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Tytuł:
Some Remarks on the Significance of Gold Based on Byzantine Ekphraseis of Works of Art
Autorzy:
Garnczarska, Magdalena
Powiązania:
https://bibliotekanauki.pl/articles/1032079.pdf
Data publikacji:
2020-12-23
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Byzantine aesthetics
ekphrasis
gilding
mosaic
marble
Opis:
The abundance of gilding is considered to be a particularly characteristic feature of Byzantine art. This attribute can be confirmed by even a cursory analysis of works of art. In short, Byzantine artists used gold on a large scale, showing great technical skill. It is therefore quite surprising that this issue has not yet received a separate, comprehensive study. Admittedly, researchers recognize the presence of gold but unfortunately, they almost do not go beyond general observations. On the one hand, they emphasize the primary role of the symbolic meanings of gold, and, on the other, they indicate the high material value of this precious metal. These comments are usually very general and their authors rarely refer to specific primary sources. Their observations, however, speak more about present-day ideas about Byzantine culture than about it itself. The indicated problem is an important and extensive task to be done, hence this paper is only an outline of the most important questions, each of which requires a separate and in-depth study. Therefore, this synthetic article introduces the most basic points associated with the understanding of gold in Byzantium. For this purpose, selected examples of Byzantine texts in which their authors referred to gold in a strictly artistic context are analysed. Thus, the main thesis is as follows: in Byzantine painting, gold, one of the most important devices of artistic expression, was used on a large scale primarily for aesthetic reasons.
Źródło:
Studia Ceranea; 2020, 10; 83-121
2084-140X
2449-8378
Pojawia się w:
Studia Ceranea
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Precipitated calcium carbonate production, synthesis and properties
Autorzy:
Erdogan, N.
Eken, H. A.
Powiązania:
https://bibliotekanauki.pl/articles/110023.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
precipitated calcium carbonate
waste marble powder
whiteness
Opis:
Calcium carbonate (CaCO3) is the most widely used filler material in paper, paint, plastic, food, ceramic, cosmetic, medicine and other industries. In the present paper, precipitated calcium carbonate (PCC) has been produced from waste marble powder (WMP) by the Calcination-Dissolution-Precipitation (CDP) method. Calcination, dissolution and precipitation experiments were carried out under various conditions including : calcination temperature (800, 850, 900, 950 and 1000 °C), dissolution time (2.5, 5.0, 7.5 and 10.0 min) and precipitation time (2.5, 5.0, 7.5, 10.0, 12.5 and 15.0 min). Then, XRF, XRD, SEM, particle size, whiteness, brightness and yellowness analyses were performed for the characterization of the produced PCC materials. The analyses showed that the precipitate was mainly micrometer-sized (d50 = 1.682 μm) rhombohedral calcium carbonate crystals with 54.5% CaO. The whiteness, brightness and yellowness tests of the precipitates, conducted by Datacolor Elrepho 450x spectrometer, were determined to be 91.28, 98.2 and 1.99%, respectively. It was finally concluded that the produced PCC material reasonably meets Turkish Standards (TS 11653/1995) and can be used in paper industry.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 1; 57-68
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of physical and mechanical properties of limestones used as marble in Tut-Adiyaman Region in Turkey
Autorzy:
Rizaoğlu, Tamer
Çoşkun, Canberk
Camuzcuoğlu, Murat
Powiązania:
https://bibliotekanauki.pl/articles/27324327.pdf
Data publikacji:
2022
Wydawca:
Instytut Techniki Górniczej KOMAG
Tematy:
natural stone
marble
limestone
physico-mechanical tests
Opis:
This study aimed to reveal the petrography and physical-mechanical properties of limestones, which have an important reserve and are used as marble, in Tut district of Adıyaman province, which is one of the important cities of southeast Anatolia. As a result of petrographic analysis of the rock known commercially as Emprador, it was determined that it is bioclastic limestone with abundant nummulite fossils. Density, dry and saturated unit weight, water absorption, surface roughness, abrasion resistance and uniaxial compressive strength tests were applied to determine the physical and mechanical properties of the limestones. According to the test results obtained, the density of the limestones, dry unit weight, saturated unit weight, water absorption by weight, water absorption by volume, average surface roughness, ten points roughness average, maximum roughness value, Bohme abrasion resistance and uniaxial compressive strength values were determined as 2.486 gr/cm3, 2.478 gr/cm3, 2.52 gr/cm3, 1.482%, 3.644%, 3.31 μm, 16.24 μm, 20.03 μm, 8.958 cm3/50cm2 and 1004.03 kgf/cm2 respectively. The results show that the limestones in and around Tut (Adıyaman) county can be used in large areas for decorative purposes, with their physical and mechanical properties, as well as their colour tone and the texture formed as a result of the calcite veins being shaped like a natural pattern.
