Modern geodynamic model of the Arctic Ocean

Transcription

1 Modern geodynamic model of the Arctic Ocean O. Petrov, N. Sobolev, A. Morozov, G. Grikurov, S. Shokalsky, S. Kashubin, E. Petrov Vienna, April 2012

2 Atlas of Geological Maps of the Circumpolar Arctic Magnetic and Gravity Anomaly Maps (Norway, 2008) Geological Map (Canada, ) Tectonic Map Draft (Russia, 2012) Metallogenic Map Map of the oil-and-gas bearing basins The project was initiated in It marked the beginning of the new stage in cartographic generalization of geological and geophysical data collected during the last decade on the Arctic territory. It is being implemented by the geological surveys of the Arctic states: Russia, Canada, the USA, Norway, Denmark, Sweden, and Germany with active support from the UNESCO Commission for the Geological Map of the World (CGMW). A series of working meetings dedicated to the implementation of the project took place in in Calgary, Anchorage, Tromsø, Trondheim, Paris, and Saint Petersburg

3 UNESCO Commission for the Geological Map of the World (CGMW)

4 A series of working meetings,

5 GEOLOGICAL MAP OF THE ARCTIC scale 1:5,000,000 (to 60 degrees N) Led by Geological Survey of Canada Open File 5816 MAGNETIC AND GRAVITY ANOMALY MAPS OF THE ARCTIC Led by Geological Survey of Norway

6 Tectonic Map of the Circum Arctic at 1:5M scale (TeMAr Draft)

7 Atlas of Geological Maps of the Circumpolar Arctic at 1:5,000,000 scale 34 th 33 rd 35 th

8 Delimitation of the Outer Continental Shelf Boundaries Integrated geophysical and bathymetric investigations have been carried out in accordance with international requirements during the Arctic-2011 field trip, including km of seismic lines using seismic reflection method and CDP km of bathymetric lines - 94 buoy seismic stations using seismic reflection method and seismic refraction method

9 State geological mapping at 1: 1M scale

10 Seismic data Reflection seismics Wide-angle seismics

11 Scientific Principles shelves the map should ensure correlation of the cartographic view of geological structures of deep water parts of the Arctic basin, shelves of the marginal seas and above ground areas of the continental oceanic framing; continental framing deep-water structures continental framing in oceanic domains areas with mixed age oceanic crust and spreading structures are distinguished. In the areas with continental crust, two groups of geological complexes indicators relating to two main types of tectonic processes are mapped. (1) The first group comprises crust forming constructive (accretion collision) processes. (2) The second group comprises destructive processes and magmatic reprocessing of already formed continental crust (riftogenesis and intraplate magmatism with the formation of large igneous provinces (LIPs) and basic dyke belts that characterize processes of paleocontinental break up; sedimentary basins in the Arctic are gigantic beyond comparison and are notable for their complex structure, so they are mapped as a separate group of mapped objects.

12 Tectonic Map of the Circum Arctic at 1:5M scale (TeMAr Draft)

13 New isotope geochronological studies in the Arctic region

14 New isotope geochronological studies in the Arctic region

15 The history of the tectonic evolution of the Arctic region can be divided into following main stages of the continental crust formation and transformation: Mesoproterozoic (Grenville); Late Vendian Early Cambrian (Baikal); Silurian Early Devonian (Caledonian); Late Devonian Early Carboniferous (Ellesmere); Late Permian Triassic (Uralian); Early Cretaceous (Brooks); Paleogene Neogene.

16 Schematic paleo tectonic zoning of the Arctic demonstrating the areas with formation of Caledonian and Ellesmerian folding

17 Schematic paleo tectonic zoning of the Arctic at the time of formation of Laurussia and Pangaea

18 Schematic paleo tectonic zoning at the time of opening and the island arc stage of evolution of the Southern Anyuy ocean

19 The international expedition to the New Siberian Islands 2011

20 The international expedition to the New Siberian Islands 2011

21 Schematic paleo tectonic zoning at the time of opening and the island arc stage of evolution of the Southern Anyuy ocean

22 Schematic paleo tectonic zoning at the time of the Southern Anyuy ocean closure

23 Schematic paleo tectonic zoning during the Late Cretaceous Early Paleogene The Late Cretaceous Cenozoic uplift magnitude in the South East of the Barents Sea

24 Seismic stratigraphic profile Franz Josef Land the North Pole

25 Schematic paleo tectonic zoning during the Late Cenozoic

26 In conclusion I would like to highlight few common features in the structure of young platforms by the example of West Siberia and the Cretaceous Cenozoic basin of the Eastern Arctic. We distinguish several stages in the evolution of these megastructures syncollisional rigtogenesis that was accompanied by the formation of large trap provinces: the Triassic one in Siberia and early Cretaceous in the Arctic common post rifting downwarping of the territory with different amplitude, which resulted in the formation of very large sedimentary basins West Siberian and Amerasian ones high amplitude multidirectional vertical tectonic movements on the border of large geo blocks and re activation of earlier founded rifts

27 Thank you for the attention!