Processing results from parametric drill hole Vassdalenskaya-3, Svalbard Archipelago, north side of Van-Meyen Fjord (Report 6593, Leningrad)

• Main Author: Bro, Evgeny G
• Format: Dataset
• Language: English
• Published: PANGAEA 1990
• Subjects: Archive of Ocean Data; ARCOD; DRILL; Drilling/drill rig; Svalbard; Vassdalensk-3; VNIIO-1981S; Arctic; Barents Sea; Svalbard Archipelago
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.690357; https://doi.org/10.1594/PANGAEA.690357

Reasons for drilling: 1. Study of geological structure of the north-western Barents Sea shelf according to the programs of study of Arctic geology and creating geological reference points for reliable referencing of geophysical data. 2. Detailed correlation with regional geological-geophysical sections of Late Paleozoic, Mesozoic and Paleogene deposits. Technical results: The hole has penetrated the section of 2352 m and stopped in Middle Triassic deposits. The hole was drilled 40 m to the south of the hole Vassdalensk-2. Scientific results: 1. Comprehensive lithologic and paleontological studies (based on different fauna groups) of drill samples from the hole have allowed to reveal lithologic features and to carry out a detailed lithologic and stratigraphic sequence of Mesozoic and Paleogene sedimentary rocks. 2. Thicknesses of the units are as followed: Middle-Late Triassic - 302 m, Jurassic - 174 m, joint Late Jurassic - Early Cretaceous - 89 m, Early Cretaceous - 979 m, Paleogene - 776 m, Quaternary - 32 m. 3. Complexes of sedimentary rocks based on their physical properties have been determined and their geophysical characteristics have been given. 4. Stratigraphic disconformity is supposed between Triassic and Jurassic, Middle and Late Jurassic, Hauterivian and Barremian, Cretaceous and Paleogene, Paleogene and Quaternary deposits. The Mesozoic-Cenozoic series is likely moved upon the Early Carboniferous one in north-eastern direction. Rocks of the moved series are consolidated due to catagenesis and stress. 5. A zone of tectonic dislocations (where significant parts of the stratigraphic succession are absent) has been found. The zone comprises Jurassic and Cretaceous border layers where a part of Tithonian and Berriasian deposits has been truncated by the dislocation. 6. The Mesozoic-Paleogene terrigenous rocks correspond to humid sedimentation. 7. Stratigraphic units, rock types, and rock complexes defined in the section are similar to ones in the adjacent areas. This has been a base for reliable ...