Results 11 to 20 of about 6,578 (212)

Mid‐Ocean Ridge (MOR) Ash Dispersal on Axial Seamount, Juan de Fuca Ridge

Geochemistry, Geophysics, Geosystems
Rare eruption of primitive normal mid‐ocean ridge basalt (N‐MORB) magma (∼9.5 wt% MgO) on the summit of Axial Seamount generated abundant ash that was dispersed for several km.
Ryan A. Portner, Guangyu Xu, Arran P. Murch, David A. Clague, Brian M. Dreyer, Jennifer B. Paduan   +5 more
doaj   +3 more sources

Phylogenetic diversity of microorganisms in subseafloor crustal fluids from boreholes 1025C and 1026B along the Juan de Fuca Ridge flank [PDF]

Frontiers in Microbiology, 2014
To expand investigations into the phylogenetic diversity of microorganisms inhabiting the subseafloor biosphere, basalt-hosted crustal fluids were sampled from Circulation Obviation Retrofit Kits affixed to Holes 1025C and 1026B along the Juan de Fuca ...
Sean eJungbluth, Sean eJungbluth, Huei-Ting eLin, James eCowen, Brian T. Glazer, Michael eRappe   +5 more
doaj   +2 more sources

Upper crustal evolution across the Juan de Fuca ridge flanks [PDF]

Geochemistry, Geophysics, Geosystems, 2008
Recent P wave velocity compilations of the oceanic crust indicate that the velocity of the uppermost layer 2A doubles or reaches ∼4.3 km/s found in mature crust in <10 Ma after crustal formation. This velocity change is commonly attributed to precipitation of low‐temperature alteration minerals within the extrusive rocks associated with ridge‐flank ...
Nedimovic, Mladen R., Carbotte, Suzanne M., Diebold, John B., Harding, Alistair J., Canales, J. Pablo, Kent, Graham M.   +5 more
openaire   +4 more sources

Anaerobic oxidation of short-chain alkanes in hydrothermal sediments: potential influences on sulfur cycling and microbial diversity [PDF]

Frontiers in Microbiology, 2013
Short-chain alkanes play a substantial role in carbon and sulfur cycling at hydrocarbon-rich environments globally, yet few studies have examined the metabolism of ethane (C2), propane (C3), and butane (C4) in anoxic sediments in contrast to methane (C1).
Melissa M Adams, Adrienne L Hoarfrost, Arpita eBose, Samantha B Joye, Peter R Girguis   +4 more
doaj   +5 more sources

Osmium isotopes in hydrothermal fluids from the Juan de Fuca Ridge [PDF]

Earth and Planetary Science Letters, 2000
We present Os data for axial high-temperature and off-axial low-temperature hydrothermal solutions from the Juan de Fuca Ridge. The high-temperature, H₂S-bearing axial fluids have unradiogenic Os isotopes pointing to a nearly complete domination of osmium isotopes from the basalts during hydrothermal circulation.
Sharma, M., Wasserburg, G. J., Hofmann, A. W., Butterfield, D. A.   +3 more
openaire   +5 more sources

Voluminous Inflated Lobate Flows on the Distal Rift Zones of Axial Seamount, Juan de Fuca Spreading Ridge

Geochemistry, Geophysics, Geosystems
Three voluminous inflated lobate lava flow complexes on the distal rifts of Axial Seamount are much larger than other known flows in the global spreading system.
Jennifer B. Paduan, David A. Clague, David W. Caress, Ryan Portner, Morgane Le Saout, Brian Dreyer   +5 more
doaj   +2 more sources

Asymmetric seafloor depth across the Juan de Fuca Ridge caused by lithospheric heating

Communications Earth & Environment, 2023
Previous studies attribute asymmetries across the East Pacific Rise to horizontal temperature or pressure gradients in the deep asthenosphere caused by the Pacific Superswell, which, however, cannot explain asymmetries observed across the Juan de Fuca ...
Mengyu Wu, Michael H. Ritzwoller
doaj   +1 more source

Dispersion of deep-sea hydrothermal plumes at the Endeavour Segment of the Juan de Fuca Ridge: a multiscale numerical study

Frontiers in Marine Science, 2023
A multiscale numerical framework has been developed to investigate the dispersion of deep-sea hydrothermal plumes that originate from the Endeavour Segment of the Juan de Fuca Ridge located in the Northeast Pacific.
Guangyu Xu, Christopher R. German
doaj   +1 more source

Chemical alteration of sediments on early stage of existing of hydrothermal systems in spreading zones of sedimented ridges (hydrothermal field “Dead Dog”, Middle Valley, Juan de Fuca Ridge) [PDF]

E3S Web of Conferences, 2019
In sediments from Holes DSDP 858B, D, F, located near the active hot vent on the thermal field “Dead Dog” in the northern part of the Juan de Fuca Ridge, Middle Valley, a redistribution of chemical elements occurs as a result of solution-rock interaction.
Khakhina Alexandra, Kurnosov Victor, Konovalov Yurii, Churkina Valeriya, Galin Konstantin   +4 more
doaj   +1 more source

Systematic shift in plume bending direction at Grotto Vent, Main Endeavour Field, Juan de Fuca Ridge implies changes in venting output along the Endeavour Segment

Frontiers in Earth Science, 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 ...
Karen G. Bemis, Michael Zhao, Joshua Sacker, Dax C. Soule, Dax C. Soule   +4 more
doaj   +1 more source