Źródło:
Mining Machines; 2022, 40, 3; 141--148
2719-3306
Pojawia się w:
Mining Machines
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
IDENTYFIKACJA MARMURU UŻYTEGO W SARKOFAGU WŁADYSŁAWA JAGIEŁŁY W KATEDRZE WAWELSKIEJ
ORIGIN OF THE MARBLE OF THE TOMB OF KING JAGIELLO IN THE WAWEL CATHEDRAL IN KRAKOW
Autorzy:
Bromowicz, Jan
Magiera, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/537890.pdf
Data publikacji:
2006
Wydawca:
Narodowy Instytut Dziedzictwa
Tematy:
TOMB OF KING JAGIELLO (MARBLE ANALYSIS)
WAWEL CATHEDRAL
Opis:
In an attempt to identify the marble of the tomb of King Jagiello, three kinds of marbles were used as a refernce material, i.e.: Italian Ammonitico Rosso, Austrian Roter Knollenkalk and Hungarian red. Structure, texture and mineral composition were examined and SEM-EDAX analysis was done. Very limited size of the sample available disabled the use of the optical microscope. Generally, the tomb is made of red limestone with a nodular structure and sound, non porous texture. The nodules are 1 to 5 cm in diameter. This kind of a decorative limestone being succeptible to carving and polishing is traditionally called a 'marble'. Four varieties were identified in the tomb: Variety 1. Colour is red-brownish, nodules are slightly lighter than a matrix. Indistinct parallel bedding, stylolites and ammonites can also be seen. Variety 2. Generally, red-brownish in colouring, with stronger contrast between nodules (yellow-pinkish) and matrix (brown-reddish). Variety 3. Dark red-brownish. Nodules do not contrast strongly from the matrix. Variety 4. Colour is intermediate between varieties 1 and 2. Structure, texture and colour point to the Ammonitico Rosso marble as a stone applied in the tomb. Size, shape and colour of the nodules as well as colouring of the matrix make it similar to a variety that occurs in the vicinity of Verona and is called Rosso di Verona. Hungarian marbles obviously differ from that used in the tomb. Their colouring is generally darker and more brownish. Nodules are less pronounced and less contrasted from the matrix. SEM and SEM-EDAX analyses did not appear particularly diagnostic. The sample from the tomb was generally more fine grained than the reference samples thus disabling comparison of further structural and textural features. However, similarities were detected between the tomb marble and the Rosso di Verona marble, e.g. in the texture and number of genarations of the micrite, presence of clay minerals and iron oxides. Noticeable is a presence of Al, Si and K in the tomb marble, being apparently connected with clay minerals and with products of chemical weathering. All this point to the Rosso di Verona as the most probable stone applied in the tomb. Chemical composition of the marbles form the Verona area is following: Si - 5.90% CaO - 51.31% MgO - 0.14% CO2 - 40.48% Fe2O3 - 0.66 % FeO - traces Al2O3 - 0.84% Mn - traces Average porosity is less than 0.5%, and water sorption is less than 0.1% (W. D. Grimm, R. Snethlage, 1984).
