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Tytuł:
The position and age of flysch deposits in the Crimean Mountains (Southern Ukraine)
Autorzy:
Oszczypko, N.
Ślączka, A.
Bubniak, I.
Olszewska, B.
Garecka, M.
Powiązania:
https://bibliotekanauki.pl/articles/2060566.pdf
Data publikacji:
2017
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Ukraine
Crimean Mts.
stratigraphy
micropalaeontology
flysch
Opis:
The Crimean Mountains (CM) are regarded as part of the Alpine-Himalaya orogenic belt related to the collision of the Eurasian and African plates. Our research in the CM has allowed confirming the existence of at least two flysch formations of different ages: the Taurida Flysch Formation (Upper Triassic/Lower–? Middle Jurassic) and the Sudak Formation (uppermost Jurassic/Lower Cretaceous) in the western and eastern sectors of the CM, respectively. After the Middle Jurassic volcanism, the freshwater claystones with coal-bearing intercalations, as well as local alluvial fan conglomerates were deposited. Then, following the Oxfordian/Kimmeridgian marine transgression, three separated Tithonian/Berriasian carbonate platforms developed: Baydarska, Chatyr-Dag and Demerji/Karabi. At the turn of the Late Jurassic, the deep-water Sudak Basin (eastern sector of the CM) began to develop in the eastern periphery of the Demerji/Karabi carbonate platform. This basin, dominated by turbiditic deposition, was probably connected with the Great Caucasus sedimentary system. Finally, distal flysch sedimentation in the Sudak Basin was followed by debris-flow deposits, with huge blocks of Upper Jurassic limestones. These blocks were derived from destruction of the Karabi carbonate platform. During the Berriasian/Valanginian, the eastern sector of the CM began to subside. As a result, both carbonate platforms (western CM) and the debris flow fans of the Sudak Basin (eastern CM) were overlain by marly shales and/or distal turbidites. This type of deposition lasted until the Aptian/Albian. In the post-Albian period, the Alushta-Salgir tectonic zone was transformed into a SE-dipping thrust fault with at least 10 km amplitude of overthrusting.
Źródło:
Geological Quarterly; 2017, 61, 4; 697--722
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Outline of Quaternary glaciations in the Tatra Mts. : their development, age and limits
Autorzy:
Lindner, L.
Dzierżek, J.
Marciniak, B.
Nitychoruk, J.
Powiązania:
https://bibliotekanauki.pl/articles/2058873.pdf
Data publikacji:
2003
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Tatra Mts.
Pleistocene
Holocene
glaciers stratigraphy
Opis:
Geomorphological and geological data collected over many years suggest at least eight episodes during which the Tatra Mts. were glaciated during the Quaternary. Evidence of glaciers can be found both in the Slovakian and Polish parts of the mountains as glaciofluvial deposits located at different altitudes, and in some cases also as terminal and lateral moraines. There are no moraines for the three oldest glaciations, Biber, Donau and Günz, maybe as a result of less intense development of glaciers. During the Mindel (Sanian 2) Glaciation the glaciers occuped a larger area in the High Tatra Mts. in comparison to the Western Tatra Mts., whereas during the succeeding younger pre-Riss (Liviecian) Glaciation their development was more restricted. A greater extent of the Tatra Mts. glaciers occurred again during the Riss I (Odranian) Glaciation, while they were less extensive during the Riss II (Wartanian) Glaciation. During the Würm (Vistulian) Glaciation the glaciers were surprisingly large. This might have resulted from many factors, including changes in atmospheric circulation responsible for the distribution of precipitation, as well as changes in the position of the permanent snow limit due to climatic changes and/or neotectonic movements. Glaciers finally retreated from the Tatra Mts. by the end of the pre-optimal part of the Holocene.
Źródło:
Geological Quarterly; 2003, 47, 3; 269-280
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial relationship in interaction between glacier and permafrost in different mountainous environments of high and mid latitudes, based on GPR research
Autorzy:
Dobinski, W.
Grabiec, M.
Gądek, B.
Powiązania:
https://bibliotekanauki.pl/articles/2058744.pdf
Data publikacji:
2011
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Scandinavia
Spitsbergen
Tatra Mts.
glacier - permafrost relationship
Opis:
Ground penetrating radar (GPR) surveys were conducted on both the glaciers and their forefields in the Tatra Mountains, Northern Scandinavia and on Spitsbergen – between the 49 degrees and 77 degrees latitudes. The results show that the glacial and periglacial environments interpenetrate. Permafrost is present in the glacier, and glacial ice may occur in the periglacial environment. What is common for both the environments is the perennial melting point surface, with the temperature close to 0°C. In the glacier it is the boundary of the cold-temperate transition surface and on the forefield – permafrost base.
