The recent recognition that metallic mineral deposits are concentrated by hydrothermal
processes at seafloor spreading centers constitutes a scientific breakthrough that opens …

Geophysical evidence precludes the existence of a large, mainly molten magma chamber
beneath portions of the East Pacific Rise (EPR). A reasonable model, consistent with these …

Seafloor hydrothermal activity at mid-ocean ridges has a major impact on the chemistry of
the oceans [Edmond et al., 1979] and has been responsible for extensive alteration of …

Abstract Dissolved H 2 O and CO 2 contents in basaltic glasses from the Juan de Fuca
Ridge and neighboring seamounts were determined by infrared spectroscopy. CO 2 …

The crestal area of the mid-ocean ridge (MOR) is a stratigraphically complex and dynamic
environment where new lithosphere is created through intrusive and extrusive igneous …

Finite‐rotation parameters for 17 isochrons from anomalies 1‐4A for the Juan de Fuca‐
Pacific plate pair are reported. Comparison of confidence intervals for plate rotations derived …

Seamounts and islands are quite common features of the deep-ocean basins, particularly
the Pacific Basin. A conspicuous but relatively small number of these volcanoes are …

Sea MARC I side‐looking sonar images and Sea Beam bathymetry along a 400‐km stretch
of the Juan de Fuca Ridge crest provide evidence that excessive extrusive volcanism …

At least 70% of the volcanism on Earth occurs along the 65,000 km network of mid-ocean
ridge (MOR) spreading centers. Within these dynamic environments, the highest fluxes of …

Map** and sampling with DSRV “Alvin” has established that sulfide blocks 0.5 m across,
dredged from the axial valley of the Endeavour Segment at 47° 57′ N, are samples of …