Processing results from drill hole VNIIO-1984-22 (the Murmanskaya Area) (Report 5753, Leningrad)

• Main Authors: Ronkina, Zinaida Z, Basov, Valery A, Bro, Evgeny G
• Format: Dataset
• Language: English
• Published: PANGAEA 1984
• Subjects: Archive of Ocean Data; ARCOD; DRILL; Drilling/drill rig; VNIIO-1984; VNIIO-1984-22; Barents Sea; Kolguev; Murmanskaya
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.690553; https://doi.org/10.1594/PANGAEA.690553

Area of drilling: Murmanskaya Area, southern part of the South Barents Deep, Barents Sea. Reasons for drilling: 1. Obtaining additional information on the geological section in the Murmanskaya area as well as data for stratification of the 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 2930 m and stopped in the Triassic deposits. Scientific results: 1. Comprehensive lithologic and paleontological studies (foraminifera, palynology) of drill samples from the hole have allowed to reveal lithologic features and to carry out a detailed lithologic and stratigraphic sequence of sedimentary rocks from Triassic to Early Cretaceous and from Neogene to Quaternary ones. 2. Thicknesses of the units are as followed: Late Triassic - 869 m, Early Jurassic - 285 m, Middle Jurassic (Aalenian and Bajocian-Bathonian) - 357 m, Late Jurassic - 116 m (Callovian - 63 m, Oxfordian?-Early Tithonian - 30 m, Middle-Late Tithonian - 23 m), Early Cretaceous - 962 m (Valanginian-Hauterivian - 31 m, Barremian-Aptian - 159 m, Aptian - 324 m, Albian - 448 m), Neogene?-Quaternary? - 120 m. Presence or absence of Late Cretaceous and Paleogene deposits (mapped in the South Barents Deep) in the section remains questionable. Presumably these deposits have low thickness and occur above the sampling interval. 3. Clayey-silty sedimentary rocks dominate in the hole. Sandy rocks are of secondary importance. 4. Sedimentation environment has been reconstructed. Middle Triassic to Early Jurassic sediments accumulated in lagoonal and lagoonal-continental conditions. Most part of Middle Jurassic to Quaternary(?) sediments accumulated in a marine mainly shallow basin. Its deepening was in the Late Jurassic. 5. Hiatuses are assumed in the post-Jurassic, post-Valanginian, and pre-Cenozoic time. 6. Composition of sedimentary rocks from the hole strongly differs from one of deposits in the Kolguev Island ...