Źródło:
Ochrona Zabytków; 2006, 3; 87-96
0029-8247
Pojawia się w:
Ochrona Zabytków
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Marble from Neolithic quarries at the Bílý Kámen Hill near Sázava (Central Bohemia, Czech Republic) and its petrographic-geochemical characterization
Autorzy:
Přichystal, Antonín
Burgert, Pavel
Gadas, Petr
Powiązania:
https://bibliotekanauki.pl/articles/2058626.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
prehistoric mining
marble
Neolithic
Bílý Kámen
Bohemia
petroarchaeology
Opis:
The longest known prehistoric quarries for non-siliceous (non-flint) rocks in continental Europe were discovered on the Bílý Kámen Hill in central Bohemia (Czech Republic) already in the period between the World Wars. Due to post-war events, this has been all but forgotten, and awareness of this important locality still exists only in the local research community. Its research potential has not yet been exhausted. The article presents the first exact mineralogical and geochemical characteristics of the raw material extracted in these prehistoric quarries. The raw material is fundamentally different from some of the marble artefacts from nearby workshops. The aim of this research is to create a solid foundation for the future detailed study of prehistoric artefacts made from marble and to review the deep-rooted idea of their distribution within the oldest agricultural communities in Central Europe.
Źródło:
Geological Quarterly; 2019, 63, 4; 811--821
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of flocculation behavior of marble powder suspensions
Autorzy:
Duzyol, S.
Powiązania:
https://bibliotekanauki.pl/articles/951841.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
flocculation
marble powder
water soluble polymer
starch
turbidity
Opis:
In this study, flocculation of marble powder suspensions was investigated depending on a polymer type and dosage. Polyacrylamide was used as a synthetic polymer, while starch was used as a natural polymer. The effect of polyacrylamide type was also examined using anionic, cationic and non-ionic polyacrylamides. Flocculation of suspensions was ascertained by turbidity measurements. It was found that anionic and especially non-ionic polymers flocculated the marble powder suspension more strongly than starch and cationic polymer. On the other hand, it was observed that the sequential addition of starch and polymer did not improve flocculation of suspension. On contrary, sequential addition of flocculants caused re-dispersion of the flocculated suspension. When a non-ionic polymer was used as the flocculant, the reached minimum turbidity of suspension was measured to be 38 NTU (nephelometric turbidity unit).
Źródło:
Physicochemical Problems of Mineral Processing; 2015, 51, 1; 5-14
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Reactivity of marble wastes for potential utilization in wet flue gas desulphurization
Autorzy:
Altun, N. E.
Powiązania:
https://bibliotekanauki.pl/articles/110132.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
marble
reactivity
thermal power production
SO2
desulphurization
Opis:
Wastes of most marble types are distinguished with their superior CaCO3 content and potential to utilize them as an alternative to limestone. Control of SO2 using marble wastes in wet flue gas desulphurization (WFGD) units of coal fired thermal power plants is an important opportunity. In this study, nine types of marble wastes were evaluated in terms of their ability to dissolution (reactivity) in an acidic environment. The reactivity was expressed as fractional conversion with time with respect to the chemical composition and particle distribution of wastes as well as temperature and pH of solution. Dissolution reaction rate constants were also computed. Reactivity of the wastes varied significantly with chemical compositions of the marble types. The same marble type displayed different dissolution profiles as a function of test conditions (fineness, temperature, pH). Higher contents of CaCO3 and Fe2O3 positively influenced dissolution ability and rates, whereas increased MgCO3 content had adverse effects. The changes in particle size, temperature and pH influenced the reactivity. The reactivity increased with decreasing particle size. Also, higher temperature and increased acidity favored dissolution ability of the marble wastes. Our results showed that under optimized conditions marble wastes, having a higher content of CaCO3 and low content of MgCO3, are potential SO2 sorbent alternative.
