Rocks of the Mid-Atlantic Ridge

  title={Rocks of the Mid-Atlantic Ridge},
  author={Samuel James Shand},
  journal={The Journal of Geology},
  pages={89 - 92}
  • S. J. Shand
  • Published 1 January 1949
  • Geology
  • The Journal of Geology
A remarkable achievement by the Atlantis expedition (1947) of the Woods Hole Oceanographic Institution, under the leadership of Professor Maurice Ewing, was the recovery of several hundred pounds of boulders from depths approaching 2,500 fathoms over the Mid-Atlantic Ridge. Some of these boulders are of limestone and will be described elsewhere, but a large proportion consists of eruptive rocks referable to the following groups: (I) holocrystalline gabbroic rocks, (2) basalts (pillow lavas… Expand
Rocks of Northern Part of Mid-Atlantic Ridge
A petrographic study of rocks dredged from the Mid-Atlantic Ridge by the research vessel, Atlantis, in 1947 and 1948 shows that olivine basalt and basalt are the most common rock types of theExpand
Magnetic properties of some igneous rocks from the Mid‐Atlantic Ridge
Introduction. Five dredge haauls were obtained during the Atlantis mid-Atlantic ridge expedition of 1948–1949 between latitude 30°01′N, longitude 42°25′W and latitude 31°49′N, longitude 43°25′WExpand
Tertiary Sediment from the Mid-Atlantic Ridge
Dredgings and cores now available suggest that the upper layer of the crust of the ridge is constructed of layers of interbedded sediments and basalt flows, and rule out the possibility of large-scale continental drifting or spreading of the ocean floor since the Lower Miocene. Expand
Sands of the Mid-Atlantic Ridge
Sands collected at 24 locations along the crest of the Mid-Atlantic Ridge between 57�S and 38�N consist predominantly of olivine, diopsidic augite, hypersthene, enstatite, amphibole, quartz,Expand
Composition of Basalts from the Mid-Atlantic Ridge
Studies of volcanic rocks in dredge hauls from the submerged parts of the Mid-Atlantic Ridge suggest that it consists largely of tholeiitic basalt with low values of K, Ti, and P. In contrast, theExpand
1974—The year of the Mid‐Atlantic Ridge
Long known as a broad mountain range halfway between the North American and the European continents, the submarine mid-Atlantic ridge has been the target of intense investigations over the lastExpand
Gabbro and pyroxenite from a deep-sea core in the Indian Ocean
Abstract A sediment core was taken from a depth of 5,982 m in the Ob Trench bordering the Broken Ridge in the southeastern Indian Ocean. The core contained fragments of gabbros and pyroxenitesExpand
Additional evidence of existence of ancient rocks in the mid-Atlantic ridge and the age of the opening of the Atlantic
Abstract A metabasalt dredged at a junction of the median valley with the Atlantis fracture zone (30°01/tN, 42°04/tW) in the Mid-Atlantic Ridge shows complete recrystallization under a metasomaticExpand
A median valley of the Mid-Atlantic Ridge
Abstract A median valley of the Mid-Atlantic Ridge at least 75 miles in length running in a North-South direction is described. Its bottom lies at a depth between 1800 and 2200 fm and the flanks riseExpand
This paper presents primarily the soundings obtained by the Research Vessel ATLANTIS during the summer field season of 1947. It also utilizes some of the data obtained by later expeditions of theExpand


Concerning basaltic glass
fn the western portion of the Columbia River Plateau, a number of basaltic flows show evidence of aqueous chilling. A variety of results have been achieved dependent on the depth of the water and theExpand
Mylonites of St. Paul's Rocks (Atlantic): Am
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