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… 
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 the
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′W
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.
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,
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, the
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 last
New Interpretation of the Geology of Iceland Geological Society of America Bulletin
Two active transform faults are identified on land in Iceland. This observation leads to a new interpretation of the tectonics of Iceland that is generally consistent with the available geologic,


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 the
The Geology of Ascension Island
The rocks of Tristan d'Acunha Island brought back by
  • South Africa Philos. Soc. Trans
  • 1904
Mylonites of St. Paul's Rocks (Atlantic): Am
  • Jour. Sci
  • 1947
Gesteine der Atlantischen Inseln St . Helena , Ascension , Sao Vincente ( Kap Verden ) und Sao Miguel ( Azoren ) : Deutsch Sudpolar
  • 1912
Also Report on the petrology of the rocks of St. Paul (Atlantic)
  • Peridotit von der St. Paul's Insel im Atlantischen Ocean: Neues Jahrb. 1879
Chemische und petrographische Untersuchungen an Gesteinen von Angra Pequena, der Cap Verdischen Insel St. Vinzente, von Cap Verde und von der
  • Insel San Miguel (Azoren): Geol. Reichsanstalt Jahrb