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Tytuł:
Experience Gained during the Decommissioning of the SSEC from the VVR-S Nuclear Research Reactor
Autorzy:
Deju, R.
Iorga, I.
Gurau, D.
Powiązania:
https://bibliotekanauki.pl/articles/1033371.pdf
Data publikacji:
2017-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
28.41.Te
Opis:
The VVR-S nuclear research reactor owned by Horia Hubulei National Institute of Physics and Nuclear Engineering was designed for research and radioisotope production being permanently shut-down in 2002 after 40 years of operation. The decommissioning of the reactor started in 2010 and is planned to be finalized in 2020, being the first nuclear research reactor that has started the decommissioning project from the South-East of Europe. This paper presents the lessons learned from the decommissioning of systems, structures, equipment and components from pumps room. The experiences gained cover a diverse range of topics from planning, approval, radiological characterization process made, dismantling, equipment used, resources, etc. Radiation protection and economics are the key factors for the selection of technology for decommissioning. The evaluation of the available technology has been made and areas for improving the technology have been identified. Dedicated and advanced technologies were chosen to perform specific tasks. The project was planned well in advance. Safety aspects have been taken into consideration. Resource constraints have also been an important issue considered in defining the decommissioning strategy. Experiences and knowledge were presented and shared with the community.
Źródło:
Acta Physica Polonica A; 2017, 131, 1; 82-88
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role of Operational Radioprotection Simulation in the Dismantling of the Protection and Control Rods of VVR-S Reactor
Autorzy:
Iorga, I.
Deju, R.
Gurau, D.
Mincu, M.
Powiązania:
https://bibliotekanauki.pl/articles/1033535.pdf
Data publikacji:
2017-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
28.41.Te
Opis:
The VVR-S nuclear research reactor owned by Horia Hubulei National Institute of Physics and Nuclear Engineering, has functioned between 1957 and 1997 at a nominal thermal power of 2 MW, using less-enriched nuclear fuel (10%), type EK-10, and highly enriched fuel (36%), type S-36. The reactor control was carried out by means of nine rods placed in the central part of the core. Four rods were used for the manual control of power, one for automatic control, three rods for reactor safety (emergency rods) and one for the fine control of power. One of the high hazard operations was the dismantling of the activated-contaminated control rods. Because of a higher radiological risk, simulation was performed to determine the expected maximum dose. The maximum gamma dose rate obtained using simulated results was 3.5 Sv/h, for the highly activated rod. In the real measurement, when the work was performed, the maximum gamma dose rate was 3 Sv/h. ⁹⁰Sr+⁹⁰Y are expected to be present in the control rods radioactivity.
Źródło:
Acta Physica Polonica A; 2017, 131, 3; 514-518
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
„Szkoła w internecie”: województwo podlaskie i mazowieckie – regionalne zróżnicowania w wykorzystaniu internetu w edukacji na poziomie podstawowym, gimnazjalnym i ponadgimnazjalnym
: “SCHOOL ON THE INTERNET”: PODLASKIE AND MAZOWIECKIE VOIVODESHIPS – REGIONAL VARIATIONS IN THE USE OF THE INTERNET IN PRIMARY, LOWER-SECONDARY AND SECONDARY EDUCATION
Autorzy:
Laskowski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/597649.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet w Białymstoku. Wydawnictwo Uniwersytetu w Białymstoku
Tematy:
TE INTERNET
REGIONAL DIFERENCES
SCHOOL WEBSITES
Opis:
Te article describes the regional variations in the use of the Internet in primary, lower-secondary and secondary schools in Podlaskie and Mazowieckie provinces. School sites were analyzed in terms of functionality, standards and the use of new forms and methods of creating the image of the website. Te results showed diferent levels of the use of Internet technologies and the opportunities associated with them. What surprises is the minimal degree of utilization of two-way communication with the available tools and programs designed for this purpose.