Źródło:
Geological Quarterly; 2011, 55, 4; 375-388
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conodonts and foraminifera from the "Raibl Beds" (Carnian) of the Karavanke Mountains, Slovenia : stratigraphical and palaeobiological implications
Autorzy:
Kolar-Jurkovšek, T.
Jurkovšek, B.
Gaździcki, A.
Powiązania:
https://bibliotekanauki.pl/articles/2059708.pdf
Data publikacji:
2005
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Slovenia
Karavanke Mts.
Carnian
"Raibl Beds"
biostratigraphy
Opis:
Themicropalaeontology of the "Raibl Beds" of the Košuta Nappe in the western KaravankeMts., Slovenia, is described. The presence of the conodont apparatus of Nicoraella? budaensis Kozur and Mock is demonstrated and together with other fossils it confirms a Carnian age. A comparison of the Nicoraella skeletal apparatus with two other Triassic apparatuses is made. The benthic foraminifera Aulotortus sinuosus, A. tumidus, Prorakusia salaji, Pilamminella kuthani and Endothyra kuepperi are recognized. Their stratigraphical range corresponds to the foraminiferal Pilamminella kuthani Interval-Zone. Altogether the palaeontological content of an 85 m-thick section in the upper part of the "Raibl Beds" below Mt. Jepca is described. The diverse fossil content of this section contributes to the intercalibration of Upper Triassic conodont, foraminifer and dasyclad zonations.
Źródło:
Geological Quarterly; 2005, 49, 4; 429-438
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Groundwater ages and altitudes of recharge areas in the Polish Tatra Mts. as determined from 3H, d18O and d2H data
Autorzy:
Zuber, A.
Małecki, J.
Duliński, M.
Powiązania:
https://bibliotekanauki.pl/articles/2060203.pdf
Data publikacji:
2008
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Tatra Mts.
groundwater
environmental isotopes
tritium ages
Opis:
Large and medium karstic springs in the Polish Tatra Mts. occasion ally sampled during low flows exhibited little scatter of stable isotope composition and distinct differences between particular sampling sites. For extreme stable isotope values of four springs, the recharge altitudes were estimated by making use of topographic and geological maps. The altitude effect found in that way served for determining the recharge altitudes of other sampled sites. The altitude-effect gradients found in that way are -0.21‰/100 m and-1.45‰/100 m for delta exp.18 O and delta exp. 2 H, respectively. In general, large karstic springs (exsurgents) have the highest recharge altitudes whereas medium spring and deep wells are characterized by much lower altitudes. Tritium data interpreted with the aid of lumped parameter models yielded mean ages of ca. 3 years for low flows in large karstic springs, ca. 10 years for medium springs, and 50 to 100 years for deep wells, all with very wide age distributions. For four deep wells, the regional hydraulic conductivity estimated from tritium ages (0.8 ´ 10-6 m/s) is about 20 times lower than the geometric mean found from pumping tests (17 ´ -10–6 m/s) suggesting the existence of obstacles to regional flow.
Źródło:
Geological Quarterly; 2008, 52, 1; 71-71
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jurassic unconformities in the High-Tatric succession, Tatra Mountains, Poland
Autorzy:
Jezierska, A.
Łuczyński, P.
Powiązania:
https://bibliotekanauki.pl/articles/2060619.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
unconformities
Triassic
Jurassic
High-Tatric series
Tatra Mts.
Opis:
During the Triassic/Jurassic boundary interval and in the Jurassic, the Triassic carbonate platforms occupying the northern shelf of the Western Tethys were subjected to disintegration. Record of these processes in the Alpine-Carpathian area is incomplete and contains a number of stratigraphic gaps. In the High-Tatric succession of the Tatra Mountains (Central Western Carpathians) stratigraphic gaps expressed by unconformity surfaces occur between the Triassic and the Middle Jurassic. In particular areas, the Triassic is directly overlain by the Dudziniec Formation (Sinemurian-Bajocian), the Smolegowa Formation (Bajocian), the Krupianka Formation (Bathonian) or the Raptawicka Turnia Formation (Callovian-Hauterivian). The occurrence of Bajocian and Bathonian deposits is limited to isolated lenticular bodies or to infillings of neptunian dykes penetrating the Triassic. Spatial relations between particular Jurassic lithosomes and the occurrence of stratigraphic gaps between particular units allow discerning four main unconformities. In the stratigraphical order these are: base of the Dudziniec Format ion (erosional unconformity), base of the Smolegowa Formation (penacordance or parat conformity), base of the Krupianka Format ion (erosional unconformity) and base of the Raptawicka Turnia Formation (drowning unconformity). Following episodes of erosion modified the previously developed unconformity surfaces, which resulted in complex modern architecture of the Triassic/Jurassic contact, as well as between particular Jurassic formations.
