Baltica最新文献

{"title":"Analytical characterization of “Indonesian amber” deposits: evidence of formation from volcanic activity","authors":"Barbara Kosmoswska-Ceranowicz, M. Sachanbiński, B. Łydżba‐Kopczyńska","doi":"10.5200/BALTICA.2017.30.06","DOIUrl":"https://doi.org/10.5200/BALTICA.2017.30.06","url":null,"abstract":"In this study the new mineralogical and geochemical evidence for the reason behind intensive resin production in trees and the formation of Indonesian resin deposits is presented. The analysed specimens of the “Indonesian amber” were subjected to the following comprehensive investigations: PAS, IR, RS XRD and SEM-EDS. It was found that the resins are originated due to intensive volcanic activity. Based on spectroscopic investigations, “Indonesian amber” was assigned to the glessite group. The investigations revealed that the traces of volcanic activity have survived in the studied specimens in their structure were the presence of tonstein and inorganic minerals are related to volcanic phenomena. “Floating” in opaque solid–foam resin indicated that resinous substance was strongly heated trough volcanic activity.","PeriodicalId":55401,"journal":{"name":"Baltica","volume":"30 1","pages":"55-60"},"PeriodicalIF":0.7,"publicationDate":"2017-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44322619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of hydrokinetic resources of small and medium-size rivers: the Lithuanian case","authors":"B. Gailiušis, D. Jakimavičius, D. Šarauskienė, A. Jurgelėnaitė","doi":"10.5200/BALTICA.2017.30.03","DOIUrl":"https://doi.org/10.5200/BALTICA.2017.30.03","url":null,"abstract":"The aim of the study is to assess hydrokinetic energy resources of small and medium-size rivers in Lithuania. The estimation of technical resources was carried out for river segments, where for average longterm runoff the flow velocity exceeded 0.4 m/s, and the average depth was more than 0.5 m. The results of hydrological studies were used to calculate the average flow rate and the relationship between flow velocity and river depth. The width and depth of the river channel was estimated in accordance with physical and geographical factors. Part of the favourable for use sites of rivers located within protected areas cannot be used for energy production because of the priority of environmental protection. Navigation, recreation and other factors also limit the use of streams for energy production. In addition, in winter due to ice phenomena, hydrokinetic devices in small and medium rivers should be protected from mechanical obstacles. Moreover, Lithuania is a flat country and available hydrokinetic resources of such plain rivers are very small. Their estimated capacity comprises 13.6 MW, and they can generate 79.4 GWh of electric energy per year.","PeriodicalId":55401,"journal":{"name":"Baltica","volume":"30 1","pages":"23-30"},"PeriodicalIF":0.7,"publicationDate":"2017-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46316884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Weighty contribution to world marine geosciences knowledge: a review","authors":"A. Grigelis, H. Vallius","doi":"10.5200/BALTICA.2017.30.07","DOIUrl":"https://doi.org/10.5200/BALTICA.2017.30.07","url":null,"abstract":"","PeriodicalId":55401,"journal":{"name":"Baltica","volume":"30 1","pages":"61-62"},"PeriodicalIF":0.7,"publicationDate":"2017-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43738902","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Heavy-mineral derived provenance study of Quaternary sediments of the Mazovian Lowland, Central Poland","authors":"E. Kalińska-Nartiša, M. Nartišs","doi":"10.5200/BALTICA.2017.30.01","DOIUrl":"https://doi.org/10.5200/BALTICA.2017.30.01","url":null,"abstract":"This study makes an attempt to characterise Quaternary sediments in terms of their heavy minerals (HM) composition. Authors focus on the Mazovian Lowland, Central Poland, where a number of clastic sediments of different age and origin overlap. Five sedimentary settings, covering the Saalian-Holocene (MIS 1-6) time frame, have been studied to reveal whether these sediments have single or multiple source areas and to decipher sediment transformations. In the glacial setting either garnetor amphibole-dominated sediments occur. This unequivocal mineral combination likely reflects a multi-sourcing resulting from multi-directional ice advance. The HM taken from fan-like forms and aeolian sediments are closely related; these sediments are largely multicyclic and likely derived from pre-existing recycling sediments. Similar mineral suite is also typical for long-lasting aeolian processes and is observed in dune