Accession Number : AD0623453

Title :   GEOPHYSICAL STUDIES OF THE CRUSTAL STRUCTURE IN THE EAST ANTARCTICA,

Corporate Author : AERONAUTICAL CHART AND INFORMATION CENTER ST LOUIS MO LINGUISTIC SECTION

Personal Author(s) : Ushakov,S. A.

Report Date : JUN 1965

Pagination or Media Count : 142

Abstract : A brief historical review of geological and geophysical research of the Antarctic continent is given. Methods of seismic, gravimetric and geomagnetic observations conducted by the First-the Fifth Soviet Antarctic Expeditions are described. The thickness of the Earth's crust in the East Antarctica is determined according to Bouguer anomalies. It is found that the thickness of the crust about 35 km is prevailing on the larger part of the investigated territory and this is characteristic of a platform structure of the region. Some sections of the platform have undergone a considerable activization in the recent geological time. The activized sections are grouped into two types according to the thickness of the crust: (1) Sections the activization of which was not accompanied by an increase of the crust's thickness. These are located mainly in the peripheral zone of the East Antarctic platform. (2) Sections the acticization of which was accompanied by a considerable increase (up to 55 km) of the Earth's crust. These constitute the Gambourtsev Mountains.

Descriptors :   (*STRUCTURAL GEOLOGY, POLAR REGIONS), (*POLAR REGIONS, STRUCTURAL GEOLOGY), LITHOSPHERE, GEOPHYSICAL PROSPECTING, GLACIERS, GEOPHYSICS, USSR

Distribution Statement : APPROVED FOR PUBLIC RELEASE