Paleogen i podłoże mezozoiczne w otworze Goleniów IG-2 w Zielonczynie woj. szczecińskie

Edward Ciuk



The borehole Goleniów IG-2, made at Zielonczyn (north-west of Goleniów), entered Paleogene rocks directly beneath the Quaternary, 146.6 m thick. The Paleogene was found to be represented by marine sediments of the Lower Paleocene (Montian), Eocene and Oligocene, occurring at depths from 146.6 m to 422.0 m (135.3-410.7 m below sea level) and attaining 275.4 m in thickness. The Danian and Maestrichtian are missing here so the rocks discordantly rest on the Upper Campanian.
In this part of Poland marine Lower Paleocene (Montian, Puławy Beds) is developed in limestone-organodetritic facies of the "tuffeau" type with rich microfauna and numerous remains of bivalves and gastropods. Discovery of the Lower Paleocene in this area extended the known distribution of rocks of that age from the vicinities of Pamiętowo near Chojnice to the Szczecin region, connecting the former with the known occurrences in north-eastem GDR. Rich microfauna found inthese rocks comprises an assemblage of warm-water foraminifers. Montian limestones of the "tuffeau" type are overlain by fine-grained quartz sands with coal dust and microfauna of undefined higher Paleocene.
Eocene sediments are here 111.7 m thick (depth interval 291.7-403.4 m). The record of coal-bearing continental Lower Eocene (Zielonczyn Beds) at depths 378.6-403.4 m, was another discovery made here. The Lower Eocene is represented by coally mudstones and 4 brown-coal layers 0.3 to 4.4 m thick and the age is evidenced by results of palynological studies. Mudstones- and brown coals are rich in sulfur and salt. The Middle Eocene (Tanów Beds, depth interval 317.0- 378.6 m) is represented by quartz sands with coal dust and 0.5 m brown coal layer at the top, dated on the basis of spore-pollen analyses. The Upper Eocene ( depth interval 291.7 - 317.0 m) comprises a series of fine-grained quartz sands with glauconite and admixture of coarse quartz grains and fine gravel, 22.4 m thick, overlain by 2.9 m packet of silts and mudstones with 0.5 m brown coal layer at the top. The age of these sediments is still debatable but it should be noted that palynological analysis of samples from the depth 291.7- 293.6 m indicates still "Eocene character", presumably Upper Eocene one of sporomorphs.
The Oligocene, 145.l m thick (depth interval 146.6- 291.7 m) is represented by sediments assumed to be of the Lower Oligocene age and the Middle Oligocene (Rupelian) with full microfaunistic and palynological record.
The supposed Lower Oligocene comprises deeply green quartz-glauconitic sands with gravel-size grains of quartz and lydites and phosphorite nodules up to 5 cm in size and the Middle Oligocene - by muds, mudstones, claystones, clay shales with spherosiderites, with rich microfauna and fauna of bivalves and gastropods. The whole section of the Tertiary displays very strong fracturing, slickensides and dips of strata high or highly varying (from 25° to 80°) which indicates very strong tectonic involvement of the Mesozoic, Tertiary and presumably also Pleistocene.

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