Results 141 to 150 of about 55,232 (202)
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Petrologic models for the Mid-Atlantic Ridge
Deep Sea Research and Oceanographic Abstracts, 1970Abstract Serpentinites and metabasites (metabasalts and metagabbros) occur in association with unmetamorphosed basalts in transverse fracture zones cutting deeply across the Mid-Atlantic Ridge. The serpentinites appear to have been formed by hydration of upper mantle peridotites.
Akiho Miyashiro +2 more
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Ultramafic Rocks from the Mid-Atlantic Ridge
Nature, 1968ACCORDING to the ideas of Hess1 the backbone of active mid-oceanic ridges should consist of peridotites which originated in the Earth's mantle and were subsequently upthrusted into the crust along the axis of ridges, above the up welling limbs of mantle's thermal convection cells.
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Argon-Lead Isotopic Correlation in Mid-Atlantic Ridge Basalts
Science, 1999Step-heating analyses for Mid-Atlantic Ridge glass samples show that maximum 40 Ar/ 36 Ar values correlate with 206,207,208 Pb/ 204 Pb. These correlations hold for the whole Atlantic Ocean and therefore are unlikely to result from shallow-level ...
, Sarda, , Moreira, , Staudacher
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The crest of the Mid-Atlantic Ridge
1986Abstract By 1854, there were enough deep ocean soundings to allow M. F. Maury to draw the first bathymetric chart of the North Atlantic Ocean in 1855. He defined the great shoaling “middle ground” of the Atlantic basin, later to be known as the Mid-Atlantic Ridge (MAR).
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Magnetic Anomalies over the Mid-Atlantic Ridge
Nature, 1963THE intensity of the Earth's magnetic field over the Atlantic Ocean has been measured on a number of flights organized by the Department of Mines and Technical Surveys of Canada and also under Project Magnet (U.S. Hydrographic Office). Some of these flights passed over the Mid-Atlantic Ridge and the magnetic observations show that there are large ...
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Sedimentary Serpentinites from the Mid-atlantic Ridge
SEPM Journal of Sedimentary Research, 1973ABSTRACT Indurated sedimentary rocks with serpentine minerals as major components were recovered from the lower slopes of transverse ridges associated with the Romanche Fracture Zone in the equatorial Mid-Atlantic Ridge. In addition to serpentine minerals, sedimentary serpentinites from the Mid-Atlantic Ridge contain grains of diopside, enstatite ...
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Age Relationships of Mid-Atlantic Ridge Sediments
1970Despite the fact that outcrops on the ocean bottom cannot be observed, it is often possible to make meaningful inferences about age relationships of Mid-Atlantic Ridge sediments by paleontologic methods. Data are briefly reviewed here to illustrate the utility of these methods.
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An off-axis hydrothermal vent field near the Mid-Atlantic Ridge at 30° N
Nature, 2001D. Kelley +11 more
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Report reviews studies of mid-Atlantic ridge
Physics Today, 1973A new report, Understanding the Mid-Atlantic Ridge, has been issued by the National Academy of Sciences. The report outlines an orderly approach to a comprehensive study of the Mid-Atlantic Ridge. It reviews present knowledge and hypotheses, states major unsolved problems and possible methods of solution, and presents outlines of recommended programs ...
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Canadian Journal of Earth Sciences, 1974
Bottom photographs and drilled rock cores collected on several mountain tops along the crest of the Mid-Atlantic Ridge near 45°N describe the sediment distribution, sediment dynamics and shallow stratigraphy of these sites. Lag pebble deposits and pebble waves indicate rapid changes in bottom current direction and velocities that may approach 100 cm/s
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Bottom photographs and drilled rock cores collected on several mountain tops along the crest of the Mid-Atlantic Ridge near 45°N describe the sediment distribution, sediment dynamics and shallow stratigraphy of these sites. Lag pebble deposits and pebble waves indicate rapid changes in bottom current direction and velocities that may approach 100 cm/s
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