The Victoria Land Basin: Part of an Extended Crustal Complex between East and West Antarctica
- Muawia Barazangi and
- Larry Brown
Published Online: 15 MAR 2013
Copyright 1986 by the American Geophysical Union.
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
- Published Online: 15 MAR 2013
- Published Print: 1 JAN 1986
Print ISBN: 9780875905143
Online ISBN: 9781118670118
- Seismic reflection method—Congresses
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.