Źródło:
Physicochemical Problems of Mineral Processing; 2016, 52, 1; 497-509
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study on the shear creep characteristics of anchored jointed rock masses under creep fatigue loading
Autorzy:
Song, Yang
Li, Yong-Qi
Powiązania:
https://bibliotekanauki.pl/articles/2200837.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
disturbed load
sandstone
marble
creep body
rheological model
Opis:
To study creep characteristics of deep rock masses under low-frequency earthquakes and other loads, sandstone and marble samples were used to characterize soft rock and hard rock, respectively. Shear creep tests of anchored rock masses under fatigue loading were carried out by using the graded loading method. A new nonlinear rheological model was constructed to characterize mechanical properties of anchored rock masses under fatigue loading. Creep fatigue curves of soft rock and hard rock have clear creep characteristics including instantaneous, attenuation, steady-state and accelerated creep stages. This work provides new insights into the stability of rock masses.
Źródło:
Journal of Theoretical and Applied Mechanics; 2022, 60, 4; 625--635
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
“The thin delights of moonshine and romance”: Romance, Tourism, and Realism in Hawthorne’s <i>The Marble Faun</i>
Autorzy:
Martinez, Carlo
Powiązania:
https://bibliotekanauki.pl/articles/626172.pdf
Data publikacji:
2018
Wydawca:
Wydawnictwo Uniwersytetu Śląskiego
Tematy:
Nathaniel Hawthorne
Tourism
Italy
The Marble Faun
Romance
Realism
Opis:
Carlo MartinezUniversità “G. d’Annunzio” di Chieti-Pescara, Italy “The thin delights of moonshine and romance”: Romance, Tourism, and Realism in Hawthorne’s The Marble Faun Abstract: Hawthorne’s involvement with the logic of the tourism of his day is a key aspect of his development as a fiction writer. Starting from a discussion of the early sketch “My Visit to Niagara” the article argues that the discourse of tourism, with its protocols and practices, is for Hawthorne a fertile breeding ground and conceptual framework for the elaboration of a new rationale and a new aesthetic for the fiction writing he calls “romance.” It then explores how tourism resonates in the romance which takes it as its central thematic concern: The Marble Faun. Hawthorne’s last completed long work of fiction represents a moment of artistic and personal crisis for the author, who finds his notion of romance writing caught in a sort of double bind created by the touristic nature of his stay in Italy. As the plot of the novel suggests, in his efforts to extricate himself from the situation, Hawthorne, envisioned and experimented with a new kind of writing that led him to revise and alter radically the romance form he had previously elaborated in favor of a much more realistic style of fiction. Keywords: Nathaniel Hawthorne; Tourism; Italy; The Marble Faun; Romance; Realism
Źródło:
Review of International American Studies; 2018, 11, 2
1991-2773
Pojawia się w:
Review of International American Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Flexural characterization of polymer concrete comprising waste marble and date palm fibers
Autorzy:
Rokbi, Mansour
Rahmouni, Zine El Abidine
Baali, Brahim
Powiązania:
https://bibliotekanauki.pl/articles/298435.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Warmińsko-Mazurski w Olsztynie
Tematy:
polymer concrete
date palm fibers
quartz
marble
fibers sizing
Opis:
Three-point bending. Abstract This work is an experimental approach for the development and characterization of a polymer concrete reinforced with natural fibers. The polymer concrete consists of sand (Quartz) and orthophthalic polyester used as a binder. Marble powder was used to ensure the continuity of the particle size of the granular mixture. As reinforcement, 2% of chopped date palm fibers (short, very short or mixed) were added. For comparison, identical polymer concrete flexure specimens reinforced with the same content of short E-glass fibers were also prepared and tested. All specimens were initially cured at room temperature and then post-cured for 6 h at 70°C. The results of three-point bending on smooth specimens with different rates of charges (marble), showed that the flexural and compressive strength were improved by adding 20% of marble, and were 31.80 MPa and 67.42 MPa respectively. The flexural strength of specimens showed that the improvement or the degradation of polymer concrete properties seemed to be attributed to the nature of fibers (treated or untreated), and/or to the fibers sizing (short, very short or mixed).