Źródło:
Geological Quarterly; 2016, 60, 2; 273--290
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methodology and potential of image analysis and unconventional use of GIS tools in determining grain size distribution and fractal dimension : a case study of fault rocks in the Western Tatra Mts. (Western Carpathians, Poland)
Autorzy:
Kania, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/2058666.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
petrotectonics
image analysis
GIS
mylonites
cataclasites
Tatra Mts.
Opis:
A methodology of textural analyses based on image analysis is proposed and tested based on study of fault rock samples from the Tatra Mts., Poland. The procedure encompasses: (1) SEM-BSE imagery of thin sections; (2) image classification using the maximum likelihood method, performed with GIS software; (3) statistical analysis and fractal dimension (self-similarity) analysis. The results of this method are comparable to those obtained with methods involving specialized software. The proposed analytical procedure particularly improves qualitative observations with quantitative data on grain shape and size distribution. The potential of the method is shown, as an auxiliary tool in determining the nature of deformation processes: the role of high-temperature dynamic recrystallization processes is recorded using grain shape indicators, whilst the switch from ductile to brittle conditions is reflected by the grain size distribution pattern.
Źródło:
Geological Quarterly; 2019, 63, 2; 345--358
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Middle Triassic syntectonic sedimentation and volcanic influence in the central part of the External Dinarides, Croatia (Velebit Mts.)
Autorzy:
Smirčić, Duje
Aljinović, Dunja
Barudžija, Uroš
Kolar-Jurkovšek, Tea
Powiązania:
https://bibliotekanauki.pl/articles/2058556.pdf
Data publikacji:
2020
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
External Dinarides
Velebit Mts.
syntectonic deposition
Middle Triassic
volcaniclastics
facies
Opis:
Middle Triassic deposits in the Velebit Mts. of the External Dinarides in Croatia show strong differentiation of sedimentary environments and facies. In the area of Donje Pazarište, a 90 metre thick section includes six different facies, each with its specific genetic characteristics (Flysch-like Facies; Carbonate Shale Facies; Pyroclastic Density Current Facies; Platy Limestone with Pyroclastics Facies; Limestone Breccia Facies and Slumped Limestones with Pyroclastics and Chert Facies). In the same area, in the nearby Top of Donje Pazarište section, a Pyroclastic Flow Facies was defined, and this was also recognized ~15 km to south-east, in the area of Brušane Village, in the foothills of Vinac. Throughout the area and section investigated, the effects of intense tectonic and volcanic activity can be traced. The pronounced differences in the facies determined facies are interpreted as consequences of syntectonic and volcanically influenced sedimentation in a graben/half-graben depositional system.
Źródło:
Geological Quarterly; 2020, 64, 1; 220--239
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molluscan assemblages in Late Holocene tufa cones in the Pieniny Mountains (southern Poland)
Autorzy:
Alexandrowicz, W. P.
Powiązania:
https://bibliotekanauki.pl/articles/2059741.pdf
Data publikacji:
2014
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
calcareous tufa
molluscan assemblages
historic period
Pieniny Mts.
South Poland
Opis:
Limestone rock walls of various inclination form a favourable substrate for the deposition of calcareous tufas that form cone-shaped structures located at the foot of slopes or fill niches within them. Such carbonate deposits usually contain rich and diversified molluscan assemblages, whose composition and structure closely correspond to the ambient environmental conditions in the immediate vicinity. The study of the Pieniny Mountains area revealed 10 sites with such deposits. The identified malacofouna was subjected to detailed analysis. It enabled identification of three types of faunistic assemblages (Bythinella austriaca assemblage, Pyramidula pusilla assemblage, and a shade-loving species assemblage), which are related to the conditions prevailing during the deposition. Tufa cones found in the Pieniny Mountains represent the historic period (Late Holocene). The deposits provide a record of two climatic phases: warmer and colder. The former (Medieval Warm Period) involved the intensified deposition of carbonate material and the rapid growth of tufa cones. The latter – the Little Ice Age – entailed the slow degradation of cones and slower sedimentation of tufas, while the intensified physical weathering led to the increase in the clast material proportion (sharp-edged limestone fragments). Tufas accumulated in the zone unaffected by high anthropogenic pressure and thus represent a record of natural environmental changes during the historic period
Źródło:
Geological Quarterly; 2014, 58, 2; 269--280
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Zadnie Kamienne "ravenous" shear zone (High-Tatric Nappe) - conditions of deformation
Autorzy:
Jurewicz, E.
