Ronkina, Zinaida Z; Basov, Valery A; Bro, Evgeny G (1984): Processing results from drill hole VNIIO-1984-22 (the Murmanskaya Area) (Report 5753, Leningrad). All-Russian Research Institute for Geology and Mineral Resources of the World Ocean, St. Petersburg, PANGAEA, https://doi.org/10.1594/PANGAEA.690553
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Latitude: 70.033300 * Longitude: 39.166700
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.
The hole has penetrated the section of 2930 m and stopped in the Triassic deposits.
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 and the Timan-Pechora region.
7. Sedimentary rocks are weakly lithified (early beginning of late epigenesis).