Results 111 to 120 of about 6,578 (212)
Volcanoes, Plates, and Chains [PDF]
In this lesson students will discover how seamounts in the Axial-Cobb-Eikelberg-Patton chain were formed. They will learn about the processes that form seamounts, describe the movement of tectonic plates in the Gulf of Alaska region and explain the types
core
Gabbroic xenoliths and host ferrobasalt from the southern Juan de Fuca Ridge
Journal of Geophysical Research: Solid Earth, 1986 Rare isotropic gabbroic xenoliths occur in sheet and lobate flow fragments of nearly aphyric ferrobasalt collected along a 12‐km section of the southern Juan de Fuca Ridge. Xenoliths comprise ≪ 1% of the dredge contents and range in size from 1 cm3 (glomerocryst) to 240 cm3.
Dixon, Jacqueline Eaby +2 more
openaire +4 more sources
Seismic potential associated with subduction in the northwestern United States [PDF]
, 1984 Despite good evidence of present-day convergence of the Juan de Fuca and North American plates, there has been remarkably little historical seismic activity along the shallow part of the Juan de Fuca subduction zone.
Heaton, Thomas H., Kanamori, Hiroo
core
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 +10 more
doaj +1 more source
Beyond the ocean frontier: the Juan de Fuca Ridge
, 1986 Two thousand metres below the surface of the Pacific Ocean off Canada's west coast is an underwater mountain range called the Juan de Fuca Ridge. Its steaming vents spew forth an abundance of molten minerals, supporting a unique ecosystem denied the privileges of light.
openaire +1 more source
Marine Metallic Mineral Resources of the Pacific Basin [PDF]
In the 1970s and 1980s, the ocean became a focus of attention for mineral producers and consumers. This paper surveys that trend with particular emphasis on several specific metals and types of resource deposit.
Clark, Allen L., Clark, Jennifer Cook
core +1 more source
Marine Magnetic Anomalies Enhanced by Internal Stress in Rapidly Cooled Submarine Basalts
Geophysical Research LettersMarine 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 +16 more
doaj +1 more source
Geochemistry, Geophysics, GeosystemsPlagioclase crystals in plagioclase ultraphyric basalts (PUB) record changes in the major, trace, and isotopic compositions of evolving magmas. Those changes represent the record of specific processes in the crust and upper mantle that impart distinct ...
John B. Hewitt +2 more
doaj +1 more source
Measurements and Models of Heat Flux and Plumes from Hydrothermal Discharges Near the Deep Seafloor [PDF]
Oceanography, 2012 Deep-sea hydrothermal vents are conduits of heat and chemicals from the lithosphere to the hydrosphere. Their plumes rise hundreds of meters from the seafloor into the water column; during their ascent, they entrain ambient water and are subject to cross
Daniela Di Iorio +7 more
doaj
Non‐Rayleigh Statistics of Ultrasonic Backscattered Echo from Tissues [PDF]
, 1994 The envelope of the backscattered signal from tissues can exhibit non‐Rayleigh statistics if the number density of scatterers is small or if the variations in the scattering cross sections are random. The K distribution which has been used extensively in
Molthen, Robert C. +3 more
core +1 more source