IF 0.7 4区地球科学

Baltica Pub Date : 2019-08-01 DOI: 10.5200/BALTICA.2019.1.9

G. Skridlaitė, L. Siliauskas, S. Prušinskienė, B. Bagiński

{"title":"Petrography and mineral chemistry of the Varena Iron Ore deposit, southeastern Lithuania: implications for the evolution of carbonate and silicate rocks and ore mineralization","authors":"G. Skridlaitė, L. Siliauskas, S. Prušinskienė, B. Bagiński","doi":"10.5200/BALTICA.2019.1.9","DOIUrl":"https://doi.org/10.5200/BALTICA.2019.1.9","url":null,"abstract":"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.","PeriodicalId":55401,"journal":{"name":"Baltica","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48697109","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}

引用次数: 4

Pathway of the Baltica, from Yearbook to the International Journal on Geosciences 波罗的海之路，从年鉴到国际地球科学杂志

IF 0.7 4区地球科学

Baltica Pub Date : 2019-08-01 DOI: 10.5200/baltica.2019.1.1

A. Grigelis

引用次数: 0

Oil pollution and geochemical hydrocarbon origin markers in sediments of the Curonian Lagoon and the Nemunas River Delta 库尔纪潟湖和内穆纳斯河三角洲沉积物中的石油污染与地球化学烃源标志

IF 0.7 4区地球科学

Baltica Pub Date : 2019-08-01 DOI: 10.5200/baltica.2019.1.3

R. Stakėnienė, K. Jokšas, R. Zinkutė, E. Raudonytė-Svirbutavičienė

引用次数: 0

Seismic shocks, periglacial conditions and glaciotectonics as causes of the deformation of a Pleistocene meandering river succession in central Lithuania 立陶宛中部更新世蜿蜒河流序列变形的地震冲击、冰缘条件和冰川构造

IF 0.7 4区地球科学

Baltica Pub Date : 2019-08-01 DOI: 10.5200/baltica.2019.1.6

M. Pisarska‐Jamroży, Szymon Belzyt, A. Bitinas, Asta Jusienė, B. Woronko

引用次数: 15

Baltica

IF 0.7 4区地球科学

Baltica Pub Date : 2019-08-01 DOI: 10.5200/baltica

引用次数: 3

Pedogenesis of a Retisol with fragipan in Karelia in the context of the Holocene landscapeevolution 全新世景观演化背景下卡累利阿fragipan Retisol的成子作用

IF 0.7 4区地球科学

Baltica Pub Date : 2019-01-15 DOI: 10.5200/BALTICA.2018.31.13

L. Pogosyan, S. Sedov, T. Pi-Puig, P. Ryazantsev, A. Rodionov, A. Yudina, P. Krasilnikov

{"title":"Pedogenesis of a Retisol with fragipan in Karelia in the context of the Holocene landscape\u0000evolution","authors":"L. Pogosyan, S. Sedov, T. Pi-Puig, P. Ryazantsev, A. Rodionov, A. Yudina, P. Krasilnikov","doi":"10.5200/BALTICA.2018.31.13","DOIUrl":"https://doi.org/10.5200/BALTICA.2018.31.13","url":null,"abstract":"Fragipan is a compacted but non-cemented subsurface horizon, considered as a pedogenic horizon, but the\u0000mechanism of its formation is not well understood. The main hydro-consolidation hypothesis involves a collapse of soil\u0000structure when it is loaded and wet, resulting a reorganisation of pore space. Soils with fragipan never have been marked\u0000in Russian soil maps. In the South Karelia, located in Eastern Fennoscandia (34.50921 E and 61.33186 N, 110 m asl)\u0000we studied a soil profile of Albic Fragic Retisol (Cutanic), developed in the glacial till of Last Glaciation with flat subhorizontal\u0000topography under an aspen-spruce forest. The aim of this study was to demonstrate how the fragic horizon was\u0000formed in the Retisol located in South Karelia. Observations were made in each soil horizon using micromorphological\u0000method, particle size analysis and the study of mineralogical composition of clay fraction by X-ray diffraction. The analysis\u0000of the morphological description combined with the laboratory data have led us to the conclusion that the consolidation\u0000of the fragipan occurred after the textural differentiation of the profile, following the Atlantic Optimum, and does not\u0000depend on the presence of swelling clay minerals. The well-developed argic horizon was probably formed around 6000\u0000years ago, under climatic conditions more favourable for clay illuviation than in present time. Fragipan is supposed to be\u0000developed during the Sub-Boreal cooling.","PeriodicalId":55401,"journal":{"name":"Baltica","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43294738","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}