Źródło:
Technical Sciences / University of Warmia and Mazury in Olsztyn; 2019, 22(2); 169-182
1505-4675
2083-4527
Pojawia się w:
Technical Sciences / University of Warmia and Mazury in Olsztyn
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jurassic red nodular limestone from NE Slovakia used as the Ľubovňa “marble” during the Renaissance in Slovakia and Poland
Autorzy:
Pivko, D.
Powiązania:
https://bibliotekanauki.pl/articles/2060362.pdf
Data publikacji:
2017
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Ľubovňa “marble”
nodular limestone
Stará Ľubovňa
tombstone
Slovakia
Polska
Opis:
The Ľubovňa “marble” is red nodular limestone of Oxfordian to Tithonian age, which used to be extracted in several quarries near the town of Stará Ľubovňa in NE Slovakia. It replaced the Hungarian Gerecse “marble” which was extensively used in the Kingdom of Hungary and surrounding countries from the end of the 12th to the first third of the 16th century when its use was interrupted by the Turkish occupation of the area. The Ľubovňa “marble” was used as a substitution especially for Renaissance tombstones in today’s Slovakia and Poland and it was found also in Hungary. It reached the top of its popularity between the mid-16th and mid-17th century. To a smaller extent it was still used in the surrounding territories during the other styles in the 18th and 19th centuries. The “marble” production was probably affected by the political situation and wars. It is possible to distinguish the Ľubovňa “marble” from the Gerecse “marble” and the Adnet “marble” from Austria macroscopically on the basis of its distinct cleavage, and microscopically on the basis of microfacies with Saccocoma, Globuligerina and calcareous dinoflagellates. According to the stable isotopes of 18O and 13C, it is approximately similar to the Adnet “marble”.
Źródło:
Geological Quarterly; 2017, 61, 1; 53--61
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Alexandria, Kom el-Dikka. Fieldwork in the 2019 season
Autorzy:
Majcherek, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/1634063.pdf
Data publikacji:
2020-12-19
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Tematy:
Alexandria
lime kilns
Roman mosaic
ceramics
decorative marble
conservation
Opis:
The report offers an account of archaeological and conservation work carried out at the site. Excavations in the central part of the site (Sector F) were continued for the fourth season in a row. Exploration of remains of early Roman houses led to the discovery of a well preserved multicolored triclinium mosaic floor with a floral and geometric design. A large assemblage of fragments of polychrome marble floor tiles, recorded in the house collapse, showed the scale of importation of decorative stone material from various regions of the Mediterranean. Overlying the early Roman strata was direct evidence of intensive construction work carried out in the vicinity in the form of large-scale kilnworks, supplying lime most probably for the building of the late Roman bath and cistern. Included in the presentation is a brief review of the limited conservation work that was conducted in the complex of late antique auditoria.
Źródło:
Polish Archaeology in the Mediterranean; 2020, 29(2); 469-496
1234-5415
Pojawia się w:
Polish Archaeology in the Mediterranean
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
From waste to treat waste : exploitation of marble dust as a harmful pollutant to a green adsorbent for dyes and heavy metals from industrial wastewater
Autorzy:
Attia, H.A.
Farghaly, Mohamed G.
Saleh, A.M.
Abdel Khalek, M.A.