Źródło:
Pogranicze. Studia Społeczne; 2012, 20; 259-269
1230-2392
Pojawia się w:
Pogranicze. Studia Społeczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of Ag2Te Addition on Thermoelectric Properties of Bismuth Telluride
Autorzy:
Drzewowska, Sylwia
Lan, Tian-Wey
Onderka, Bogusław
Powiązania:
https://bibliotekanauki.pl/articles/2048873.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermoelectric materials
Seebeck coefficient
resistivity
thermal diffusivity
Bi2Te3-Ag2Te system
Opis:
The resistivity, Seebeck coefficient and thermal diffusivity were determined for BiTe3 + Ag2Te composite mixtures. Subsequent measurements were carried out in the temperature range from 20 to 270°C, and for compositions from pure Bi2Te3 to xAg2Te = 0.65 selected along the pseudo-binary section of Ag-Bi-Te ternary system. It was found that conductivity vs. temperature dependence shows visible jump between 140 and 150°C in samples with highest Ag2Te content, which is due to monoclinic => cubic Ag2Te phase transformation. Measured Seebeck coefficient is negative for all samples indicating they are n-type semiconductors. Evaluated power factor is of the order 1.52·10-3 and it decreases with increasing Ag2Te content (at. %). Recalculated thermal conductivity is of the order of unity in W/(m K), and is decreasing with Ag2Te addition. Finally, evaluated Figure of Merit is 0.43 at 100°C and decreases with temperature rise.
Źródło:
Archives of Metallurgy and Materials; 2022, 67, 1; 5-15
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Radiation Shielding Properties of Fabrics using Image Processing Method
Autorzy:
Kilinçarslan, Ş.
Üncü, İ.
Akkurt, İ.
Günoğlu, K.
Akarslan, F.
Coşkunsu, S.
Powiązania:
https://bibliotekanauki.pl/articles/1031660.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
28.41.Te
07.05.Pj
Opis:
It is extremely important to protect the human body from radioactive rays. Protective clothing can be used to absorb radiation because it is preferable to avoid the natural and artificial radiation exposure in our daily lives. There are many different types of fabric, used for clothes. In this study radiation absorbing properties of fabrics, which are widely used in the daily life, such as alpaca-type fabric, cotton fabric, cotton polyester blend fabric, woven dyed fabric and knitted fabric were examined using the image processing method.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 1171-1172
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Te Deum Arvo Pärta. Między kompozytorskim métier a gatunkowym arché
Arvo Pärt’s Te Deum. Between composer’s métier and arché of the genre
Autorzy:
Wieczorek, Anna
Powiązania:
https://bibliotekanauki.pl/articles/513894.pdf
Data publikacji:
2014-10-01
Wydawca:
Uniwersytet Jagielloński. Koło Naukowe Studentów Muzykologii UJ
Tematy:
Arvo Pärt
Te Deum
tradition
genre
hymn
Opis:
The hymn of Te Deum laudamus is strongly rooted in the tradition of the Christian Church. Its history reaches back to the 14th century. It is a breviary hymn for Sunday and holiday Lauds. With time it emancipated from the Liturgy of the Hours and became an independent basis for many monumental compositions. The hymn by Pärt refers in many ways to the tradition of early music. However, the most essential foundation of the hymn is its own contemporary composer language and unique stylistic conception. Based on the tintinnabuli technique the hymn was influenced by Medieval Latin, Gregorian chorale, double vocal organum and baroque musical rhetoric (suspiratio, anabasis, katabasis, exclamatio etc.). The key is not only stylization of Gregorian chorale in all the verses beginning each part but also diatonic nature of the composition. Pärt’s Te Deum begins and ends with a silence. The internal dramaturgy of the hymn occurs in subtle tensions following one after another. Liturgical references are exposed by the composer by adding Amen and Sanctus to the source text. Te Deum is not a majestic ode to the God, as the hymn is dominated by the imploring and contemplating tone. The quintessence of this musical composition are pleas for mercy (Fiat misericordia tua), hope and belief in the Last Judgement (Iudex crederis esse venturus) featured in the two climax points.
