Figure 1. Schematic map of the Late Riphean-Ordovician
tectonic evolution of Kazakhstan and northern Tien-Shan.
1 - Oceanic crust, 2 - continental crust, 3 - oceanic crust
basalts, 4 - suboceanic basalts of continental rifts,
5 - ensimatic island arc rocks: (a) volcanic rocks,
(b) tephroturbidite; (6-7) island arcs with transitional and
continental crust; (6) differentiated volcanics (a) and
tephroturbidites (b); (7) contrastingly differentiated volcanics
and their tuffs; (8) continental, mainly acid, volcanics;
(9) olistostroms; (10) siliceous and clayey-siliceous rocks;
(11) limestones, (12) terrigenous, mainly quartzose, deposits.