Now showing items 3485-3504 of 8425

    • Hydrothermal activity along the slow-spreading Lucky Strike ridge segment (Mid-Atlantic Ridge) : distribution, heatflux, and geological controls 

      Escartin, Javier E.; Barreyre, Thibaut; Cannat, Mathilde; Garcia, Rafael; Gracias, Nuno; Deschamps, Anne; Salocchi, Aura; Sarradin, Pierre-Marie; Ballu, Valerie (2015-09)
      We have reviewed available visual information from the seafloor, and recently acquired microbathymetry for several traverses across the Lucky Strike segment, to evaluate the distribution of hydrothermal activity. We have ...
    • Hydrothermal activity on the ultra-slow spreading southern Knipovich Ridge 

      Connelly, Douglas P.; German, Christopher R.; Asada, Miho; Okino, K.; Egorov, A.; Naganuma, T.; Pimenov, N.; Cherkashev, G.; Tamaki, K. (American Geophysical Union, 2007-08-28)
      We report first evidence for hydrothermal activity from the southern Knipovich Ridge, an ultra-slow spreading ridge segment in the Norwegian-Greenland Sea. Evidence comes from optical backscatter anomalies collected during ...
    • The hydrothermal alteration of oceanic basalts by seawater 

      Humphris, Susan E. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1976-10)
      Considerable geological and geophysical evidence now exists to support the hypothesis that seawater circulates through freshly intruded basalt at the mid-ocean ridges. As a consequence of this process, reactions between ...
    • Hydrothermal circulation within the Endeavour Segment, Juan de Fuca Ridge 

      Johnson, H. Paul; Tivey, Maurice A.; Bjorklund, Tor A.; Salmi, Marie S. (American Geophysical Union, 2010-05-06)
      Areas of the seafloor at mid-ocean ridges where hydrothermal vents discharge are easily recognized by the dramatic biological, physical, and chemical processes that characterize such sites. Locations where seawater flows ...
    • Hydrothermal discharge during submarine eruptions : the importance of detection, response, and new technology 

      Baker, Edward T.; Chadwick, William W.; Cowen, James P.; Dziak, Robert P.; Rubin, Kenneth H.; Fornari, Daniel J. (The Oceanography Society, 2012-03)
      Submarine volcanic eruptions and intrusions construct new oceanic crust and build long chains of volcanic islands and vast submarine plateaus. Magmatic events are a primary agent for the transfer of heat, chemicals, and ...
    • Hydrothermal exploration of mid-ocean ridges : where might the largest sulfide deposits be forming? 

      German, Christopher R.; Petersen, Sven; Hannington, Mark D. (2015-11)
      Here, we review the relationship between the distribution of modern-day seafloor hydrothermal activity along the global mid-ocean ridge crest and the nature of the mineral deposits being formed at those sites. Since the ...
    • Hydrothermal exploration of the Fonualei Rift and Spreading Center and the Northeast Lau Spreading Center 

      German, Christopher R.; Resing, Joseph A.; Prien, R. D.; Walker, Sharon L.; Edmonds, Henrietta N.; Langmuir, Charles H. (American Geophysical Union, 2006-11-29)
      We report evidence for active hydrothermal venting along two back-arc spreading centers of the NE Lau Basin: the Fonualei Rift and Spreading Center (FRSC) and the Northeast Lau Spreading Center (NELSC). The ridge segments ...
    • Hydrothermal impacts on trace element and isotope ocean biogeochemistry 

      German, Christopher R.; Casciotti, Karen L.; Dutay, Jean-Claude; Heimburger, Lars-Eric; Jenkins, William J.; Measures, Christopher I.; Mills, Rachel A.; Obata, Hajime; Schlitzer, Reiner; Tagliabue, Alessandro; Turner, David R.; Whitby, Hannah (The Royal Society, 2016-10-17)
      Hydrothermal activity occurs in all ocean basins, releasing high concentrations of key trace elements and isotopes (TEIs) into the oceans. Importantly, the calculated rate of entrainment of the entire ocean volume through ...
    • Hydrothermal plume dynamics on Europa : implications for chaos formation 

      Goodman, Jason C.; Collins, Geoffrey C.; Marshall, John C.; Pierrehumbert, Raymond T. (American Geophysical Union, 2004-03-20)
      Hydrothermal plumes may be responsible for transmitting radiogenic or tidally generated heat from Europa's rocky interior through a liquid ocean to the base of its ice shell. This process has been implicated in the formation ...
    • Hydrothermal sediments as a potential record of seawater Nd isotope compositions : the Rainbow vent site (36°14′N, Mid-Atlantic Ridge) 

      Chavagnac, Valerie; Palmer, Martin R.; Milton, J. Andrew; Green, Darryl R. H.; German, Christopher R. (American Geophysical Union, 2006-09-09)
      Geochemical compositions and Sr and Nd isotopes were measured in two cores collected ~2 and 5 km from the Rainbow hydrothermal vent site on the Mid-Atlantic Ridge. Overall, the cores record enrichments in Fe and other ...
    • Hydrothermal vent fields and chemosynthetic biota on the world's deepest seafloor spreading centre 

