fig05.htm

Figure 5. Paleo-transect across the southern Yenisei-Cis-Sayan foredeep (parallel to the fold-and-thrust belt), after J. K. Sovetov and V. V. Blagovidov. The Late Vendian molasse assemblage rests with structural unconformity on Riphean strata of the continental margin basin and with minor angular unconformity on rock assemblages of Late Riphean aulacogens predating the formation of foredeeps. The foredeeps are separated from each other by an intramontane uplift with a reduced molasse section, the oldest deposits of the molasse assemblage occurring in the southern Yenisei-Cis-Sayan foredeep. From Late Aleshino time on, principal depositional phases and their coeval succession of sedimentary systems in the foredeeps were controlled by orogenic activity in the fold-and-thrust belt on the west of the Siberian craton.
Symbols: 1-4 - sedimentary Groups of Late Riphean aulacogens: 2 - Karagas, 3 - Oslyansky, 4 - Chingasan; the upper fluvial assemblage, sedimentary systems of braided sand-gravel dominated stream (5); the upper shallow marine assemblage, sedimentary systems of the foreshore zone (6). Nomenclature of stratigraphic units. Late Riphean Groups: Chn - Chingasan; Osl - Oslyansky; Kr - Karagas; Late Vendian Chapa (Nemchansky) Group, Formations and Subformations: Suv - Suvorovsky; Pd - Podyemsky; Tz 1  - Lower Taezhninsky (Lower Nemchansky), Tz 2 -Nm 2  - Upper Taezhninsky (Middle Nemchansky); Ugl 1 -Nm 3  - Lower Uglovsky (Upper Nemchansky), Ugl 2  - Upper Uglovsky. Late Vendian Oselkovaya Group, Formations and Subformations: Gg - Georgievsky; As 1  - Lower Aisa; As 2  - Upper Aisa; Ust 1  - Lower Ust-Tagul. Other symbols, as in Figure 4.


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