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Wyświetlanie 1-15 z 20
Tytuł:
Fractal analysis of tropical karst relief : South China Karst case study
Autorzy:
Andreychouk, Viacheslav
Blachowicz, Tomasz
Dłużewski, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/2058635.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
fractal dimension
cover factor
tropical karst
South China Karst
Opis:
Areas of tropical karst create the most spectacular earth landscapes from a geomorphological perspective. These areas are characterized by a variety of specific forms resulting from the long-term karst-erosion dismemberment of terrains in favourable humid tropical conditions. Tropical karst areas are extremely diverse from a geomorphological point of view both in terms of local conditions of development and developmental stages. Among the many types of karst relief, the following two basic types can be recognized: fenglin (tower karst) and fengcong (cone karst). The other types can be treated as a mixture of these two basic types. To find potential quantitative rates characterizing the two main types, as well as the mixed types, we calculated fractal dimensions and cover factors of 17 areas located within the two well-known regions of South China Karst - Guilin and Huanjiang. The calculations show that the numerical characteristics obtained, especially the cover factor parameter, can be useful as complementary tools in the recognition and typology of tropical karst relief and landscapes.
Źródło:
Geological Quarterly; 2019, 63, 4; 729--740
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geoindicators of changing landscapes-an example of karst development in North Lithuania
Autorzy:
Satkunas, J.
Taminskas, J.
Dilys, K.
Powiązania:
https://bibliotekanauki.pl/articles/2059127.pdf
Data publikacji:
2006
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
geoindicators
sulphate karst
sinkholes
karst denudation
Opis:
During the last two decades of the 20th century and first years of the 21st century more intensive karst processes have been witnessed in North Lithuania. The intensity of the karst process is visible as new sinkholes appearing that severely damage crops, constructions and communication systems. Explanation and forecast of these hazardous phenomena requires knowledge based on systematic monitoring data and adequate interpretation with identification of relevant geoindicators of the intensive sulphate karst processes which are of primary significance for environmental planning and management of the region. Two geoindicators, gypsum chemical denudation and the intensity of appearance of new sinkholes, were selected for monitoring of karst processes in North Lithuania. Chemical denudation has been measured since 1964 in this region. These geoindicators show that since 1978 the intensity of karst denudation has increased by 30%, with more frequent formation of sinkholes. A correlation of this phenomenon with climate change — increasing air temperature and decreasing of the duration of seasonally frozen ground — is proposed and discussed in this paper.
Źródło:
Geological Quarterly; 2006, 50, 4; 457-464
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Karst relief of the Mali me Gropa Massif, central Albania
Autorzy:
Andreychouk, Viacheslav
Eftimi, Romeo
Nita, Jerzy
Klimchouk, Alexander
Powiązania:
https://bibliotekanauki.pl/articles/2127365.pdf
Data publikacji:
2022
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
karst geomorphology
mountain karst
central Albania
Mali me Gropa massif
Opis:
The mid-altitude mountain massif of Mali me Gropa is located in the central part of Albania, rises to an altitude of 1500–1800 m a.s.l., is composed mostly of Mesozoic limestone, and is characterized by extensive surface karst development. The karst relief is dominated by “doline” morphology including “polygonal” karst. Detailed geomorphological analysis of the western part of the Mali me Gropa massif (so-called Western Massif) by means of GIS methods is used to determine and explain the morphometric and morphological diversity of the area’s topography. Based on a homogeneity criterion, a number of geomorphological units with specific kinds of karst relief have been distinguished within the massif. The differences in karst sculpture concern the size (diameter) of dolines and depressions, their depth, shape and symmetry, orientation, density of occurrence and spatial pattern, which provide the basis for distinguishing geomorphological units. The spatial differentiation of the karst relief is explained by the influence of factors which are evolutionary (geological and geomorphological evolution of the massif), hypsometric (altitude difference of terrains) and geomorphologic-structural (inclination of the slopes and layers). The relatively poor expression of open karst conduits (i.e. caves and vertical shafts) on the surface of the massif may result from the relative immaturity of the epikarst zone, the widespread occurrence of residual cover on the plateau, and the accumulation of large amounts of clay material in dolines and depressions. Detailed hydrogeological studies show, however, high karst permeability and dominance of conduit flow. Considering the high geomorphological landscape and ecological value of the area, it should be granted the status of a nature reserve or national park. Geomorphological and karstological research within the massif should be continued as it represents a type of karst found also in other parts of Albania. This type of karst area is of great economic (groundwater reserves) and natural protection (environmental) importance.
Źródło:
Geological Quarterly; 2022, 66, 1; art. no. 6
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fossil karst in the Jurassic of the Kościuszko Mound in Kraków (southern Poland) : discussion
Autorzy:
Felisiak, I.
