fig09.htm

Figure 9. Sketch map showing tectonic subdivision of the East Siberian and Chukchi seas. 1 - continental areas with thick sedimentary cover of Neogene-Quaternary age; 2 - Okhotsk-Chukchi volcanic belt (Albian-Senonian). Mesozoides of northeastern Asia (3-4): 3 - Verkhoyansk-Kolyma fold-and-thrust area, 4 - Chukchi fold area; 5 - Chukchi massif (Precambrian crystalline basement highs), 6 - tectonic zones, central Alaskan and undivided; 7 - fold-and-thrust area of Brooks Range-Longa Strait (repeated deformations in Late Jurassic-Paleogene times); 8 - area of moderate deformations of thrust, reverse fault, and fold nature (repeated deformations in Late Jurassic-Paleogene times); 9 - area of zero or slight deformation in Jurassic-Cenozoic deposits; 10 - area with shallow occurrence and outcrops of Precambrian crystalline basement; in Anjou Islands, development of Paleozoic cover (De Longa massif); 11 - Lyakhovsky fold-and-thrust zone; 12 - Novosibirsk fold zone. Morphostructures of the Amerasia Basin (13-17): 13 - Canada Basin (oceanic crust overlain by sedimentary cover), 14 - rises with continental crust, 15 - basins with continental crust, 16 - continental slope, 17 - areas of uncompensated subsidence (sedimentary lenses). 18 - major basins; 19 - areas of strongest subsidence; 20 - rise within basin; 21 - uplifts of Ellesmerian basement (positive gravity anomalies); 22 - faults; 23 - frontal thrust of the Brooks Range; 24 - inferred boundary of deformed and undeformed domains; 25 - Barrow Arch; 26 - fossil spreading zone (from satellite altimetry data); 27 - shelf break; 28-30 - trends of ridges and basins on the Chukchi outer shelf.


This document was generated by TeXWeb (Win32, v.1.3) on August 20, 2003.