The Juan de Fuca plate is separated from the Pacific plate by en-echelon, northeast-trending spreading ridges (Juan de Fuca and Explorer ridges) and transform faults. A triple junction offshore Vancouver Island is hypothesized to be evolving at the junction of Juan de Fuca Ridge and Nootka fault (Rohr and Furlong, 1995). In this model, Explorer ...

Oct 15, 2014 · The Endeavour Segment is located in the northern half of the Juan de Fuca Ridge, an intermediate spreading center between the Pacific Plate and the Juan de Fuca Plate (Fig. 1 (a)). A ridge-parallel axial valley cleaves the central ridge crest and hosts five major hydrothermal vent fields (Fig. 1 (b)).

Jan 15, 2016 · The Cobb Offset represents a major geochemical division in the Juan de Fuca Ridge, with normal mid-ocean ridge basalt (N-MORB) dominating the oceanic crust south of the offset and enriched-MORB (E-MORB) dominating oceanic crust …

Feb 5, 2025 · The Endeavour segment of the Juan de Fuca ridge in the NW Pacific is an intermediate spreading ridge that has been studied for decades due to robust venting, focused in five main vent fields, along the axis (e.g., Kelley et al., 2012).

Jan 15, 2009 · The Juan de Fuca Ridge chimney sulfide mineral chip was the most heavily colonized of the polished minerals incubated at the seafloor (Edwards et al., 2003a). The accumulation of Fe-encrusted biofilms (composed of cells, extracellular structures, and mineral particles) occurred above pits and inside the pores of the sulfide mineral assemblage ...

Jul 15, 2007 · Samples for this study were collected by the ROPOS remotely operated vehicle during two expeditions to the Endeavour segment of the Juan de Fuca Ridge in 2003 and 2004. The sampling of sediments and other hydrothermal deposits were carried out along with microbiological experiments and deployment of various instruments on the seafloor, which ...

Oct 1, 2009 · The Juan de Fuca Ridge (JFR) system, located between 44°N and 48°N off the coasts of British Columbia, Canada, and Washington and Oregon, USA is a medium-rate spreading center with a half-spreading rate of about 3–4 cm/a (Fig. 1 a). The JFR is divided into the Middle Valley segment, the West Valley segment, the Endeavour segment, the Cobb ...

Dec 1, 2017 · The Juan de Fuca Ridge (JdFR) is located in the Northeast Pacific Ocean about 500 km off the coast of North America, and the Cleft Segment study area comprises the southern end of the JdFR system (Fig. 1).

Jun 1, 2014 · a) Axial Seamount, on the Juan de Fuca Ridge, rises from a water depth of ~ 2700 m (dark blue) to 1500 m (red orange) over a distance of ~ 25 km. The caldera is centered at ~ 130°W and 45°58′N. It is the most volcanically active volcano on the ridge, and hosts three main hydrothermal fields (Ashes, CASM, and International District), as well ...

Dec 30, 2001 · Measurements of δ 56 Fe in Juan de Fuca Ridge basalts and sulfides suggest that Fe isotopes are fractionated in hydrothermal systems. However, the data do not exclude the possibility of small δ 56 Fe differences between the rocks from which fluid Fe is derived and other igneous Fe, in which case fractionation in igneous systems is indicated.