Processing results from drill hole VNIIO-1983-81, Severo-Kildinskaya Area (Report 5801, Leningrad)

• Main Authors: Pchelina, Tatyana M, Bro, Evgeny G, Basov, Valery A, Komarnitsky, Valery M
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 1984
• Subjects: Drilling/drill rig; VNIIO-1983; Archive of Ocean Data ARCOD; Barents Sea; Spora; Kolguev; Pechora
• Online Access: https://dx.doi.org/10.1594/pangaea.690548; https://doi.pangaea.de/10.1594/PANGAEA.690548

The hole was drilled in the Severo-Kildinskaya Area in the southern part of the Barents Sea within the South Barents tectonic depression.Reasons for drilling:1. Specification of the geological structure of the area and obtaining data for stratification of the geological section and its allocation with reflecting seismic horizons.2. Study of properties, composition and lithologic-facial features of sedimentary rocks.Technical results:The hole has penetrated the section up to 1883 m and stopped in Early Triassic deposits.Scientific results:1. Within the studied geological section a lithologic and stratigraphic sequence of sedimentary rocks (based on microfauna, spora and pollen spectra, bivalve mollusks, and lithologic composition) from Early Triassic to Quaternary deposits has been carried out.2. Thicknesses of the units are as followed: Early Triassic - 310 m (Induan - 13 m, Olenekian - 297 m), Middle Triassic - 198 m, Late Triassic - 271 m, Early Jurassic - 152 m, Middle Jurassic - 178 m, Late Jurassic - 96 m, Neocomian - 124 m, Late Cretaceous - 96 m, Cretaceous-Paleogene - 173 m, Quaternary -25 m.3. Hiatuses are supposed between the Triassic and Jurassic and Early and Late Cretaceous.4. The Early-Middle Triassic deposits from the section differ from coeval layers in the Kolguev Island and Timan-Pechora region by high increase of gray-colored deposits, toneless series of multicolored deposits, and presence of layers of near-shore marine deposits.5. The Late Triassic series contains near-shore marine salts. It is intermediate between ones from southern and northern areas of the Barents Sea. It is supposed that that in the Late Triassic during the Early Carnian and Early Norian transgressions the area was in the near-shore marine zone.6. Silty and clayey deposits dominate in the section. The Early-Middle Jurassic deposits have higher arenosity that is traced regionally.7. The Middle Jurassic deposits accumulated in marine conditions; deposits from the Kolguev Island - on a continent. In the Upper Jurassic deposits in both areas accumulated in marine conditions.