Powiązania:
https://bibliotekanauki.pl/articles/2060187.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
fossil karst
southern Poland
Jurassic
Źródło:
Geological Quarterly; 2016, 60, 1; 252--255
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Circulation in present-day karst systems sourcing the vaucluse springs in the Polish Tatra Mts., based on tracer methods and limnimetric observations
Autorzy:
Barczyk, G.
Powiązania:
https://bibliotekanauki.pl/articles/2059632.pdf
Data publikacji:
2003
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Tatra Mts.
karst
vaucluse springs
karst systems
tracer methods
stationary observations
Opis:
The paper reviews research into karst system recharging the vaucluse springs in the Tatra Mts. Investigations of present-day karst systems are carried out directly with tracer methods, as well as based on interpretations of stationary observations in springs. Direct methods lead to the determination of groundwater migration routes and their rates, with further information from interpretations of results obtained from monitoring the vaucluse springs of the area.
Źródło:
Geological Quarterly; 2003, 47, 1; 97-106
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variability in chemical composition of waters in the Zoloushka gypsum cave (Ukraine-Moldova) as a consequence of anthropogenic degradation of a karst aquifer
Autorzy:
Andreychouk, Viacheslav
Różkowski, Jacek
Jóźwiak, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2060096.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
karst aquifer degradation
gypsum karst
water geochemistry
Zoloushka Cave
Opis:
The Zoloushka Cave, with passages >90 km long and a volume of ~0.65 million m3, is among the largest gypsum caves in the world. The cave was opened in the course of gypsum excavation in a quarry in the village of Criva (Moldova) located just near the border with Ukraine. During the quarry exploitation, with the accompanying pumping of water, the groundwater table was lowered to the bottom part of the gypsum layer. As a result of the pumping, the karst aquifer within the cave labyrinth was fragmented into separate underground reservoirs controlled by the morphology of the karst system and its content of clay deposits. Currently, there are several dozen lakes in the cave with a varied hydrodynamic regime (relict lakes, lakes with direct and indirect hydraulic connection with the aquifer). Research was carried out in February 2020 to determine the degree of, and reasons for, the hydrogeochemical diversity of 10 selected lakes of various hydrodynamic types present in the cave. The degree of variability of the hydrogeochemical parameters of these lakes was found to depend on a number of factors, mainly: the hydrodynamic type of the cave lake resulting from the degree of its hydraulic connection with the aquifer; the geochemical environment of the lake; and anthropogenic influence. The autonomizing role of these factors is the modification (within individual lakes) of the hydrogeochemical context of the transit waters flowing through the cave system to the quarry.
Źródło:
Geological Quarterly; 2021, 65, 3; 65: 41
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recent sinkholes in an area of intensive karst development in northern Lithuania
Autorzy:
Bucevičiuté, S.
Mikulénas, V.
Powiązania:
https://bibliotekanauki.pl/articles/2059433.pdf
Data publikacji:
2000
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Lithuania
karst
sinkhole
cavity
gypsum
engineering geology
Opis:
The karst of northern Lithuania is developed in gypsiferous layers of the Pasvalys and Nemunelis beds of the Tatula Formation of the Upper Devonian (Frasnian) stage. The new sinkholes formed during the last ten years in around Birzai and Pasvalys indicate recent karst activity. 84 recent sinkholes appeared around the villages of Karajimiskis, Mantagailiskis in the Birzai district from 1995 to 1999. The three biggest sinkholes occur in Pasvalys. Karst processes and phenomena are particularly dangerous in urban areas. The sudden appearance of sinkholes and ground subsidence have often caused building damage. New sinkholes indicate a very sensitive engineering geological environment.
Źródło:
Geological Quarterly; 2000, 44, 4; 371-375
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The first “osteolepiform” tetrapodomorph (Sarcopterygii) from the Paleozoic sequences of the Moravian Karst (Czech Republic)
Autorzy:
Poukarová, H.
Weiner, T.
Powiązania:
https://bibliotekanauki.pl/articles/2059930.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
tetrapodomorpha
osteolepiformes
cosmine
Famennian
Moravo-Silesian Basin
Moravian Karst
Opis:
The first tetrapodomorph specimen from the Palaeozoic sequences of the Moravian Karst (Moravo-Silesian Basin, Bohemian Massif, Czech Republic) is described. The well preserved, cosmine-covered lateral extrascapular bone comes from the Upper Devonian (Famennian) hemipelagic Křtiny Limestone of the Líšeň Formation. The affinity to the “osteolepiforms” is inferred from the cosmine histology and morphological features of the bone. Assignment to the Megalichthyiformes seems most probable. The associated fauna, e.g., clymenids, orthocone nautiloids, thin shelled bivalves, trilobites and crinoids, clearly demonstrate a marine environment.
