Data on the stratigraphy of jasper-basalt deposits of Ordovician age from Central Kazakhstan have been summarized. The age, succession, and correlation between these deposits are refined. Geological dating and correlation are based chiefly on conodonts and, to a lesser extent, on graptolites. It is established that the age of these formations in the west and east of Central Kazakhstan falls within the Early to Middle Ordovician and in the interior structures (Zhungar—Balkhash zone) it spans the entire Ordovician and, possibly, early Silurian. The siliceous and siliceous-terrigene deposits of Ordovician age are the deepest water hemipelagic and pelagic sediments, and their accumulation corresponds to the maximum of Arenigian-to-Llanvirnian transgression. The reported paleogeographic and paleotectonic data are in agreement with the existing paleotectonic reconstructions according to which Central Kazakhstan was a marginal basin of the West Pacific type during the Ordovician.

You do not have access to this content, please speak to your institutional administrator if you feel you should have access.