sediments. Ultrastable components are less frequent in the coversand, which points at a shorter-lived aeolian process. Finally, the fluvial setting reveals multi-sourcing largely depending on local geological conditions.","PeriodicalId":55401,"journal":{"name":"Baltica","volume":"30 1","pages":"1-14"},"PeriodicalIF":0.7,"publicationDate":"2017-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47988059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Heavy metals in sediments of the Gulf of Finland : a review","authors":"E. Emelyanov, H. Vallius, V. Kravtsov","doi":"10.5200/BALTICA.2017.30.05","DOIUrl":"https://doi.org/10.5200/BALTICA.2017.30.05","url":null,"abstract":"The Gulf of Finland has during the last centuries been loaded with heavy metals of anthropogenic origin. Work with mapping of the chemistry of the sediments have been done in all surrounding countries during several decades, first in the Soviet Union and later in Russia and similarly in Finland. More recent sediment chemistry data from the last two decades was in this study combined into sediment chemistry maps added with some data from the commercial Nord Stream project. The result shows that zinc, copper and chromium are enriched in the eastern part of the Gulf of Finland, while mercury, cadmium and lead are showing the highest concentrations in the northeastern part of the gulf.","PeriodicalId":55401,"journal":{"name":"Baltica","volume":"30 1","pages":"47-54"},"PeriodicalIF":0.7,"publicationDate":"2017-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48922939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pollution history of Neva Bay bottom sediments (eastern Gulf of Finland, Baltic Sea)","authors":"D. Ryabchuk, H. Vallius, V. Zhamoida, A. Kotilainen, A. Rybalko, N. Malysheva, N. Deryugina, L. Sukhacheva","doi":"10.5200/BALTICA.2017.30.04","DOIUrl":"https://doi.org/10.5200/BALTICA.2017.30.04","url":null,"abstract":"Neva Bay is the shallowest and easternmost part of the Gulf of Finland (Baltic Sea). St. Petersburg, Russia’s second largest city, occupies the coastal area where the Neva River debouches into Neva Bay. St. Petersburg has a protracted history of industrial, transportation and urban related activity that have affected Neva Bay. By the sealing off the bay from the eastern Gulf of Finland, the St. Petersburg Flood Protective Facility, which was constructed from the 1970‘s to 2011, transformed Neva Bay into a “technogenic” lagoon. Neva Bay sediments record a unique history of pollution near the metropolis. Heavy metal concentrations of most elements studied varied consistently throughout sediment cores. Temporal trends indicate that metals started to accumulate abruptly in the first half of the 20th century. Zinc, lead and copper were the first metals to reach contaminant thresholds implicating the regional base metal industry as a source. Significant increase in cadmium levels a decade or two later suggests pollution from the regional chemical industry. Comparison of geochemical data collected from sediment cores and recent annual sediment surveys highlighted the temporal history and potential sources of pollution in Neva Bay. Intensive dredging in 2007–2008 resuspended and redistributed contaminated sediment around Neva Bay causing a dramatic increase in benthic sediment heavy metal concentrations. Concentrations of all measured metals subsequently declined from 2009–2014 relative to the elevated values observed for 2007–2008. Pollution history of Neva Bay bottom sediments is closely linked with changing of sedimentation conditions. Analyses of sedimentological data collected by 20th and 21st century scientific surveys reveal dramatic shifts in Neva Bay sedimentation processes over the last three centuries. The western part of Neva Bay has transitioned from a sanddominated system to one of mud accumulation with the aerial extent of mud deposition expanding significantly during the 20th century. This inventory coupled with an understanding of primary natural and anthropogenic processes can help inform decision makers to support the overall ecological health of the bay.","PeriodicalId":55401,"journal":{"name":"Baltica","volume":"30 1","pages":"31-46"},"PeriodicalIF":0.7,"publicationDate":"2017-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44370531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Marine landscape mapping of the south-eastern part of the Baltic Sea (Russian sector)","authors":"D. Dorokhov, E. Dorokhova, V. Sivkov","doi":"10.5200/BALTICA.2017.30.02","DOIUrl":"https://doi.org/10.5200/BALTICA.2017.30.02","url":null,"abstract":"Five different kinds of broad-scale characterizations of the marine environment were used for