Figure 2. Vendian remnant basin in the Sayan belt of accreted
terranes and basins (Mana zone). (A) Vendian fold-and-thrust pile
(near the mouth of the Angaloi Creek). Thrust sheets are made up
of oceanic crustal fragments (Kuvai volcanic suite), shelf
carbonate deposits of the cratonic margin (Angaloi Formation), and
a deformed remnant flysch basin. Thrust sheets are separated by
zones of volcanomictic carbonate melange. (B) Same, at the
Bespalsky Utes (Bespalsky Cliff)-Stolbik locality. Right,
transverse section across a recumbent fold composed of the upper
thrust sheet of Angaloi dolomites. Composition and shape of
carbonate clasts are the same in tectonic melange and in
gravitational flow deposits in the remnant flysch basin, deformed
during accretion of island arc onto the craton in the Vendian.
(C) A model for remnant flysch basin during the Early Vendian
accretion of the Siberian craton. Zone of olistostrome and coarse
debrite ("wild flysch") was related to syndepositional
overthrusts. Slope deposits give way to medial flysch with
submarine streams and the fan of graywacke turbidites (distal
thin-bedded flysch) fringing it.
Symbols: 1 - basic effusives, Kuvai Group, 2 - dolomites, Angaloi Formation, 3 - same,
preserving microphytolith and stromatolite structures,
4 - coarse-grained debrites with blocks and boulders of Kuvai and
Angaloi rocks, 5 - thick-bedded sand debrites and turbidites
lacking large fragments, 6 - tectonic melange of
volcanomictic-carbonate composition, 7 - same, of carbonate
composition, 8 - submarine streams and turbidites of fans and
levees, 9 - thin-bedded turbidites: siliciclastic, carbonate, and
hybrid, 10 - sense of overthrusting.