Źródło:
Kwartalnik Młodych Muzykologów UJ; 2014, 4(23); 4-20
2956-4107
2353-7094
Pojawia się w:
Kwartalnik Młodych Muzykologów UJ
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ruch Młodej Polski. Historia i współczesne reminiscencje
Young Poland Movement
Autorzy:
Lewandowski, Arkadiusz
Powiązania:
https://bibliotekanauki.pl/articles/519690.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Mikołaja Kopernika w Toruniu. Wydawnictwo UMK
Tematy:
Młoda Polska
lata 90-te
myśl polityczna
Opis:
The article considers the phenomenon of one of the most intellectually active, anticommunist opposition group in Poland. The Young Poland Movement organiza- tion was established in 1979 and ended its activity after ten years. Furthermore, the magazine "Bratniak” constituted the main press measure in presenting the ideas of its members. The author presents the peculiarity of creating the Young Poland Movement, es- pecially the significance of the group connected with magazine "Bratniak”. Moreover, the author analyses the ideological declaration of Young Poland Movementand out-lines principal values acknowledged by the group. The article also emphasizes the importance of obstacles thatthe group was facing during the political transformation in Poland. The finał outcome of the events at the turn of the 1989 and 1990 was particularly visible in termination of Young Poland Movement activity. In order to such occurrence its members joined various political groups. Itcould be caused by two differentviews of political action, thatwere noticeable among the Young Poland Movement members.
Źródło:
Historia i Polityka; 2009, 1(8); 47-62
1899-5160
2391-7652
Pojawia się w:
Historia i Polityka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Historia zrealizowanego projektu
History of the completed project
Autorzy:
Birnbaum, Grażyna
Powiązania:
https://bibliotekanauki.pl/articles/2055834.pdf
Data publikacji:
2021
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
produkcja I-131
wzbogacony w Te-130 ditlenek telluru
production of I-131
Te-130 enriched tellurium dioxide
Opis:
Zastosowanie w reaktorze jądrowym wzbogaconego w nuklid Te-130 ditlenku telluru do otrzymywania I-131, w wyniku reakcji jądrowej (n, γ). W artykule przedstawiono korzyści, jakie można uzyskać po wprowadzeniu nowego surowca i plan dalszych badań
The use of Te-130 nuclide enriched tellurium dioxide in a nuclear reactor for the preparation of I-131 as a result of a nuclear reaction (n, γ). The article present the benefits that can be obtained after the introduction of a new raw material and a plan for further research.
Źródło:
Postępy Techniki Jądrowej; 2021, 3; 23--24
0551-6846
Pojawia się w:
Postępy Techniki Jądrowej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dilatometric Analysis of the Sintering Behavior of Bi2Te3 Thermoelectric Powders
Autorzy:
Han, Ju-Yeon
Byun, Jong Min
Lee, Young-In
Choi, Byung Joon
Kim, Hogyoung
Oh, Sung-Tag
Powiązania:
https://bibliotekanauki.pl/articles/354899.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Bi2Te3
dilatometric analysis
sintering behavior
microstructure
Opis:
The sintering behavior of p-type bismuth telluride powder is investigated by means of dilatometric analysis. The alloy powders, prepared by ball milling of melt-spun ribbons, exhibit refined and flake shape. Differential thermal analysis reveals that the endothermic peak at about 280°C corresponds to the melting of bismuth, and peaks existing between 410°C and 510°C are presumably due to the oxidation and crystallization of the powder. The shrinkage behavior of ball-milled powders was strongly dependent of heating rate by the thermal effect exerted on specimens. In the case of 2°C/min, the peak temperature for the densification is measured at 406°C, while the peak temperature at a heating rate of 20°C/min is approximately 443°C. The relative density of specimen pressureless-sintered at 500°C exhibited relatively low value, and thus further study is required in order to increase the density of sintered body.
Źródło:
Archives of Metallurgy and Materials; 2020, 65, 3; 1117-1120
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Electroless Ni–P Plating on the Bonding Strength of Bi–Te-Based Thermoelectric Modules
Autorzy:
Kim, S. S.
Son, I.
Kim, K. T.