      Connelly, Douglas P.; Copley, Jonathan T.; Murton, Bramley J.; Stansfield, Kate; Tyler, Paul A.; German, Christopher R.; Van Dover, Cindy L.; Amon, Diva; Furlong, Maaten; Grindlay, Nancy; Hayman, Nicholas W.; Huhnerbach, Veit; Judge, Maria; Le Bas, Tim; McPhail, Stephen; Meier, Alexandra; Nakamura, Ko-ichi; Nye, Verity; Pebody, Miles; Pedersen, Rolf B.; Plouviez, Sophie; Sands, Carla M.; Searle, Roger C.; Stevenson, Peter; Taws, Sarah; Wilcox, Sally (Nature Publishing Group, 2012-01-10)
      The Mid-Cayman spreading centre is an ultraslow-spreading ridge in the Caribbean Sea. Its extreme depth and geographic isolation from other mid-ocean ridges offer insights into the effects of pressure on hydrothermal ...
    • Hydrothermal vent mussel habitat chemistry, pre- and post-eruption at 9°50′North on the East Pacific Rise 

      Nees, Heather A.; Moore, Tommy S.; Mullaugh, Katherine M.; Holyoke, Rebecca R.; Janzen, Christopher P.; Ma, Shufen; Metzger, Edouard; Waite, Tim J.; Yucel, Mustafa; Lutz, Richard A.; Shank, Timothy M.; Vetriani, Costantino; Nuzzio, Donald B.; Luther, George W. (National Shellfisheries Association, 2008-03)
      Between October 2005 and March 2006, a seafloor volcanic eruption occurred at 9°50′N East Pacific Rise (EPR), establishing a “time zero” for characterizing newly-formed hydrothermal vent habitats and comparing them to ...
    • Hydrothermal venting at Vailulu'u Seamount : the smoking end of the Samoan chain 

      Staudigel, Hubert; Hart, Stanley R.; Koppers, Anthony A. P.; Constable, C.; Workman, Rhea K.; Kurz, Mark D.; Baker, Edward T. (American Geophysical Union, 2004-02-10)
      The summit crater of Vailulu'u Seamount, the youngest volcano in the Samoan chain, hosts an active hydrothermal system with profound impact on the ocean water column inside and around its crater (2 km wide and 407 m deep ...
    • Hydrothermal venting in magma deserts : the ultraslow-spreading Gakkel and Southwest Indian Ridges 

      Baker, Edward T.; Edmonds, Henrietta N.; Michael, Peter J.; Bach, Wolfgang; Dick, Henry J. B.; Snow, Jonathan E.; Walker, Sharon L.; Banerjee, Neil R.; Langmuir, Charles H. (American Geophysical Union, 2004-08-18)
      Detailed hydrothermal surveys over ridges with spreading rates of 50–150 mm/yr have found a linear relation between spreading rate and the spatial frequency of hydrothermal venting, but the validity of this relation at ...
    • Hydrothermally-induced melt lens cooling and segmentation along the axis of fast- and intermediate-spreading centers 

      Fontaine, Fabrice J.; Olive, Jean-Arthur L.; Cannat, Mathilde; Escartin, Javier E.; Perol, Thibaut (American Geophysical Union, 2011-07-28)
      The heat output and thermal regime of fast and intermediate spreading centers are strongly controlled by boundary layer processes between the hydrothermal system and the underlying crustal magma chamber (AMC), which remain ...
    • Hyperpolarization-activated currents and subthreshold resonance in granule cells of the olfactory bulb 

      Hu, Ruilong; Ferguson, Katie A.; Whiteus, Christina; Meijer, Dimphna H.; Araneda, Ricardo C. (Society for Neuroscience, 2016-10-27)
      An important contribution to neural circuit oscillatory dynamics is the ongoing activation and inactivation of hyperpolarization-activated currents (Ih). Network synchrony dynamics play an important role in the initial ...
    • Hyperspectral imaging of cuttlefish camouflage indicates good color match in the eyes of fish predators 

      Chiao, Chuan-Chin; Wickiser, J. Kenneth; Allen, Justine J.; Genter, Brock; Hanlon, Roger T. (2011-03-31)
      Camouflage is a widespread phenomenon throughout nature and an important anti-predator tactic in natural selection. Many visual predators have keen color perception, thus camouflage patterns should provide some degree ...
    • Hypertext: library applications. 

      Parker, Joan M. (IAMSLIC, 1990)
    • Hypotaurine and thiotaurine as indicators of sulfide exposure in bivalves and vestimentiferans from hydrothermal vents and cold seeps 

      Brand, Garth L.; Horak, Robin V.; Le Bris, Nadine; Goffredi, Shana K.; Carney, Susan L.; Govenar, Breea; Yancey, Paul H. (2006-08-24)
      Vesicomyid clams, vestimentiferans, and some bathymodiolin mussels from hydrothermal vents and cold seeps possess thiotrophic endosymbionts, high levels of hypotaurine and, in tissues with symbionts, thiotaurine. The latter, ...
    • I've been converted: alleluja! 

      Wiest, Natalie J. (IAMSLIC, 1995)