New data about the deep heterogeneities of drake passage structures and the hydrocarbon potential of the Antarctic peninsula continental margin

: pp. 74-83
Received: October 10, 2012
Institute of Applied Problems of Ecology, Geophysics and Geochemistry
Institute of Applied Problems of Ecology, Geophysics and Geochemistry
Subbotin Institute of geophysics of National Academy of Sciences of Ukraine
Subbotin Institute of Geophysics of NAS of Ukraine
Subbotin Institute of Geophysics of NAS of Ukraine
Center for Management and Marketing in the field of Earth Sciences IGN NAS of Ukraine; Institute of Applied Problems of Ecology, Geophysics and Geochemistry

The results of investigations obtained during the seasonal geophysical works of the 17th Ukrainian Antarctic Expedition (March 2012) are given. The marine geoelectric researches by methods of forming a short-pulsed electromagnetic field (FSPEF) and vertical electric-resonance sounding (VERS) had been conducted in this region. In the vicinity of the Ukrainian Antarctic station (UAS) “Academician Vernadsky”, in the Drake Passage and Bransfield, as well as in the western Scotia Sea made more than 85 deep-sounding VERS (to a depth of 24 300 m). The total length of tacks taken by the VERS was 2424 km. According to the results of geoelectric studies four deep profile sections and a schematic map of Moho boundary were created. The deep geoelectric boundaries and large mantle heterogeneities distribution in different segments of the Drake Passage can be interpreted as large-scale processes of formation and deep transformation of the continental crust fragments under the influence of sufficiently large diapirs of partially molten upper mantle rocks. Four “hydrocarbon deposit” type anomalies were detected on Antarctic margin in the region of UAS “Academician Vernadsky” due the special technology of satellite data processing and interpretation using. Some anomalous parameters of polarized layers were chosen by VERS sounding within these anomalies. The total area of these anomalies previously identified from satellite data is about 900 km2. These data confirm the assumption about the possible existence of the new oil and gas area in this part of the Antarctic continental margin.

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