Processing results from drill hole 21, Murmanskaya Area (Report 5634, Leningrad)

• Main Authors: Ronkina, Zinaida Z, Basov, Valery A, Bro, Evgeny G
• Format: Dataset
• Language: English
• Published: PANGAEA 1983
• Subjects: Archive of Ocean Data; ARCOD; Barents Sea; DRILL; Drilling/drill rig; VNIIO-1983; VNIIO-1983-21; Kolguev; Murmanskaya; Pechora
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.690495; https://doi.org/10.1594/PANGAEA.690495

Area of drilling: Murmanskaya Area, southern part of the South Barents Deep, Barents Sea. Reasons for drilling: 1. Study 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 of 1600 m and stopped in Middle Jurassic (Callovian?) deposits. Scientific results: 1. Within the studied geological section a detailed lithologic and stratigraphic sequence of sedimentary rocks (based on microfauna, palynology, and lithologic composition) from Middle Jurassic to Quaternary deposits has been carried out. 2. Thicknesses of the units are as followed: Middle Jurassic (Callovian?) - 40 m, Late Jurassic - 342 m (Oxfordian-Kimmeridgian - 260 m, Tithonian - 82 m), Early Cretaceous - 948 m (Valanginian - 25 m, Barremian-Aptian - 71 m, Aptian - 522 m, Albian - 330 m), Late Cretaceous - 65 m, Neogene-Quaternary - 75 m, Quaternary - 17 m. 3. The section is mostly composed of clayey-silty sedimentary rocks formed in a marine basin. The main part of Mesozoic-Cenozoic deposits formed in a shallow marine basin. 4. Hiatuses in sedimentation during the pre-Cenozoic, the post-Valanginian and the post-Jurassic are assumed. 5. Sharp change of sediment composition occurred in the pre-Cenozoic and the post-Jurassic. 6. In the Late Jurassic the crust of weathering existed in the source area. 7. Sedimentary rocks are weakly lithified (early epigenesis - beginning of late epigenesis). 8. Composition of sedimentary rocks in the hole strongly differs from one of coeval deposits in the Kolguev Island and the Timan-Pechora region.