HR: 11:35h
AN: T12C-06    [Abstracts]
TI: Geophysical and Geological Study of the Transition Zone Between the Mendeleev Rise and the Adjacent Siberian Shelf: Preliminary Results
AU: Kaminsky, V D
EM: kaminsky@vniio.ru
AF: All-Russia Research Institute for Geology and Mineral Resources of the World Ocean (VNIIOkeangeologia), 1 Angliysky Avenue, St. Petersburg, 190121 Russian Federation
AU: * Poselov, V A
EM: vap@vniio.nw.ru
AF: All-Russia Research Institute for Geology and Mineral Resources of the World Ocean (VNIIOkeangeologia), 1 Angliysky Avenue, St. Petersburg, 190121 Russian Federation
AU: Glebovsky, V Y
EM: gleb@vniio.nw.ru
AF: All-Russia Research Institute for Geology and Mineral Resources of the World Ocean (VNIIOkeangeologia), 1 Angliysky Avenue, St. Petersburg, 190121 Russian Federation
AU: Zayonchek, A V
EM: andrew@vniio.nw.ru
AF: All-Russia Research Institute for Geology and Mineral Resources of the World Ocean (VNIIOkeangeologia), 1 Angliysky Avenue, St. Petersburg, 190121 Russian Federation
AU: Butsenko, V V
EM: vicb@vniio.nw,ru
AF: All-Russia Research Institute for Geology and Mineral Resources of the World Ocean (VNIIOkeangeologia), 1 Angliysky Avenue, St. Petersburg, 190121 Russian Federation
AB: In 2005, integrated geological and geophysical investigations were carried out in the transition zone between the Mendeleev Rise and the adjacent shelf of the East Siberian Sea. The operations had two objectives: to understand the geological structures of these features; and to determine the outer limits of the Russian continental shelf in terms of UNCLOS Article 76. Observations included: deep seismic soundings, seismic refraction and seismic reflection observations; on-ice gravity measurements and geological sampling; and aeromagnetic and aerogravity mapping of an area covering approximately 140,300 km2 at a trackline spacing of about 10 km. The length of the main sublongitudinal seismic profile was 600 km, extending continuously along the Mendeleev Rise and across its transition to the Siberian Shelf. Preliminary interpretation of the data indicates that the thickness of the upper crust beneath Mendeleev Rise is in the order of 10-12 km. The thickness of sedimentary cover along the seismic line varies from 12 km in the south (North-Chukchi Flexure) to 3 km in the north (Mendeleev Rise). Potential field data suggest a block structure for the study area, whereas the results of bottom sampling at sites where the seabed was deeply incised and where bedrock was more likely to be exposed point generally to the possibility of local derivation of coarse bottom debris. The geological and geophysical evidence obtained during the Arctic-2005 expedition demonstrates a morphological and structural continuity between the Mendeleev Rise and the adjoining Siberian shelf.
DE: 3005 Marine magnetics and paleomagnetics (1550)
DE: 3010 Gravity and isostasy (1218, 1222)
DE: 3025 Marine seismics (0935, 7294)
DE: 3045 Seafloor morphology, geology, and geophysics
DE: 9315 Arctic region (0718, 4207)
SC: Tectonophysics [T]
MN: Fall Meeting 2005