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Dissertations / Theses on the topic 'Hydrothermal vents – Juan de Fuca Ridge'

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Published: 4 June 2021

Last updated: 8 February 2022

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1

Butterfield, David Allen. "Phase separation in submarine hydrothermal systems : evidence from the Juan de Fuca Ridge /." Thesis, Connect to this title online; UW restricted, 1990. http://hdl.handle.net/1773/10970.

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2

Tsurumi, Maia. "Ecology of hydrothermal vents on three segments of the Juan de Fuca Ridge, northeast Pacific." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ62531.pdf.

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3

Cruse, Anna M. (Anna Marie). "Geochemistry of hydrothermal vent fluids from the northern Juan De Fuca Ridge." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/39159.

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Thesis (Ph. D.)--Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, and the Woods Hole Oceanographic Institution), 2003.<br>Includes bibliographical references.<br>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 experiments indicate that alteration of organic-rich sediments leads to up to an order of magnitude more metals

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4

Arnoux, Gillean. "Novel Insights into Mass and Energy Transfer and Mid-Ocean Ridges from Seismic Imaging of the East Pacific Rise and Juan de Fuca Ridge." Thesis, University of Oregon, 2019. http://hdl.handle.net/1794/24532.

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In this dissertation, I use seismic imaging and waveform modeling methods to investigate melt migration processes and the structure of the magma plumbing system beneath the East Pacific Rise (EPR) and Endeavour segment of the Juan de Fuca Ridge, respectively. This work begins by studying shallow mantle reflections beneath the EPR. I find the amplitude versus offset and waveform characteristics of the reflections to be consistent with a sub-horizontal dunite channels located up to 20 km off-axis. The depth of the dunite channels correlate with patterns of mantle melt delivery and the predicted

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5

Grinar, Michele. "A CHARACTERIZATION OF A HYDROTHERMAL VENT COMMUNITY FROM A DIFFUSE FLOW VERTICAL WALL OF "THE TOWER" SULFIDE EDIFICE AT THE JUAN DE FUCA RIDGE." Master's thesis, Temple University Libraries, 2011. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/204453.

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Biology<br>M.S.<br>The Juan de Fuca Ridge, located 400 km off the coast of Washington State, is home to unstable and unpredictable hydrothermal vent sites where chemosynthetic communities flourish. In 2007 the manned submersible ALVIN retrieved a Ridgeia piscesae tubeworm community in its entirety from the side of the Tower sulfide edifice from the Endeavor segment of the Juan de Fuca Ridge (47 55.416720 N, 129 6.487020 W, at a depth of 2269 m) using the Bushmaster Jr. collection device. The collection was analyzed for community structure and the data collected were compared to that from sever

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6

Bemis, Karen G. "Geothermal heat flux from hydrothermal plumes on the Juan de Fuca Ridge." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13332.

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Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, and Woods Hole Oceanographic Institution, 1991.<br>GRSN 598250<br>Includes bibliographical references (p. 125-131).<br>by Karen G. Bemis.<br>M.S.

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7

Hunter, F. M. I. "Low-temperature hydrothermal fluid flow using geochemical tracers, Juan de Fuca Ridge flank, N.E. Pacific Ocean." Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604812.

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Fluid flow through mid-ocean ridge <i>axes</i> has long been recognised by geophysical and geochemical methods as well as direct observations. However, hydrothermal circulation through mid-ocean ridge <i>flanks</i> is more difficult to study and quantify due to the lower temperatures and less extreme fluid chemistry. In this thesis, a region of low-temperature fluid flow (up to 65°C), on the eastern flank of the Juan de Fuca Ridge, N.E. Pacific Ocean, has been investigated using isotopic and geochemical tracers. Pore water samples contained within sediment cores were collected at outcrops and

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8

Jonasson, Karina E. (Karina Elizabeth) Carleton University Dissertation Earth Sciences. "Benthic forminiferal distribution at Middle Valley, Juan de Fuca Ridge; a Northeast Pacific hydrothermal venting site." Ottawa, 1994.

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9

Marcus, Jean. "Community ecology of hydrothermal vents at Axial Volcano, Juan de Fuca Ridge, northeast Pacific." Thesis, 2003. https://dspace.library.uvic.ca//handle/1828/10341.

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Hydrothermal vents are deep-sea hot springs. Vents are home to luxuriant assemblages of animals that colonize the warm venting fluids. High biomass is fed by microbes that use hydrogen sulphide and other reduced chemicals in the vent fluid as an energy source to fix inorganic carbon. Individual vents may persist for a few years to several decades. The specialized animals must find new vents, cope with changing fluid conditions and foster their offspring. The composition and structure of vent communities vary in space and time. My research at Axial Volcano, a seamount on the Juan de Fuca

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10

Skebo, Kristina Michelle. "Distribution of zooplankton and nekton above hydrothermal vents on the Juan de Fuca and Explorer ridges." 2004. http://hdl.handle.net/1828/355.

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11

Channing, Catherine Erma. "Diffuse, low-temperature hydrothermal deposits on the Juan de Fuca ridge and plate." 2004. http://hdl.handle.net/1828/522.

