Ackert, Robert P. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2000-06)
    Surface exposure dating, using the concentration of cosmogenic nuclides (3He, 21Ne, and 36Cl) in moraine boulders, combined with mapping of glacial moraines from three key locations, is used to provide new constraints ...