Powiązania:
https://bibliotekanauki.pl/articles/356583.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
thermoelectric
Ni–P plating
bonding strength
Bi–Te
soldering
Opis:
In the present study, electroless Ni–P plating was applied to Bi–Te-based thermoelectric materials as a barrier layer and the effect of the Ni–P plating on the bonding strength of the thermoelectric module was investigated. The bonding strength of the n- and p-type modules increased after being subjected to the electroless Ni–P plating treatment. In the case of the thermoelectric module that was not subjected to electroless Ni–P plating, Sn and Te were interdiffused and formed a brittle Sn–Te-based metallic compound. The shearing mostly occurred on the bonding interface where such an intermetallic compound was formed. On the other hands, it was found from the FE-EPMA analysis of the bonding interface of thermoelectric module subjected to electroless Ni-P plating that the electroless Ni-P plating acted as an anti-diffusion layer, preventing the interdiffusion of Sn and Te. Therefore, by forming such an anti-diffusion layer on the surface of the Bi–Te based thermoelectric element, the bonding strength of the thermoelectric module could be increased.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1225-1229
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyka wadowickiego kościoła w raporcie Służby Bezpieczeństwa z 1960 r.
Characteristics of the Wadowice Church in the report of the Security Service of 1960
Autorzy:
Glugla, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/458240.pdf
Data publikacji:
2016
Wydawca:
Wadowickie Centrum Kultury im. Marcina Wadowity
Tematy:
Kościół katolicki
Wadowice
Służba Bezpieczeństwa
lata 60-te
raport
Opis:
In Wadowice, there was a report in the security structures of the Militia. This institution dealt with also other activities such as. Against the Catholic Church and other religious associations. The present “Report” of 1960. shows the comprehensive measures against the clergy and the faithful. In the 18-hundred issues included picture and analysis of the activities of Wadowice political police. It contains the characteristics of the Church in the district Wadowice, the activities of agents, the repression of the local clergy and the then emerging problems. “Report” is prepared synthetically in accordance with the requirements of the arbitrarily imposed pattern.
Źródło:
Wadoviana. Przegląd historyczno-kulturalny; 2016, 19; 47 - 72
1505-0181
Pojawia się w:
Wadoviana. Przegląd historyczno-kulturalny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exploring goals and motivations of Māori heritage language learners
Autorzy:
Te Huia, Awanua
Powiązania:
https://bibliotekanauki.pl/articles/780439.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
motivation
heritage language
te reo Māori
indigenous language revitalization
Opis:
Motivations of Māori heritage language learners are explored within this qualitative study. Te reo Māori (the Māori language) is currently classed as endangered (Reedy et al., 2011), which calls for the exploration of the motivational experiences of Māori heritage language learners. A total of 19 interviews with beginner, intermediate and advanced level learners were conducted. Results demonstrated how Māori heritage learners were motivated to learn due to their cultural heritage connection to the language and to other ingroup members. This study explores some of the motivations why Māori heritage language learners learn te reo Māori. For this group of indigenous language learners, cultural and language revitalisation are tied to language motivation. Furthermore, the ability to participate in cultural practices was central to language motivations.
Źródło:
Studies in Second Language Learning and Teaching; 2015, 5, 4; 609-635
2083-5205
2084-1965
Pojawia się w:
Studies in Second Language Learning and Teaching
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of Crystal Growth Technique of Silicon by the Czochralski Method
Autorzy:
Kakimoto, K.
Powiązania:
https://bibliotekanauki.pl/articles/1399428.pdf
Data publikacji:
2013-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.08.-p
81.10.Dn
47.27.te
Opis:
We report on the Czochralski method for single silicon crystal growth and discuss heat and mass transfer and defect formation in the crystal. A reflector was used for separation of the heating and cooling areas in the furnace enabling us to speed up crystal growth. The melt flow to stabilize the temperature distribution in a crucible was controlled using transverse magnetic fields in a large-scale silicon Czochralski furnace. The setup allows for changes in important parameters of point defect formation to be made, such as vacancies and interstitials, by changing temperature and flow fields in the furnace. A numerical calculation was developed to predict the tendency for growth of a vacancy rich or interstitial rich crystal by estimating the value of the ratio between the growth rate and temperature gradient in the crystals.