Źródło:
Geological Quarterly; 2016, 60, 3; 737--745
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geomorphology and hydrogeology of an exposed evaporite dome: the Dumre karst area, Central Albania
Autorzy:
Andreychouk, Viacheslav
Eftimi, Romeo
Nita, Jerzy
Klimchouk, Alexander
Powiązania:
https://bibliotekanauki.pl/articles/2058685.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Albania
gypsum karst
Dumre area
chemical denudation
Opis:
The Dumre area, located in Central Albania, is distinguished by a landscape whose main features consist of low altitude, mosaic and irregular relief, and the presence of a large number of depressions with lakes. These features result from karst development related to the presence of a tectonically affected dome of Triassic evaporite rocks, mainly gypsum. Gypsum karstification has operated since the Pliocene, and the present-day geomorphological appearance of the area indicates an advanced, mature stage of karst development. Signs of this maturity include the widespread occurrence of large depressions, many of which are water-filled, forming lakes, the occasional presence of gypsum hills in the form of monadnocks, a thick “coating” of residual sediments largely isolating the karstic gypsum substrate from precipitation and surface waters, and the fragmentary pattern of a degraded river network. The karst character of the relief is largely “camouflaged” by clastic terrigenous and residual deposits of considerable thickness which cover the gypsum and form a caprock. At the present stage, the caprock is being strongly reshaped and eroded. Chemical analyses show a mean dissolved gypsum content of 1.9 g/l and mean dissolved NaCl content of 0.4 g/l. The mean flow rate of subaqueous springs is calculated as 1.84 m3. The density of gypsum is 2.3, and that of rock salt is 2.17, thus the total volume of gypsum dissolved each year is 47,420 m3 and of rock salt 10,680 m3, making a total volume of dissolved material released by the subaqueous springs in one year of 58,100 m3. This corresponds to a cubic void of side length 38.7 m.
Źródło:
Geological Quarterly; 2021, 65, 4; 139--157
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fossil karst in the Jurassic of Kościuszko Mound in Kraków (southern Poland)
Autorzy:
Wójcik, A.
Garecka, M.
Olszewska, B.
Wódka, M.
Powiązania:
https://bibliotekanauki.pl/articles/2059809.pdf
Data publikacji:
2015
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
South Poland
Cracow Upland
karst
Jurassic
Cretaceous
Miocene
calcareous nannofossils
foraminifers
Opis:
Study of four boreholes (each 100 mdeep) drilled in the St. Bronisława Hill (a part of the horst of the Wolski Forest, Kraków area) indicated that within the Oxfordian limestone occur claystones with calcareous rubble (detritus), filling the fossil karst forms. The claystones, that in some cases show planar stratification, contain assemblages of Late Cretaceous (Campanian–Maastrichtian) foraminifers. The Middle Miocene planar laminated limestones have also been found in cavities formed in the Middle Oxfordian limestones. Miocene deposits of this type, filling the fossil karst, were not previously known from the area of Kraków. Both the Upper Cretaceous and the Middle Miocene deposits document probably marine sedimentation that resulted in the filling of the karst system. This type of karst was probably formed before the transgression of the Upper Cretaceous sea and the subsequently before the transgression of the Middle Miocene sea into the area of present horst of the Wolski Forest.
Źródło:
Geological Quarterly; 2015, 59, 1; 61--70
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of intrinsic vulnerability of an Upper Jurassic karst-fissured aquifer in the Jura Krakowska (southern Poland) to anthropogenic pollution using the DRASTIC method
Autorzy:
Różkowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2059477.pdf
Data publikacji:
2007
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Silesian-Cracow Monocline
karst-fissured waters
vulnerability to pollution
DRASTIC
Opis:
This paper demonstrates the evaluation of in trinsic vulnerability of karst-fissured waters in an Upper Jurassic aquifer by applying modified DRASTIC method. The area investigated is the Jura Krakowska (South Poland) - an area of upland merokarst (or relictkarst), where the Upper Jurassic aquifer is mainly unconfined. The method applied is a combination of a simulation model of the ground water aquifer (factors: netre charge, hydraulic conductivity, ground wa ter flow velocity in the aquifer) and a geographical in formation system - GIS model (depth of ground water table, lithology of vadosezone, thickness of Upper Jurassic aquifer), and additionally a soil factor was taken into account. In the area of the Jura Krakowska, 5 classes of intrinsic vulnerability to pollution were distinguished according to the values of vulnerability factors. These classes range from extremely high to low vulnerability (IP 200-50). Based on the synthetic map of vulnerability it emerges that high vulnerability indices cover 54% of the area studied while medium and low vulnerability indices cover 46% of this area. The modified DRASTIC method presented seems to be a useful tool to evaluate the intrinsic vulnerability of karst-fis sured aquifers of "Torcal" type with a scattered system of recharge and discharge, and a thick vadosezone of variable permeability. This is consistent with the method developed with European programme COST ACTION 620. All rating methods recommended for karst have limitations, there fore the method applied is constantly updated. Many of them are particularly use ful for areas of bare karst, mountain systems of "Aliou" type and in ar eas of complete karst develop ment (holokarst).
