Results 81 to 90 of about 61,741,193 (165)

Sr isotopic variations along the Juan de Fuca Ridge [PDF]

, 1984
Sr isotopic ratios of 39 glass and microcrystalline basalt samples along the Juan de Fuca Ridge and 1 glass sample from Brown Bear Seamount are at the lower end of the range for normal mid‐oceanic ridge basalt (MORB); the average 87Sr/86Sr ratio is 0 ...
Jacqueline Eaby, John R. Delaney, Clague, David A., Delaney, John R., Eaby, Jacqueline, David A. Clague   +5 more
core   +1 more source

Low-Temperature Hydrothermal Plumes in the Near-Bottom Boundary Layer at Endeavour Segment, Juan de Fuca Ridge [PDF]

Oceanography, 2012
Low-temperature (typically 5–75°C) fluid, commonly referred to as "diffuse" hydrothermal flow, emanates from fractures over a significant portion of the Juan de Fuca Ridge seafloor in the Northeast Pacific Ocean (Kelley et al., 2012, in this issue ...
Susan Hautala, H. Paul Johnson, Matthew Pruis, Irene García-Berdeal, Tor Bjorklund   +4 more
doaj  

Sulfur isotope rations of sulfide minerals from the deposit of the Tsuchikura mine, Shiga Prafecture, Japan [PDF]

, 1998
Sulfur isotope rations of sulfide minerals in the ore specimens from the deposit of the Tsuchikura mine are distrib-uted in a range from -0.8 to 5.4%, mostly from +0.5 to 3.0%, close to the previous data (from +1 to +3%) by Miyake and Sasaki (1980).
Harada, Kaori, Yamamoto, Masahiro, Kase, Katsuo   +2 more
core   +1 more source

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

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   +1 more source

Mantle flow geometry from ridge to trench beneath the Gorda-Juan de Fuca plate system [PDF]

, 2015
Tectonic plates are underlain by a low-viscosity mantle layer, the asthenosphere. Asthenospheric flow may be induced by the overriding plate or by deeper mantle convection1.
Totten, E, Richards, M, Richard M. Allen, Ian D. Bastow, Bastow, ID, Martin-Short, R, Robert Martin-Short, Mark A. Richards, Eoghan Totten, Allen, R   +9 more
core   +1 more source

The geochemistry and geomicrobiology of relict hydrothermal sulphide deposits

, 2000
The diagenetic re-mineralisation of seafloor-sulphide deposits and the role of microbes in the metal-exchange processes were investigated in metalliferous sediments from the Alvin relict hydrothermal zone in the TAG area at 26º8'N (Mid-Atlantic Ridge ...
Severmann, S.
core   +2 more sources

Co-registered Geochemistry and Metatranscriptomics Reveal Unexpected Distributions of Microbial Activity within a Hydrothermal Vent Field

Frontiers in Microbiology, 2017
Despite years of research into microbial activity at diffuse flow hydrothermal vents, the extent of microbial niche diversity in these settings is not known. To better understand the relationship between microbial activity and the associated physical and
Heather C. Olins, Daniel R. Rogers, Christina Preston, William Ussler, Douglas Pargett, Scott Jensen, Brent Roman, James M. Birch, Christopher A. Scholin, M. Fauzi Haroon, Peter R. Girguis   +10 more
doaj   +1 more source

Trace element distributions in ridge flank sediments from the east Pacific Rise, and their use as proxies of past ocean conditions

, 2008
The eastern equatorial and tropical Pacific regions are areas of significant carbon fluxes from theatmosphere to the ocean interior. Changes in the function of marine biogeochemical cycles in thisregion potentially exert an important control on global ...
Taylor, Sarah Louise
core   +2 more sources

Marine Magnetic Anomalies Enhanced by Internal Stress in Rapidly Cooled Submarine Basalts

Geophysical Research Letters
Marine magnetic anomalies are pivotal to our understanding of plate tectonics, geomagnetic fields, and deep Earth dynamics. However, the question of how Ti‐rich titanomagnetites, the primary remanence carriers in oceanic crust rocks, can faithfully ...
Fei Han, Huapei Wang, Yiliang Lv, Greig A. Paterson, Andrew J. Biggin, Wyn Williams, Tao Yang, Junxiang Miao, Ting Cao, Duowen Zhu, Chen Wen, Shaochen Hu, Xiaowei Chen, Mengqing Wang, Yiming Ma, Jiakun Fang, Jiabo Liu   +16 more
doaj   +1 more source

Composition and stratigraphy of late quaternary sediments from the northern end of Juan de Fuca Ridge

, 1981
Sediments from the northern end of Juan de Fuca Ridge are Late Quaternary in age and contain widely correlatable cycles of turbidity current and hemipelagic sedimentation. Sediments from the Ridge were examined for their mineralogy, structure, components
Cook, Raymond Arnold
core   +1 more source