An examination of the Eltanin Dredged Rocks from the Scotia Sea

  1. Joseph L. Reid
  1. N. D. Watkins and
  2. R. Self

Published Online: 21 MAR 2013

DOI: 10.1029/AR015p0327

Antarctic Oceanology I

Antarctic Oceanology I

How to Cite

Watkins, N. D. and Self, R. (1971) An examination of the Eltanin Dredged Rocks from the Scotia Sea, in Antarctic Oceanology I (ed J. L. Reid), American Geophysical Union, Washington, D. C.. doi: 10.1029/AR015p0327

Author Information

  1. Florida State University, Tallahassee, Florida 32306

Publication History

  1. Published Online: 21 MAR 2013
  2. Published Print: 1 JAN 1971

ISBN Information

Print ISBN: 9780875901152

Online ISBN: 9781118664438



  • Basaltic fraction;
  • Eltanin dredged rocks, Scotia Sea;
  • Granitic and felsitic fraction;
  • Ice-rafted materials;
  • Metamorphic and roundness fraction;
  • Second-order trend surfaces


As a preliminary to a detailed study, the contents of each of over one hundred rock-dredge hauls, taken during Eltanin cruises 5 to 9, 12, and 22 in the Scotia Sea, have been classified in a system involving division of each recovered haul into rock groups which we call granitic, felsitic, basaltic, metamorphic, sedimentary, and manganese nodules, but which are sufficiently broad so that in most cases diverse associated rock types are incorporated. Estimates of the size of the rounded fraction of each haul were also made. Second-order trend surfaces and corresponding residual maps have been constructed on the normalized rock groups and the ‘roundness’ parameter of each dredge haul. East-west elongations characterize the metamorphic and roundness fractions, whereas other surfaces trend either north-south or southeast-northwest. Inconsistencies in collection methods and diversity of sources inhibit confident interpretation of the geological meaning of these observations. Since roundness and all rock fractions except basalt increase southward, however, it is suggested that the Antarctic Continent south of the Weddell Sea and the southeast coast of the Antarctic Peninsula are the dominant sources of ice-rafted rocks in the Scotia Sea.