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Tectonic setting of basic volcanic rocks determined using trace element analyses
Analyses for Ti, Zr, Y, Nb and Sr in over 200 basaltic rocks from different tectonic settings have been used to construct diagrams in which these settings can usually be identified. Basalts eruptedExpand
Origin of extensional core complexes: Evidence from the Mid‐Atlantic Ridge at Atlantis Fracture Zone
The contrast in geologic structure observed on opposing flanks of the Mid-Atlantic Ridge, where it is offset by the Atlantis transform fault, illustrates how significant differences in crustalExpand
Central role of detachment faults in accretion of slow-spreading oceanic lithosphere
An examination of ∼2,500 km of the Mid-Atlantic Ridge between 12.5 and 35° N is presented, which reveals asymmetrical accretion along almost half of the ridge, suggesting that much of the variability in sea-floor morphology, seismicity and basalt chemistry found along slow-spreading ridges can be thus attributed to the frequent involvement of detachment faults in oceanic lithospheric accretion. Expand
Corrugated slip surfaces formed at ridge–transform intersections on the Mid-Atlantic Ridge
The strips of ocean crust formed at the inside corners of both transform and non-transform offsets on the Mid-Atlantic Ridge are punctuated by topographic highs—the 'inside-corner highs'1–3—whereExpand
Widespread active detachment faulting and core complex formation near 13° N on the Mid-Atlantic Ridge
Oceanic core complexes are massifs in which lower-crustal and upper-mantle rocks are exposed at the sea floor. They form at mid-ocean ridges through slip on detachment faults rooted below theExpand
Fault rotation and core complex formation : significant processes in seafloor formation at slow-spreading mid-ocean ridges (Mid-Atlantic Ridge, 13°–15°N)
[1] The region of the Mid-Atlantic Ridge (MAR) between the Fifteen-Twenty and Marathon fracture zones displays the topographic characteristics of prevalent and vigorous tectonic extension. NormalExpand
The role of seamount volcanism in crustal construction at the Mid‐Atlantic Ridge (24°–30°N)
An analysis of approximately 6000 km2 of Sea Beam swaths indicates that the floor of the median valley of the Mid-Atlantic Ridge (MAR) between 24°–30°N is strewn with near-circular volcanoes. We haveExpand
Building the crust at the Mid-Atlantic Ridge
The morphology of the sea floor at mid-ocean-ridge spreading centres provides a key to understanding how ocean crust is constructed. Images of the axial zone of the slow-spreading Mid-Atlantic Ridge,Expand
Rb, Sr, Y, Zr and Nb in some ocean floor basaltic rocks
Abstract X-ray fluorescence measurements have been made of Rb, Sr, Y, Zr and Nb in 35 samples of ocean floor basaltic rocks from four different areas of the oceans. Samples include fresh, weatheredExpand
Metal-depleted root zones of the Troodos ore-forming hydrothermal systems, Cyprus
The cupriferous pyrite deposits of Cyprus were precipitated from hydrothermal solutions derived by interaction of contemporaneous seawater with hot mafic rock at the ancient Troodos spreading centre.Expand