Powiązania:
https://bibliotekanauki.pl/articles/2175448.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
marble dust
pollutant
adsorbent
dye
heavy metals
textile wastewater
Opis:
The marble dust as a harmful industrial waste of marble fabrication was evaluated as aneconomical and efficient green adsorbent for Acid Red-1 dye and lead ions. The XRD, XRF, particle size, surface area and zeta-potential measurements were used to characterize the marble dust. The removal efficiency was optimized by studying several parameters such as pH, temperature, contact time, adsorbent dose and initial concentration. The optimum removal was achieved at pH 6, 20°C after 60 min in the presence of 2.5g/L marble dust. The rates of adsorption were found to follow the pseudo-second-order model. The results showed better fitting to Freundlich isotherm. The thermodynamic studies revealed that the adsorption process is spontaneous, exothermic and favorable at low temperature. The free energy (∆G°), enthalpy (∆H°), and entropy (∆S°) changes were calculated to predict the nature of adsorption.The removal efficiency was improved by calcination of the marble at 700°C. Application for textilewastewater showed high removal efficiency up to 99.9%of inorganic and organic pollutants. The product of treatment was used in the concrete and bricks manufactured, so there is nogeneration of second-order pollutants.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 154007
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dębnik and Paczółtowice “Marbles” in the architecture of Krakow
Autorzy:
Makowska, D.
Powiązania:
https://bibliotekanauki.pl/articles/89214.pdf
Data publikacji:
2015
Wydawca:
Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
Tematy:
carboniferous limestone
Paczółtowice marble
Dębnik limestone
Polish onyx
Dębnik anticline
Opis:
In the architecture of Krakow we can find many stones which were quarried mostly from de-posits situated not far from the town. They gave a unique image of present, visible elements in the architecture. Many artists used a marble as the building and decorative stone, in sculptures and sepulchral art. Since XIVth century one of the most popular types of stone, which have been applied in the architecture of Krakow, is the Dębnik “marble”. After polishing, it has a deep black colour and, together with Paczółtowice “marble” has been given the fantastic complement of decorative elements in the monu-ments. In the Krakow we can find a lot of places where both “marbles” have been applied as a decorative elements in the architecture. These stones were forming the cultural heritage of Cracow. Usually they are used in sacred architecture. Dębnik and Paczółtowice “marbles” have been applied in many places, for example at the St Mary's Church and at the Wawel Cathedral, as well at Collegium Maius, St Adalbert’s Church in Market Square or at St Peter and Paul’ Church.
Źródło:
Mining Science; 2015, 22, Special Issue 2; 79-92
2300-9586
2353-5423
Pojawia się w:
Mining Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Indications of HP events in the volcanosedimentary succession of the Orlica–Śnieżnik Dome, NE Bohemian Massif: data from a marble-amphibolite interface
Autorzy:
Twyrdy, M.
Żelaźniewicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/2060385.pdf
Data publikacji:
2017
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
high-pressure episode
P-T path
marble-amphibolite association
Sudetes
Opis:
A volcanosedimentary succession of the Młynowiec-Stronie Group (MSG) in the Orlica–Śnieżnik Dome (OSD), the Sudetes, NE Bohemian Massif underwent multiple folding and shearing during the Variscan Orogeny. In the sheared domains, there are less deformed pods in which rocks preserve better records of metamorphic events prior to the regional temperature peak. In one such pod, near Gniewoszów on the western limb of the dome, marbles enclosed by massive amphibolites occur. In these rocks, zoned plagioclase with actinolite and epidote inclusions and zoned amphibole grains allowed recognition of three mineral assemblages and three P-T stages at: (1) 310°C/3–4 kbar, (2) 480–500°C/10.5 kbar, (3) 500–530°C/6–6.5 kbar, based on isopleth intersections and checked against conventional thermobarometry. These define a steep clockwise P-T path and a geothermal gradient of 17°C/km before peak conditions were attained, which suggests subduction of the metavolcano-sedimentary rocks (Stronie Formation of the MSG) on the western limb of the OSD, with a transient yet discrete higher pressure episode. Mineral relicts capable of demonstrating a higher pressure event are scarce in the supracrustal rocks of the dome, mainly because they became more thoroughly equilibrated and obliterated during the temperature peak at mid-amphibolite facies conditions and the subsequent ubiquitous greenschist facies overprint.
Źródło:
Geological Quarterly; 2017, 61, 2; 435--449
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł

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