Santrauka An article is devoted to the passion of ‘Baltica’ Edition – from the Yearbook – established in 1961, published first in 1963, and renewed in 1993 – to the present International Journal on Geosciences of the Baltic Sea and the circum-Baltic States, the story that follows 25 years of Academician Algimantas Grigelis editorial work. The article presents some thoughts about a role of regional journal(s) for science and society, it makes a short historical overview, reports an effectiveness of editorial system, notes tireless efforts for a high contents quality as a main tool for its international evaluation and publicity.
Raktažodžiai Baltic Sea; geology; geosciences; international journal
Santrauka A multi-temporal digital terrain models [DTM] study of a coastal cliff section at Kaszuby Coast (northern Poland) is presented in this paper. The analytical study was based on five LiDAR-derived DTM acquired between 2010 and 2016. The main idea was to compare changes year by year or every two years (depending on the available material). The DTM were analysed using various geoprocessing techniques, and as a result the map of slope and the gradient of maximum changes in z-value were prepared. The analysis of the temporal variations of these parameters were also prepared and allowed to visualize and track the landslides that occurred within the cliff. What is more, the areas of sediment increasement and decreasement, as well as the average rates of vertical displacement within the landslides and sediment balance on the beach were estimated. The studies allowed also to discuss the interrelation between the mass wasting processes and the protective infrastructure on the seashore. The information gathered allows us to find the mechanisms and development of landslides on the steep cliff coast.
Raktažodžiai cliff coast; landslide monitoring; northern Poland; land-sea interaction
Santrauka The continuous research on anthropogenized coastal zones determined qualitative and quantitative characteristics of aliphatic hydrocarbons in the Curonian Lagoon and the Nemunas River Delta. The concentration of aliphatic hydrocarbons varied from 9.1 to 187.6 μg g−1 d.w. The Curonian Lagoon could be classified as a slightly contaminated water basin with some moderately polluted areas, while both rivers and Lake Krokų Lanka were found to be slightly contaminated with aliphatic hydrocarbons. The prevailing unresolved complex mixture and geochemical markers suggested the existence of mixed biogenic-anthropogenic aliphatic hydrocarbon sources in the area studied. The biogenic impact was found to be more pronounced in Lake Krokų Lanka, the south-eastern part of the Curonian Lagoon and in the River Minija, while the Nemunas River Avandelta demonstrated the highest loading of anthropogenic hydrocarbons. The same trends were confirmed by the principal component analysis.
Raktažodžiai transitional water; aliphatic diagnostic ratios; hydrocarbon sources
Santrauka The thick-bedded, deep-water sandstone succession was described at the Tylmanowa site from the Polish Outer Carpathians. This part of the Carpathians is built mainly of the Upper Jurassic to Paleogene deep-water rocks. Succession at the Tylmanowa site is composed of massive, ripple-cross laminated, planar and trough cross-stratified, horizontally laminated and deformed sandstones as well as massive and horizontally laminated mudstones. All these sediments derived from gravity flows that prograde downslope from a basin margin towards the widespread abyssal plain. Exposed succession records the gradual transition from a decelerating debris flow to a turbidity current what is extraordinary in the recent investigations of deep-water sediments. The study succession has been compared with the widely known sediment models, such as: the classic Bouma Sequence (Bouma 1962), the high-density turbidite model (Lowe 1982), the fluxoturbidite model (Ślączka, Thompson 1981) and the hybrid event bed model (Haughton et al. 2009).
Raktažodžiai fluxoturbidites; hybrid event beds; sediment-gravity flow; Eocene; Carpatian Flysh Belt
Santrauka The scope of the study was to assess the impact of potential sources of Cu, Zn, Co, Ni, and Cr on bottom sediments of the Russian sector of the south-eastern Baltic Sea. A total of 68 samples were taken and analyzed for grain-size (laser diffraction and sieve method) and heavy metal concentration (atomic absorption spectroscopy method). To avoid the influence of the sorption capacity of the fine-grained sediments to accumulate the pollutants, the normalization of the heavy metal concentration to Fe was applied. The environmental indices (contamination factor and modified degree of contamination) were calculated. The research has shown the contribution of oil platform, pipelines, ports and wastewater treatment facilities on the geochemical composition of bottom sediments. The authors have identified the level of heavy metals contamination of the middle parts of the Curonian and Vistula spits as a result of alongshore transport of pollutants.
Raktažodžiai heavy metals; bottom sediments; normalization; environmental indices; Russian sector of the Baltic Sea
Santrauka An extraordinary variation of plastic and brittle deformation structures with periglacial, glaciotectonic and seismic features was observed within the unconsolidated, upper Pleistocene meandering river succession in the Slinkis outcrop in central Lithuania. Among these deformations, the following structures were described: (1) ice-wedge casts in the lower part of the sedimentary succession, linked to periglacial processes, (2) soft-sediment deformation structures, such as load structures (load casts, pseudonodules), flame structures and water/sediment-escape structures, all trapped in clearly defined layers in the upper part of the sedimentary succession, which are related to the propagation of seismic waves, and (3) faults occurring throughout the sedimentary succession, which are associated with glaciotectonic processes. To our knowledge, this is the first description and analysis of the combined presence of such a diverse range of deformation features caused by three trigger mechanisms in a meandering fluvial sedimentary succession.
Raktažodžiai soft-sediment deformation structures; brittle deformations; seismite; periglacial features; glaciotectonic deformations; liquefaction; meandering river deposits
Raktažodžiai Glacial Isostatic Adjustment; Earthquake; Coulomb Failure Stress; Finite element modelling; Baltic countries; Soft-sediment deformation structure; Seismites
Raktažodžiai lacustrine sediments, geochemistry, SEM, abiotic data, Lateglacial, Early Holocene, NE Lithuania
Santrauka The large Varena Iron Ore deposit of southeast Lithuania lies beneath 200–400 m thick sedimentary cover in the East European Craton. Several drilling projects have revealed that it contains ca. 70–200 million tons of iron ore. A metasomatic origin has been proposed by several investigators, with an igneous (mafic, ultramafic carbonatitic) origin also considered. Detailed micropetrography on a variety of ore-bearing and skarnitised samples through backscattered electron imaging, along with mineral chemical analysis and monazite dating by electron microprobe, provide support for a metasomatic origin. High-grade temperature (ca. 700–750° C) skarns containing forsterite, enstatite, spinel and diopside were formed preferentially in carbonate-rich rocks and were subsequently overprinted by amphibole-bearing (tremolite, actinolite, anthophyllite and hornblende) skarns. A low-temperature hydrous influx and changing redox conditions not only caused the serpentinization of the earlier skarns, but also deposited a considerable amount of iron ore in the form of magnetite. Iron was derived from various sources and was accompanied by sulphide, apatite, REE and other mineralizations. The ca. 1.78 Ga monazite grew during the regional metamorphism, while ca. 1.54 Ga is attributed to the last mineralization phases.
Raktažodžiai Varena Iron Ore deposit; metasomatism; skarn; iron ore; monazite dating