marine bottom landscape mapping. In addition to three “primary” environmental parameters of the BALANCE project – sediment types, available light and near-bottom water salinity two more were also taken into account: near-bottom temperature and ice cover. Combination of these parameters allows for distinguishing 21 types of marine bottom landscapes. The dominant landscape type is located far beyond the surface photic zone and not influenced by the ice-cover. It is characterized by mud sediment type, salinity of 11–18 psu and deep low variable relatively cold near bottom waters (4–8 оС) with ulterior seasonal variability. The most perspective marine landscape, from the point of view of nature conservation zones, is small area located in the Curonian Spit marine nearshore zone where bottom sediments are represented by the relict lagoon hard clays partly covered by sands. These clays are unique bottom oasis where the numbers of benthic organism species sharply increase in contrast to almost lifeless adjacent extensive sand areas.","PeriodicalId":55401,"journal":{"name":"Baltica","volume":"30 1","pages":"15-22"},"PeriodicalIF":0.7,"publicationDate":"2017-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48072107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"OBITUARY Farewell to Dr. Sci. Saulius Gulbinskas","authors":"I. Dailidienė, Leonora Živilė Gelumbauskaitė, A. Grigelis","doi":"10.5200/BALTICA.2016.29.14","DOIUrl":"https://doi.org/10.5200/BALTICA.2016.29.14","url":null,"abstract":"","PeriodicalId":55401,"journal":{"name":"Baltica","volume":"29 1","pages":"156-157"},"PeriodicalIF":0.7,"publicationDate":"2016-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70648117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of human activity on groundwater chemistry (Wielkopolska region, Poland)","authors":"K. Dragon","doi":"10.5200/BALTICA.2016.29.08","DOIUrl":"https://doi.org/10.5200/BALTICA.2016.29.08","url":null,"abstract":"The article identifies the effects of human activity on groundwater chemistry in the regional aquifer system located in the Wielkopolska region (western Poland). It was documented using statistical methods, that the main process influencing the groundwater chemistry is connected to contamination. The impact of contamination is evident in regions without sewers and where the aquitard is relative thin. Chloride and sulphatewere found most influenced by pollution from surface sources. Total hardness is also sensitive, but its behavior is controlled by geogenic processes as well. Factor analyses are a reliable tool for recognizing contamination’s impact on groundwater chemistry, especially for cases with a relatively low contamination level, when contamination is related to natural occurring water components. This research is important for implementing groundwater protection plans at the regional scale. These interpretations may be used to manage water resources better at the regional scale.","PeriodicalId":55401,"journal":{"name":"Baltica","volume":"29 1","pages":"79-92"},"PeriodicalIF":0.7,"publicationDate":"2016-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70648283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultramafic Varėna Suite in the Precambrian crystalline basement of the Southern Lithuania – implications for the origin","authors":"G. Motuza, Vaida Kirkliauskaitė","doi":"10.5200/BALTICA.2016.29.09","DOIUrl":"https://doi.org/10.5200/BALTICA.2016.29.09","url":null,"abstract":"The Varėna Suite comprises a set of ultramafic rocks: olivinic, pyroxenic, magnetitic, dolomitic, and apatite bearing rocks, which form complex bodies of few sq. km in the Precambrian crystalline basement near the Varėna town in Southern Lithuania. Occurrences of few mineral commodities are related to the Varėna Suite. Magnetitic rocks contain essential resources of high grade iron ores. Phlogopite, apatite, REE and Th mineralization is related to the Varėna Suite. The assessment of the potential for these commodities is primarily dependent on the origin of Varėna Suite, which is still disputed. The models of metasomatic (skarn), and igneous (layered intrusion) origin are proposed earlier. The article presents an overview and reinterpretation of the recent data on the Varėna Suite, its petrographic and geochemical characteristic, as well as the arguments for igneous origin of the Varėna Suite, as the polyphase intrusion with subsequent metasomatic alteration, with","PeriodicalId":55401,"journal":{"name":"Baltica","volume":"29 1","pages":"93-106"},"PeriodicalIF":0.7,"publicationDate":"2016-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70648326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}