Słaby, E.
Powiązania:
https://bibliotekanauki.pl/articles/2058790.pdf
Data publikacji:
2004
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Tatra Mts.
Carpathians
shear zone
pressure solution
feldspar growth
geothermometers
Opis:
The Zadnie Kamienne shear zone is a high-angle Riedel type shear zone (R'), exhibiting an antithetic sense of displacement, which may have developed synchronously with the nappe-thrusting of the Giewont Unit (High-Tatric Nappe). The amount of displacement along this zone is very low and does not explain the very intense deformation, which is of the same character as that at the base of the Giewont Unit (mylonitization, stylolitization and vein forming). The explanation of this phenomenon lies in the multiple activity of this zone, the change of the direction of movement and the important role of pressure solution in hydrothermal conditions responsible for dissolution creep, mass loss and stress relaxation. This kind of shear can be referred to as a "ravenous" shear zone. Neo-forming minerals accompanying these processes were applied as a temperature gauge. Simultaneous growth of albite and adularia indicates a temperature of about 350 degrees C. Chlorites accompanying them occur in two thermal episodes, the first of which indicating a similar temperature (292-357 C).
Źródło:
Geological Quarterly; 2004, 48, 4; 371--382
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Landslide susceptibility mapping in the Beskid Niski Mts., Western Carpathians (Dukla commune, Poland)
Autorzy:
Bronowski, B.
Chybiorz, R.
Jura, D.
Powiązania:
https://bibliotekanauki.pl/articles/2059958.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
landslide
susceptibility map
index of entropy
SOPO
Beskid Niski Mts.
Opis:
Landslides are one of the most prominent processes degrading the Beskidy Mts. slopes. Susceptibility assessment is based on the detailed mapping of the Dukla commune (235 km2) at the scale 1: 10,000 in frames of the project Landslide Counteracting System. The terrain affected by landslides is 19.59 km2, which is 8.34% of the researched area. The largest number of landslides can be found in the Beskid Dukielski Mts. area, where nearly 78% of all landslide areas are concentrated. Analysis of landslide-causing factors was performed using the index of entropy method. The following five factors were considered: lithology, slope inclination, slope aspect, distance to faults, and distance to drainage. The most important role in the development of mass movements in the study area is played by slope inclination (0.0079) and lithology of siliciclastic flysch (0.0066). The method applied also contributed to devising a landslide susceptibility map of considerable accuracy at 90.5%. The analyses of the landslide factors have proven that understanding of geology and landforms is not only of cognitive significance, but adds to practical applications in spatial management. The studies confirmed usefulness of large-scale mapping of landslides and applying statistical methods and GIS techniques in the spatial analysis of landform transformations. The obtained landslide susceptibility map can be a basis for assessing landslide risk. High and very high landslide susceptibility classes cover nearly 50% of the study area.
Źródło:
Geological Quarterly; 2016, 60, 3; 586--596
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mineralogy and in situ S and Pb isotope characteristics of ore minerals from polymetallic mineralization in the Gierczyn-Przecznica area, SW Poland
Autorzy:
Foltyn, Krzysztof
Kozub-Budzyń, Gabriela Anna
Lahaye, Yann
Piestrzyński, Adam
Skirak, Paulina
Zygo, Władysław
Pieczonka, Jadwiga
Powiązania:
https://bibliotekanauki.pl/articles/27323311.pdf
Data publikacji:
2023
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Pb isotopes
S isotopes
polymetallic mineralization
cobalt
ore geology
Sudety Mts.