Źródło:
Geological Quarterly; 2007, 51, 1; 17-26
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cryogenic carbonates and cryogenic speleothem damage in the Za Hájovnou Cave (Javoříčko Karst, Czech Republic)
Autorzy:
Žak, K.
Lipták, V.
Filippi, M.
Orvošová, M.
Hercman, H.
Matouškova, Š.
Powiązania:
https://bibliotekanauki.pl/articles/2060084.pdf
Data publikacji:
2018
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
cryogenic cave carbonates
speleothem damage
Javoříčko Karst
U-series dating
Opis:
A new locality of coarse-grained cryogenic cave carbonates has been found in the Za Hájovnou Cave in Javoříčko Karst in Central Moravia, Czech Republic. Crystals and crystal aggregates, usually up to 15 mm in size, form typical loose accumulations on the surface of large fallen limestone blocks and clays covering the bottoms of several cave chambers distant from the cave entrance. The cryogenic origin of the carbonates is supported by their mode of occurrence, specific crystal and aggregate morphology, and C and O stable isotope data. U-series dating of one sample of cryogenic carbonate (age 29.5 ±0.1 ka) indicated that a period of karst water freezing occurred in marine isotope stage (MIS) 3, within the Weichselian. The cave also hosts numerous examples of speleothem damage. As shown in this paper, some of these are clearly connected with freezing conditions and cave ice action.
Źródło:
Geological Quarterly; 2018, 62, 4; 829--839
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Castoridae (Rodentia) from the Villafranchian site of Węże 2 in southern Poland
Autorzy:
Czernielewski, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2185979.pdf
Data publikacji:
2022
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Villafranchian
rodents
beavers
Węże
karst
Opis:
Several isolated teeth and jaw fragments of beavers (Rodentia: Castoridae), discovered at the Villafranchian (MN 16b?) site of Węże 2 in southern Poland, are attributable to two species: Dipoides ex gr. problematicus-sigmodus and Trogontherium (Euroxenomys) minus. The genus Dipoides and the species Trogontherium (Euroxenomys) minus have not previously been reported from Poland. Their presence at the Węże 2 site suggests that these lesser-known and extinct representatives of the Castoridae were adapted to similar conditions as the modern species (Castor fiber and C. canadensis).
Źródło:
Geological Quarterly; 2022, 66, 2; art. no. 18
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gliridae (Rodentia) from the Villafranchian site of Węże 2 in southern Poland
Autorzy:
Czernielewski, Michał
Powiązania:
https://bibliotekanauki.pl/articles/2058683.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Villafranchian
rodents
dormice
Węże
karst
Opis:
A fossil assemblage of dormice (Rodentia: Gliridae) was uncovered at the (Lower?) Villafranchian site of Węże 2 in southern Poland. Based on morphometric criteria, the diagnostic M1 and m1 speci mens are assignable to Glis mi nor and Glis sackdillingensis, two species which differ only in the dimensions of their cheek teeth. The presence of dormice at Węże 2 implies that the fossil assemblage of this site represents an at least partly wooded environment. The enamel structure in the glirids from Węże 2 is formed predomi nantly by radial enamel. A thin layer of lamellar enamel, occurring close to the enamel-dentine junction, may be present. Such a type of enamel structure is typical of the Myomorpha, the clade of rodents encompassing the Muroidea (the mouse-like rodents) and Gliridae.
Źródło:
Geological Quarterly; 2021, 65, 4; 28--39
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New data on pre-Eocene karst in the Tatra Mountains, Central Carpathians, Poland
Autorzy:
Gradziński, M.
Jach, R.
Hercman, H.
Powiązania:
https://bibliotekanauki.pl/articles/2059838.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
cave deposits
speleothems
weathering
Palaeogene
Opis:
Sparry limestone, ferruginous muddy limestone and limestone breccia have been found in the Western Tatra Mts. They occur within Jurassic rocks of the Choč Nappe just below red conglomerates of probable Eocene age. The deposits found bear strong resemblance to the infill of subterranean karst forms. They differ significantly from Quaternary karst deposits of the Tatra Mts. The δ18O values of spelean carbonates suggest crystallisation at relatively high temperatures (over 20°C) whereas their relatively negative δ13C values imply the presence of soil-derived CO2 linked with vegetation dominated by C3 pathway plants. The karst forms and their infill were formed before the Eocene transgression, which shows unequivocally that the Tatra Mts. were subjected to karstification at that time.
Źródło:
Geological Quarterly; 2016, 60, 2; 291-300
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 20

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