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DEVONIAN OF THE TEISSEYRE−TORNQUIST ZONE IN THE SOUTHWESTERN MARGIN OF THE EAST EUROPEAN PLATFORM (UKRAINE)

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Geology & Geochemistry of Combustible Minerals No. 3-4 (172-173) 2017, 41-55.

Danylo DRYGANT

State Museum of Natural History of National Academy of Sciences of Ukraine, Lviv, e-mail: d.drygant@gmail.com

Abstract

The Teisseyre-Tornquist Zone (TTZ) in the southwestern (Volyn-Podolian) margin of the East European Platform is an graben feature up to 75 km-wide. It is distinguished by most deepened (about 3200-4000 m) base of Paleozoic succession and by maximal increased thickness of the Silurian deposits. The graben is formed by marine sediments of Cambrian (520 m), Ordovician (about 150 m), Silurian (900-1500 m) and Devonian (about 1900 m thick) in age. Silurian sections are represented by monotonous sequence of dark graptolite shales (boreholes Rava-Ruska-1, Lishchynska-1, Zahaypil-1) or by claystones interbedded within the nodular limestone layers (bor. Krekhiv-1). Devonian deposits in TTZ, as elsewere in southwestern margin of the Platform, conformably overlay Silurian strata and form with them an uninterrupted succession of the marine deposition (however, boundary between systems is not well-expressed by change of lithology in sections).

Lithologically less changeable (of glimpse) successions of Lower Devonian, ranging in age from the Lochkovian to the Emsian, are divisible into two units named as series: Tyver (lower 530 m) and Dniester (upper 485 m). Sections of the first of them unlike, in contrast to typical outcrops in Podolia, are mainly represented by shales (bor. Rava-Ruska-1, 1342-1872 m), shales and siltstones (bor. Lishchyny-1, 2046-2576 m) or by alternating of dark- and red-colored sandstones, siltstones also claystones (bor. Krekhiv-1, 2472-3002 m), rarely occur limestones and marls (bor. Davydeny-1, 1664-2194 m). Deposits identified as belonging to Dniester Series and compound by dark and red colored sandstone, siltstone and claystone rocks, are discovered in borholes Krekhiv-1 (1986-2472 m), Nesteriv-1 (1620-2056 m), Lishchyny-1 (1560-2046 m).

Middle–Upper Devonian deposits (nearly 895 m thick) in TTZ form with underlying strata a continuous succession of marine sediments (without any interruption in sedimentation in passing from Lower Devonian into Eifelian also in passing from Famennian into Carboniferous). Deposits in lower part of interval, redefined as Middle and Upper Devonian in age, consist of multicoloured hemipelagic sandstones, siltstones and claystones (bor. Krekhiv-1, Vel. Mosty-30). sections in the northeastern part of the Volyn-Podolian (eastward of the Ustyluh-Rohatyn displacement zone) are formed mainly by limestones and dolostones (bor. Lytovezh-1, Sokal’-1 and oth.). The stratigraphic gap between Eifelian and oldest deposits gradual increases to eastern margin of Middle Paleozoic sedimentary basin.

Regional investigation of the geophysical logs and discovered rocks in boreholes showed that the Devonian as well the oldest Paleozoic deposits in TTZ are continuous, unfolded and unfaulted also with steady thickness of synchronogenetic stratigraphic unites in different sections.

Keywords

Devonian, Teisseyre-Tornquist Zone, Volyn-Podillya, East European Platform.

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