Opis:
Chlorite-mica-quartz schist in the Gierczyn-Przecznica area in SW Poland contains polymetallic ores which were the source of tin and cobalt in the past. This mineralogical study revealed the presence of silver-bearing minerals including members of the tetrahedrite (Ag <3 apfu) and freibergite series (3 < Ag < 8 apfu), galena (0.26–1.48 wt.% Ag), and a phase with the chemical composition of Te-rich canfieldite Ag8Sn(S,Te)6. In Przecznica Sn-sulphides are represented by stannite while cobaltite is the most abundant host for cobalt, followed by Co-bearing arsenopyrite. Glaucodot, ullmannite and members of the löllingite-rammelsbergite solid-solution series (Fe,Ni,Co)As2 also contain cobalt but are scarce in the samples. An exposure in the “Psi Grzbiet” area is characterized by the presence of Ag, Ni, Sb and Te minerals accompanied by very small amounts of As-bearing phases (represented by arsenopyrite) while the mineralogical composition in the Przecznica area is characterized by an abundance of As phases and a lack of Sb minerals. Sulphur isotopes of sulphides from Przecznica are heavier than in most deposits related to the Karkonosze Granite intrusion, while their Pb isotope signature in galena suggests an Early Paleozoic pre-Variscan affinity rather than a Variscan one.
Źródło:
Geological Quarterly; 2023, 67, 1; art. no. 10
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:
Geochemical variations within the Upper Oligocene-Lower Miocene lava succession of Úhošt Hill (NE margin of Doupovské hory Mts., Czech Republic)
Autorzy:
Rapprich, V.
Holub, V. F.
Powiązania:
https://bibliotekanauki.pl/articles/2060213.pdf
Data publikacji:
2008
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Úhošď Hill
Doupovské hory Mts.
lava-flow succession
basalt
picrobasalt
ankaramite
Opis:
Purely effusive activity built up a sequence of nine lavas on Úhoš' Hill. The oldest erupted lavas are tephrites/basanites (28.66 ± 1.06 Ma) and are of slightly evolved character. These are overlain by more differentiated alkali basalt. The succession continues with picrobasaltic lavas rich in phenocrysts (ankaramites 26.38 ± 1.04 Ma). The entire succession is crowned by alkali ba alt lavas (22.09 ± 0.73 Ma). All lavas appear to be emitted from a common conduit. With respect to geochemical and isotopic data, how ever, the studied sequence could not be interpreted in terms of the exhausting of a simple magma chamber. We propose the role of a more complex reservoir or, of two independent reservoirs attached to a single conduit system. The tephrites/basanites and picrobasalts (ankaramites) are closely related, the latter being derived by accumulation of mafic phenocrysts, namely clinopyroxene. The bas alts form an other group differing from the tephrites/basanites and picrobasalts in more evolved isotopic compositions of Sr and Nd as well as in in compatible-elementratios. The isotopic composition of the lavas seems to reflect mixed man tle sources derived from the European Asthenospheric Reservoir through the addition of components similar to Enriched Mantle (EM 1 and EM 2). The basalts originated by fractionation of different magma batches that contained a higher proportion of the enriched mantle component(s) or that were more contaminated with crustal material.
Źródło:
Geological Quarterly; 2008, 52, 3; 253-268
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ancylite-(Ce) from quartz-calcite-chlorite veins in phyllite of the Opava Mountains (SW Poland)
Autorzy:
Janeczek, Janusz
Szopa, Krzysztof
Fabiańska, Monika
Powiązania:
https://bibliotekanauki.pl/articles/2060272.pdf
Data publikacji:
2020
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
ancylite-(Ce)
phyllite
CO2-rich hydrothermal solution
Opava Mts.
Polska
Opis:
Ancylite-(Ce) occurs in quartz-calcite-chlorite veins crosscutting the foliation of phyllite in the Dewon Quarry in the foothills of the Opava Mountains of the eastern Sudetes, south-west Poland. Irregularly shaped grains of ancylite are up to 67 μm long and 22 μm wide. The compositional range of ancylite, determined by electron microprobe, is expressed by the empirical formula: (Sr0.65-0.55Ca0.19-0.14Fe0.03-0.00)∑0.87-0.69 (Ce0.58-0.50Nd0.26-0.22La0.26-0.21Pr0.06-0.05Sm0.05-0.04Gd0.07-0.03Dy0.01-0.00)∑1.29-1.05 (CO3)2(OH1.07-0.99F0.22-0.0.06)∑1.29-1.05· 0.95-0.93H2O. Ancylite crystallized directly from CO2-rich hydrothermal solutions as the last mineral in the veins following precipitation of calcite. The solution temperature, estimated using various chlorite geothermometres, was in the range of 260-340°C.
Źródło:
Geological Quarterly; 2020, 64, 3; 801--806
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 22

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