Processing results from the parametric drill hole Nagursk-1 on the Alexandra Land Island, Franz Josef Land Archipelago (Report 5280, Leningrad)

• Main Authors: Shkola, Igor V, Sergeev, Dmitry V
• Format: Dataset
• Language: English
• Published: PANGAEA 1979
• Subjects: Alexandra Land Island; Franz Josef Land; Archive of Ocean Data; ARCOD; DRILL; Drilling/drill rig; Nagursk-1; VNIIO-1979; Arctic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.690352; https://doi.org/10.1594/PANGAEA.690352

Project 74-4/683 - Proceeding and Generalization of Materials of Parametric Drilling on Arctic Islands (Nagurskaya and Severnaya parametric drill holes on the Franz Josef Land Archipelago). Reasons for drilling: 1. Study of the geological-geophysical section from the first deep drill hole on the Franz Josef Land Archipelago for providing reliable referencing of geophysical materials, for establishing structure of the sedimentary cover, rock properties and composition. 2. Obtaining information for stratification of the section and its allocation with geophysical sections. Technical results: The hole has penetrated the section of 3204 m and stopped in Neoproterozoic (Ediacaran) deposits. Scientific results: 1. The hole has crossed terrigenous and carbonaceous sedimentary rocks, metamorphic formations, and magmatic intrusive and effusive rocks. Besides, the hole has crossed a series of steeply dipping high amplitude disjunctive dislocations. 2. Stratigraphic sequence (based on different faunal groups, leaf flora, sporen, pollen) of the section has been carried out. 3. Two rock complexes have been defined in the section. From surface up to 1895 m there occurs a platform mantle composed of Triassic and Carboniferous carbonaceous-terrigenous rocks and Cretaceous terrigenous-volcanogenic rocks. This platform mantle is underlain by a folded basement >1309 m thick composed of Neoproterozoic shales and quartzites. 4. The platform mantle rocks lay almost horizontally in the followed sequence (from down to up): Early Carboniferous sandy-silt deposits of a paralic coal-bearing formation (155 m), Upper Carboniferous biogenic limestones (83 m), Early and Middle Triassic shallow marine silty-clayey deposits (1375 m), Early Cretaceous sedimentary-volcanogenic formation composed of blanket basalts with layers of clays and coaly argillites (283 m). 5. Neoproterozoic (Ediacaran) basement rocks dip at angles of 20-750. Quartz-sericitic microschists predominate in the lower part, microquartzites - in the upper part. These rocks ...