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12

Bourbonnais, Annie. "Fixed nitrogen loss in two variably anoxic marine environments: the subsurface biosphere of hydrothermal vents (Juan de Fuca Ridge, northeast Pacific) and Saanich Inlet, a British Columbia fjord." Thesis, 2012. http://hdl.handle.net/1828/4323.

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We investigated oceanic dissolved inorganic nitrogen (N) dynamics, focussing on processes removing bio-available N and ultimately affecting primary productivity, in sulfidic hydrothermal vent fluids discharging from the subsurface on the Juan de Fuca Ridge (northeast Pacific Ocean) and in anoxic bottom waters of Saanich Inlet, a British Columbia fjord, using a combination of geochemical and molecular microbial ecology techniques. During episodes of mixing with oxygenated sea-water, both systems can switch from anoxic to oxic conditions. Strong inter-site variations in the concentrations and

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13

Puetz, Lara. "Connectivity within a metapopulation of the foundation species, Ridgeia piscesae Jones (Annelida, Siboglinidae), from the Endeavour Hydrothermal Vents Marine Protected Area on the Juan de Fuca Ridge." Thesis, 2014. http://hdl.handle.net/1828/5337.

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The natural instability of hydrothermal vents creates variable environmental conditions among habitat patches. Habitat differences correspond to phenotypic variation in Ridgeia piscesae, the only ‘vent tubeworm’ on the spreading ridges of the Northeast Pacific. Ridgeia piscesae that occupy high fluid flux habitats have rapid growth rates and high reproductive output compared to tubeworms in habitats with low rates of venting fluid delivery. As recruitment occurs in all settings, worms in the “optimal habitat” may act as source populations for all habitat types. Ridgeia piscesae is a foundation

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14

Forget, Nathalie. "Free-Living and Symbiotic Bacterial Communities in Contrasting Hydrothermally Active Habitats." Thesis, 2013. http://hdl.handle.net/1828/4869.

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Prokaryotic microorganisms, which are at the base of deep-sea hydrothermal vent food webs, adapt rapidly to environmental fluctuations. This study aimed at comparing bacterial communities in contrasting hydrothermal habitats to better understand compositional adaptations to local conditions. I first used small subunit (SSU) ribosomal RNA (rRNA) gene sequences to compare mat-forming bacterial communities associated with iron oxides at two hydrothermal vent sites on the Tonga Arc, southwest Pacific. Operational taxonomic units (OTUs), defined at 97% sequence similarity, were affiliated to a grea

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15

Bates, Amanda Elizabeth. "Population and feeding characteristics of hydrothermal vent gastropods along environmental gradients with a focus on bacterial symbiosis hosted by Lepetodrilus fucensis (Vetigastropoda)." Thesis, 2006. http://hdl.handle.net/1828/1859.

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Three gastropods occupy a range of habitats along gradients in hydrothermal flux at Juan de Fuca Ridge vents. I examined how these species co-exist and identified mechanisms driving their abundances. First, I measured temperatures and spatial patterns in adult densities of the three species at three distances from vents to test if thermal regime relates to their habitat selection. Lepetodrilus fucensis and Depressigyra globulus were most dense in-vent (0-25 cm) at variable temperatures (10+5°C): 2100 and 240 incl. dm -2 (respectively). Provanna variabilis was most abundant far-vent (51-75 cm:

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16

Lelièvre, Yann. "Structure et dynamique temporelle des communautés hydrothermales inféodées à la dorsale Juan de Fuca : utilisation d’une approche observatoire fond de mer." Thèse, 2017. http://hdl.handle.net/1866/20779.

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17

St, Germain Candice. "Reproductive and physiological condition and juvenile recruitment in the hydrothermal vent tubeworm Ridgeia piscesae Jones (Polychaeta: Siboglinidae) in the context of a highly variable habitat on Juan de Fuca Ridge." Thesis, 2011. http://hdl.handle.net/1828/3787.

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The hydrothermal vent environment, in its extreme spatial and temporal variability, offers the opportunity to study habitats that are naturally fragmented and unstable. The vestimentiferan tubeworm Ridgeia piscesae is a foundation species inhabiting hydrothermal vent habitat in the Northeast Pacific Ocean. R. piscesae is a phenotypically plastic species and is arranged in a metapopulation spatial structure, with each local population displaying one of a range of morphotypes. Ridgeia piscesae participates in an obligate symbiosis that is dependent on hydrogen sulphide in the hydrothermal vent f

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18

Attar, Armaghan. "Geochemistry of hydrothermal sediments from the Endeavour Segment of the Juan de Fuca mid-ocean ridge." Thesis, 2016. http://hdl.handle.net/1828/7334.

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Sediment samples were collected during three Ocean Network Canada expeditions to three hydrothermal vent fields at the Endeavour segment of the Juan de Fuca Ridge. The sediments were collected at variable distances (≤ 1340 m) from the vents fields by push core and, in some cases, by suction sampling from base of a chimney structure. The geochemistry of the sediments was investigated in order to understand their formation and the mass fluxes associated with these hydrothermal systems. Qualitative and quantitative approaches have been applied to deconvolve sediments bulk compositions into mass f

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