PHYSIOGRAPHY AND TECTONIC SETTING OF THE SUBGLACIAL LAKE DISTRICT BETWEEN VOSTOK AND BELGICA SUBGLACIAL HIGHLANDS (ANTARCTICA)

Show simple item record

dc.contributor.author Tabacco I.E.
dc.contributor.author Forieri A.
dc.contributor.author Cianfarra P.
dc.contributor.author Salvini F.
dc.contributor.author Zirizotti A.
dc.date.accessioned 2024-12-15T02:15:11Z
dc.date.available 2024-12-15T02:15:11Z
dc.date.issued 2006
dc.identifier https://www.elibrary.ru/item.asp?id=14757714
dc.identifier.citation Geophysical Journal International, 2006, 165, 3, 1029-1040
dc.identifier.issn 0956-540X
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/46966
dc.description.abstract We present the interpretation of 11 radio echo-sounding (RES) missions carried out over the Vostok-Dome Concordia region during the Italian Antarctic expeditions in the period 1995-2001. The extension and the density of the radar data in the surveyed area allowed to reconstruct a reliable subglacial morphology and to identify four relevant morphological structures namely: the Aurora trench, the Concordia trench, the Concordia ridge and the South Hills. These structures show evidence compatible with the presence of tectonic features. Morphological considerations indicate their development in Cenozoic time. Hybrid cellular automata (HCA)-based numerical modelling allowed to justify a possible role played by the tectonics of the Aurora and Concordia trench evolution. This was accomplished by matching the bed profiles along opportunely projected sections with the modelled surfaces as derived by the activity of normal faults with variable surfaces within the continental crust. The Vostok-Dome C region is characterized by a large number of subglacial lakes. From the analysis of basal reflected power echo, we identified 14 new lakes and obtained information about their physiography as well as their possible relations with tectonics. We propose a grouping of subglacial lakes on the base of their physiography and geological setting, namely relief lakes, basin lakes and trench lakes. Relief lakes located in the Belgica subglacial highlands and are characterized by sharp and steep symmetric edges, suggesting a maximum water depth of the order of 100 m. Their origin may well relate to localized, positive geothermal flux anomalies. Basin lakes located in the Vincennes subglacial basin and are characterized by wider dimension that allow the development of well-defined, flat ice surface anomalies. Trench lakes characterize the Aurora and Concordia trenches as the possible effect of normal fault activity. © 2006 The Authors Journal compilation © 2006 RAS.
dc.subject ANTARCTICA
dc.subject HCA MODELLING
dc.subject RADIO ECHO SOUNDING
dc.subject SUBGLACIAL LAKES
dc.subject TECTONIC SETTING
dc.title PHYSIOGRAPHY AND TECTONIC SETTING OF THE SUBGLACIAL LAKE DISTRICT BETWEEN VOSTOK AND BELGICA SUBGLACIAL HIGHLANDS (ANTARCTICA)
dc.type Статья
dc.identifier.doi 10.1111/j.1365-246X.2006.02954.x


Files in this item

This item appears in the following Collection(s)

  • ELibrary
    Метаданные публикаций с сайта https://www.elibrary.ru

Show simple item record