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Crustal structure of the East Siberian continental margin, Podvodnikov and Makarov basins, based on refraction seismic data (TransArctic 1989–1991)

By
N. N. Lebedeva-Ivanova
N. N. Lebedeva-Ivanova
Department of Earth Sciences, Uppsala University, Villavagen 16, SE-75236, Uppsala, SwedenPresent address: Woods Hole Oceanographic Institution, 266 Woods Hole Road, Woods Hole, MA 02543, USA
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D. G. Gee
D. G. Gee
Department of Earth Sciences, Uppsala University, Villavagen 16, SE-75236, Uppsala, Sweden
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M. B. Sergeyev
M. B. Sergeyev
Polar Marine Geological Research Expedition, Pobeda St. 24, St Petersburg, Lomonosov 188512, Russia
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Published:
January 01, 2011

Abstract

The c. 1500 km-long refraction and shallow reflection seismic profile, TransArctic 1989–1991 from the East Siberian shelf northwards across the Podvodnikov and Makarov basins, provides a four-layer model of the crust: layer I (Vp=1.7–3.8 km s−1) of sedimentary formations of late Mesozoic and Cenozoic age; layer II (Vp=5.0–5.4 km s−1) of older sedimentary rocks on the shelf and possibly also mafic volcanics in the basins; layer III (Vp=5.9–6.5 km s−1); and layer IV (Vp=6.7–7.3 km s−1) of crystalline crust. The East Siberian margin has c. 40 km thick continental crust, mainly composed of layers III and IV, both c. 15 km thick. Beneath the Podvodnikov Basin, the Moho depth varies from c. 20 km bsl at southern and northern ends to c. 30 km bsl at the centre beneath the Arlis Gap; it was probably formed by longitudinal extension of continental crust during the late Mesozoic. The edge of the Alpha–Mendeleev Ridge, separating the Podvodnikov and Makarov basins, has a crustal thickness of c. 25 km, mainly composed of layers III and IV. The deep Makarov Basin is probably composed of oceanic crust, 8–12 km thick, but includes spurs of continental crust, rifted off the Lomonosov Ridge.

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Contents

Geological Society, London, Memoirs

Arctic Petroleum Geology

Anthony M. Spencer
Anthony M. Spencer
Statoil, Norway
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Ashton F. Embry
Ashton F. Embry
Geological Survey of Canada, Canada
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Donald L. Gautier
Donald L. Gautier
United States Geological Survey, USA
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Antonina V. Stoupakova
Antonina V. Stoupakova
Moscow State University, Russia
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Kai Sørensen
Kai Sørensen
Geological Survey of Denmark and Greenland
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Geological Society of London
Volume
35
ISBN electronic:
9781862394100
Publication date:
January 01, 2011

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