引用次数: 3

Numerical modelling of vertical borehole heat exchangers performance under LithuanianQuaternary conditions 立陶宛第四纪条件下垂直井眼换热器性能的数值模拟

IF 0.7 4区地球科学

Baltica Pub Date : 2019-01-15 DOI: 10.5200/BALTICA.2018.31.14

Audrius Indriulionis, Žygimantas Palaitis, P. Šinkūnas, R. Mokrik

{"title":"Numerical modelling of vertical borehole heat exchangers performance under Lithuanian\u0000Quaternary conditions","authors":"Audrius Indriulionis, Žygimantas Palaitis, P. Šinkūnas, R. Mokrik","doi":"10.5200/BALTICA.2018.31.14","DOIUrl":"https://doi.org/10.5200/BALTICA.2018.31.14","url":null,"abstract":"The vertical borehole heat exchangers were surrounded by the heterogeneous multilayered geological environment\u0000and groundwater flow that affected the performance of borehole plants. In this paper, the field investigation of vertical\u0000borehole ground heat exchangers in capital city Vilnius (Visoriai), Lithuania is presented. The numerical heat transfer\u0000model considering seven different geological strata was developed using the cylindrical heat sink model for vertical\u0000borehole inside by solving the soil mass and heat transfer equations with groundwater flow. The numerical multilayered\u0000ground vertical borehole heat transfer model was calculated and validated by in-situ thermal response test data. The numerical\u0000model results were also compared with the homogeneous finite difference model expressed by the temperature\u0000response functions (well known as “g-functions”). The practical realization of g-functions was designed in the Earth\u0000Energy Designer as a practical tool for geoengineers designing the vertical borehole plants. The temperature profiles at\u0000borehole wall at different heating times were presented and explored together with relative errors. The numerical model\u0000will be used as a practical tool for the Lithuanian Geological Survey under the Ministry of Environment to estimate the\u0000underground conditions for the consumption of shallow geothermal energy.","PeriodicalId":55401,"journal":{"name":"Baltica","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47182453","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}

引用次数: 0

Severe floods in Nemunas River Delta Nemunas河三角洲发生严重洪灾

IF 0.7 4区地球科学

Baltica Pub Date : 2019-01-15 DOI: 10.5200/BALTICA.2018.31.09

Gintaras Valiuškevičius, E. Stonevičius, G. Stankunavicius, Janina Brastovickytė-Stankevič

{"title":"Severe floods in Nemunas River Delta","authors":"Gintaras Valiuškevičius, E. Stonevičius, G. Stankunavicius, Janina Brastovickytė-Stankevič","doi":"10.5200/BALTICA.2018.31.09","DOIUrl":"https://doi.org/10.5200/BALTICA.2018.31.09","url":null,"abstract":"The river delta regions are usually most vulnerable to flooding due to small changes in terrain elevation and\u0000river – sea interaction. The trends of increased frequency of flooding and an increased duration of the high water events\u0000are evident in many regions. In this study, we analyse the most extreme (severe) flood events in the Nemunas Delta region\u0000of Lithuania. The study focuses on the causes of floods and their changes over 1926–2016. Analysing specific case studies\u0000and comparing them with related studies of other researchers, we present an original interpretation of the variability of\u0000flood parameters. The aim of the study is to demonstrate that the analysis of flood events must be based on the identification\u0000of the drivers of individual floods. This is especially true for the lower reaches and the delta regions of rivers situated\u0000within the North European Plain. Historically, an intense melting of snow appeared to be the main cause of severe flooding\u0000in this region. The results of this study, however, show that the situation has rapidly changed over the last 30 years and\u0000large areas can be flooded even if the snow water equivalent over the whole basin is relatively low.","PeriodicalId":55401,"journal":{"name":"Baltica","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47128320","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}

