Results 201 to 210 of about 3,180 (229)

Geology of a vigorous hydrothermal system on the Endeavour Segment, Juan de Fuca Ridge

Journal of Geophysical Research: Solid Earth, 1992
A high‐precision, high‐resolution geologic map explicitly documents relationships between tectonic features and large steep‐sided, sulfide‐sulfate‐silica deposits in the vigorously venting Endeavour hydrothermal field near the northern end of the Juan de Fuca Ridge. Water depth in the vent field varies from 2220 to 2200 m.
John R. Delaney, Véronique Robigou, Russell E. McDuff, Margaret K. Tivey   +3 more
openaire   +1 more source

Along‐axis variations within the plate boundary zone of the southern segment of the Endeavour Ridge

Journal of Geophysical Research: Solid Earth, 1988
The width of and along‐axis variations within the plate boundary zone of the southern segment of the Endeavour Ridge of the Juan de Fuca Ridge System have been quantified using Sea MARC I side‐looking sonar imagery. The sonar imagery was calibrated with video and photographic surveying to provide visual corroboration of the activity, spacing, and ...
Angela M. Barone, William B. F. Ryan
openaire   +1 more source

Methane oxidation in deep-sea hydrothermal plumes of the endeavour segment of the Juan de Fuca Ridge

Deep Sea Research Part I: Oceanographic Research Papers, 1993
Methane oxidation rates were measured in samples from a deep-sea lateral hydrothermal plume generated from a vent field on the Endeavour Segment of the Juan de Fuca Ridge. Specific CH4 oxidation rates of up to 0.15 day−1, corresponding to turnover times on the order of 1 week, are the highest such rates so far reported for the water column of any ...
M.A. de Angelis, M.D. Lilley, J.A. Baross   +2 more
openaire   +1 more source

Heat flux from black smokers on the Endeavour and Cleft segments, Juan de Fuca Ridge

Journal of Geophysical Research: Solid Earth, 1994
We have estimated the heat flux from black smoker vents on the Juan de Fuca Ridge to evaluate their importance for heat transfer from young oceanic crust. The velocity and temperature of smoker effluent were measured from the manned submersible Alvin within a few centimeters of vent orifices, using a turbine flowmeter with an attached temperature probe.
Ursula Ginster, Michael J. Mottl, Richard P. Von Herzen   +2 more
openaire   +1 more source

Systematic Shift in Plume Bending Direction at Grotto Vent, Main Endeavour Field, Juan de Fuca Implies Systematic Change in Venting Output along the Endeavour Segment

2022
Analysis of the time-dependent behavior of the buoyant plume rising above Grotto Vent (Main Endeavour Field, Juan de Fuca Ridge) as imaged by the Cabled Observatory Vent Imaging Sonar (COVIS) between September 2010 and October of 2015 captures long-term time-dependent changes in the direction of background bottom currents independent of broader ...
Karen Bemis, Michael Zhao, Dax Soule
openaire   +1 more source

Geology and venting characteristics of the Mothra hydrothermal field, Endeavour segment, Juan de Fuca Ridge

Geology, 2001
The 500-m-long Mothra hydrothermal field is the largest venting site in areal extent on the Endeavour segment of the Juan de Fuca Ridge. Within this field, there are at least five actively venting sulfide complexes, spaced 40 to 200 m apart along a trend of 020.
Deborah S. Kelley, John R. Delaney, Dana R. Yoerger   +2 more
openaire   +1 more source

Geochemistry and morphology of metalliferous sediments and oxyhydroxides from the Endeavour segment, Juan de Fuca Ridge

Geochimica et Cosmochimica Acta, 2007
Abstract We present first data on the geochemistry, mineralogy and morphology of near-vent sediments (35 and 200 m from active vent) and ridge flank sediments (approximately 3 km from the vent field) as well as oxyhydroxide deposits from the Endeavour segment, Juan de Fuca Ridge.
Elitsa Hrischeva, Steven D. Scott
openaire   +1 more source

Lipid-rich ascending particles from the hydrothermal plume at Endeavour Segment, Juan de Fuca Ridge

Geochimica et Cosmochimica Acta, 2001
Abstract Samples of ascending and descending particulate matter from the hydrothermal plume at Endeavour Segment of the Juan de Fuca Ridge were analyzed for their lipid composition to investigate the biogeochemistry of particulate matter associated with oceanic hydrothermal processes.
Stuart G Wakeham, James P Cowen, Brenda J Burd, Richard E Thomson   +3 more
openaire   +1 more source

3D visualization of circulation and water properties at the endeavour segment of the Juan de Fuca mid-ocean ridge

2012 Oceans, 2012
The complex bathymetry and buoyancy fluxes associated with active spreading centres have a strong influence on the circulation and water properties in the region. The mixing of hot fluid (∼ 350 °C) emitted from hydrothermal vents with the surrounding sea water (∼ 2 °C) exerts control over circulation and transport of larvae, nutrients, microbes and ...
T. Beugeling, A. B. Albu, M. Hoeberechts, S. F. Mihaly   +3 more
openaire   +1 more source

228Th/228Ra ages of a barite-rich chimney from the Endeavour Segment of the Juan de Fuca Ridge

Earth and Planetary Science Letters, 1995
Ages in the range 1–15 yr for chimneys deposited from hydrothermal vents from the Endeavour Segment of the Juan de Fuca Ridge are estimated based on the ingrowth of228Th from228Ra. Cleaning samples by digestion in an acid bath confirms that the mineral barite is the phase being dated. A detailed examination of sample ALV 2463 R7 collected from the Clam
Aaron O. Reyes, Willard S. Moore, Debra S. Stakes   +2 more
openaire   +1 more source