The Victoria Land Basin: Part of an Extended Crustal Complex between East and West Antarctica

  1. Muawia Barazangi and
  2. Larry Brown
  1. Yeadong Kim,
  2. L. D. McGinnis and
  3. R. H. Bowen

Published Online: 15 MAR 2013

DOI: 10.1029/GD014p0323

Reflection Seismology: The Continental Crust

Reflection Seismology: The Continental Crust

How to Cite

Kim, Y., McGinnis, L. D. and Bowen, R. H. (1986) The Victoria Land Basin: Part of an Extended Crustal Complex between East and West Antarctica, in Reflection Seismology: The Continental Crust (eds M. Barazangi and L. Brown), American Geophysical Union, Washington, D. C.. doi: 10.1029/GD014p0323

Author Information

  1. Department of Geology, Louisiana State University, Baton Rouge, LA 70803

Publication History

  1. Published Online: 15 MAR 2013
  2. Published Print: 1 JAN 1986

Book Series:

  1. Geodynamics Series

ISBN Information

Print ISBN: 9780875905143

Online ISBN: 9781118670118

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Keywords:

  • Earth—Crust—Congresses;
  • Continents—Congresses;
  • Seismic reflection method—Congresses

Summary

Seismic reflection soundings to 12 seconds two-way time in the southern Victoria Land Basin of the western Ross Sea indicate the presence of a deep sedimentary basin overlying a thinned crust. In addition to reflection data, seismic refraction and gravity studies provide control on the configuration of crystalline basement and depth to the Mohorovicic Discontinuity. Dipping reflectors suggest a basin depth of 13 km and a 200 km long reversed refraction profile provides a MOHO depth of 21 km below sea level. The basin contains undeformed sediments dipping seaward and is similar to continental margins which were formed by rifting. Since the only apparent periods of rifting occurred during the emplacement of the Ferrar dolerites and the McMurdo Volcanics, it is believed that the deep, layered strata are synrift sediments of Jurassic age and younger. Two areas of normal faulting bound the rifted basin on the east and west. Flat-lying glacial marine sediments with few internal reflections cover the basin. Present day high heat flow and active volcanism suggest that the basin beneath McMurdo Sound is undergoing a second phase of rifting. The Victoria Land Basin and the Wilkes subglacial basin lying west of the Transantarctic Mountains form part of an extensional complex along the boundary of East and West Antarctica.