引用次数: 5

The supply of total nitrogen and total phosphorus from small urban catchmentsinto the Gulf of Gdańsk 从小型城市集水区向格但斯克湾供应的总氮和总磷

IF 0.7 4区地球科学

Baltica Pub Date : 2019-01-15 DOI: 10.5200/BALTICA.2018.31.15

R. Cieśliński, A. Olszewska, Ł. Pietruszyński, M. Budzisz, Katarzyna Jereczek-Korzeniewska, Agata Ossowska

{"title":"The supply of total nitrogen and total phosphorus from small urban catchments\u0000into the Gulf of Gdańsk","authors":"R. Cieśliński, A. Olszewska, Ł. Pietruszyński, M. Budzisz, Katarzyna Jereczek-Korzeniewska, Agata Ossowska","doi":"10.5200/BALTICA.2018.31.15","DOIUrl":"https://doi.org/10.5200/BALTICA.2018.31.15","url":null,"abstract":"The main goal of work was to quantify the nitrogen and phosphorus loads transported by small streams to the\u0000Gulf of Gdańsk. The research aims to determine wastewater release volumes over time, instead of focusing only on spatial\u0000distributions. Another aim is to identify the main determinants potentially affecting water quality in rivers flowing across\u0000the city of Sopot. The study area consists of six small river catchments located in the city of Sopot, each with an open flow\u0000channel, which lies along the bay. Studies were conducted 12 times per year in the period from March 2014 to February\u00002015. Laboratory analyses were performed to determine the concentration of both total nitrogen and total phosphorus. In\u0000order to calculate pollutant loads, discharge was also measured in each of studied rivers. Conducted research has shown\u0000that all analyzed streams were characterized by low total nitrogen and total phosphorus concentrations. The mean annual\u0000values ranged from 0.60 to 1.28 mg·dm-3 in case of total nitrogen and from 0.066 to 0.100 mg·dm-3 in case of total phosphorus.\u0000In 2012, the total nitrogen load from Poland to the Baltic Sea was 210.768.000 kg N while the total phosphorus\u0000load was 15.269.000 kg P, which means that streams analyzed in this paper supplied barely 0.002 % of the biogenic load\u0000supplied to the Baltic Sea by Poland as a whole.","PeriodicalId":55401,"journal":{"name":"Baltica","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42237357","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}

引用次数: 0

Spheroidal carbonaceous particles in cryoconite sediment on the Russell glacier, SouthwestGreenland 格陵兰岛西南部拉塞尔冰川冰锥岩沉积物中的球状碳质颗粒

IF 0.7 4区地球科学

Baltica Pub Date : 2019-01-15 DOI: 10.5200/BALTICA.2018.31.11

N. Stivrins, K. Lamsters, J. Karušs, M. Krievāns, Agnis Rečs

{"title":"Spheroidal carbonaceous particles in cryoconite sediment on the Russell glacier, Southwest\u0000Greenland","authors":"N. Stivrins, K. Lamsters, J. Karušs, M. Krievāns, Agnis Rečs","doi":"10.5200/BALTICA.2018.31.11","DOIUrl":"https://doi.org/10.5200/BALTICA.2018.31.11","url":null,"abstract":"In this study, we analysed the organic and inorganic content of the cryoconite holes along the altitudinal gradient\u0000at the lower elevations of the Russell glacier ablation zone in Southwest Greenland. We specifically focus on less studied\u0000industrial microscopic spheroidal carbonaceous particles (SCP; part of black carbon) to get more insights about their\u0000accumulation patterns on the glacier surface. We found no clear SCP distribution pattern, including concentration values.\u0000This outcome underlines the complexity of the ice margin zone and draws attention for further research on this topic with\u0000the inclusion of multiyear evaluation of SCP concentration at the even wider area that could possibly give results that can\u0000be compared to the emission source and long-way air pollution validation. In addition, our results indicate that during\u0000the summer of 2016, algae composition was formed of both green algae (Chlamydomonadaceae, Mesotaeniaceae) and\u0000cyanobacteria (Oscillatoriaceae). Green algae had a larger relative proportion than cyanobacteria in the cryoconite holes\u0000throughout the studied gradient.","PeriodicalId":55401,"journal":{"name":"Baltica","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47475916","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}

引用次数: 4

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