ILI-BALKHASH REGION

Geological structure

Depressions in geological structure of southern Pribalkhashye participate in variegated deyrce metamorphosed and dislocated Paleozoic effusive-sedimentary and intrusive rocks, overlapped by Mezozoic-Cenozoic depositions of continental genesis [Sydykov Zh.S., Dzhabasov M.Kh., Makhmutov T.T. et al. Balkhash segment. Groundwaters. Alma-Ata: Gulym, 1992. 240 pp. with supplement of 48 pp. (in Russian)]. Sedimentary complex of the territory investigated consists from Paleogenic, Neogenig and Quaternary depositions.

Paleogenic and Neogenic depositions are composed of clays with lenses and interlayers of sands, sandstones, more seldom, of gravel-coarse gravels. They outcrop on day surface along margins of depression, and at the depression itself they submerge onto considerable depth. So, Neogenic clays roofing occurence depth changes from 0,5-21 m on peripheria of the depression up to 330-360 m in its central part.

On the territory described are situated Quaternary depositions of variegated genesis. In piedmont regions they are represented by alluvial-proluvial depositions of detrital cones, and in central part of in by alluvial, lacustrine-alluvial and eolic formations of the thickness from 3-5 up to 150-300 m. Mainly, these are sands more seldem, loams and clays, and in piedmont belt by gravels-coarse gravels.

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