Źródło:
Acta Physica Polonica A; 2013, 124, 2; 227-230
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of MPLS Tunnel Service L2TP-VPN Optimization Concept with Traffic Engineering Method for Looping-Protection Service Analysis
Autorzy:
Silalahi, Lukman Medriavin
Budiyanto, Setiyo
Simanjuntak, Imelda Uli Vistalina
Effendi, Rukhi Ali
Fernando
Rochendi, Agus Dendi
Kampono, Irfan
Powiązania:
https://bibliotekanauki.pl/articles/2201247.pdf
Data publikacji:
2023
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
MPLS
SR-TE
Looping Protection
L2-VPN
VPN
QoS
Opis:
This research began when observations were made on any-to-any-connection services that require QoS (Quality of Service) and tunnel measurements. Tunnel is a technique to interconnect between local networks that are separated through a public network. Research questions found looping caused by traffic issues when sending data in the MPLS service layer-2 tunneling service. Furthermore, this research hypothesis proposes optimizing QoS performance in the application of the SR-TE (Segment Routing-Traffic Engineering) method in the MPLS (Multi-Protocol Label Switching) network and analyzing traffic based on MAC addresses using the looping-protection method. This research contributes to optimizing the MPLS network and is a recommended solution for simplifying control-plane operation, especially the SR-TE method and looping-protection in the L2- VPN MPLS service. The purpose of this study is to analyze the performance of MPLS networks, as well as analyze the application of L2-VPN (Layer 2 Virtual Private Network) MPLS networks. The targeted TKT (Technology Readiness Level) is 3rd-Level, which is an analytical and experimental proof of the MPLS tunnel network model on Layer-2 VPN services. The results of the research concluded that testing the SR-TE method is a solution to simplify the process of labeling data traffic that is global labelling, then the looping-protection method is a solution to eliminate looping indications. The QoS obtained has also shown an "excellent" category based on TIPHON standards.
Źródło:
International Journal of Electronics and Telecommunications; 2023, 69, 1; 115--120
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyka i geneza złotonośnej mineralizacji arsenowo-polimetalicznej w złożu Czarnów (Sudety Zachodnie)
The characteristic and genesis of the gold-bearing arsenic polymetallic mineralization in the Czarnów deposit (Western Sudetes)
Autorzy:
Mikulski, S. Z.
Powiązania:
https://bibliotekanauki.pl/articles/2063090.pdf
Data publikacji:
2010
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
złoto
arsenopiryt
minerały Ag, Bi i Te
rudy
geochemia rud
izotopy siarki
geotermometria
Sudety
gold
arsenopyrite
Ag, Bi and Te minerals
ore
ore geochemistry
sulphur isotopes
geothermometry
Sudetes
Opis:
Szczegółowe badania geochemiczno-mineralogiczne okruszcowanych skał ze złoża w Czarnowie wykazały obecność kilku różniących się składem i teksturą złotonośnych typów rud siarczkowo-polimetalicznych, występujących w żyle kwarcowej, jak również w skałach ją otaczających (łupki, amfibolity i skały węglanowo-krzemianowe). Średnia zawartość złota w zbadanych próbkach wynosi ok. 1,1 ppm arsenu i miedzi, odpowiednio 5,6 i 0,75% (n = 47). Zakres koncentracji złota w próbkach rud siarczkowych jest od ok. 1 do 2,5 ppm (maks. 12,6 ppm), przy zawartości As 3–15% i Cu 1–4%. W masywnych rudach arsenopirytowych koncentracje As mogą osiągać ok. 20–30%. W rudach polimetalicznych udokumentowano pojedyncze wysokie koncentracje Ag (380 ppm), Bi (0,55%) i Sn (0,4%). Krystalizacja złota przebiegała w co najmniej dwóch etapach. Pierwszy związany był z precypitacją złota submikroskopowego (1 µm śred.), w paragenezie z siarczkami metali podstawowych, minerałów Bi, Au, Ag i Te oraz krystalizacją kwarcu mleczno-białego w temperaturze 250–320°C. Następny etap okruszcowania zaznaczył się precypitacją przezroczystego kwarcu, młodszej generacji kalcytu, galeny oraz różnych siarkosoli, w temperaturach od 210 do 130°C. Najmłodszy etap mineralizacji związany był z procesami hipergenicznymi, co przejawia się zastępowaniem siarczków przez minerały wtórne. Geneza okruszcowania złotonośnego w złożu związana była z co najmniej dwoma oddzielnymi procesami precypitacji kruszców z roztworów hydrotermalnych pochodnych procesom magmowo-tektonicznym w strefie kontaktu granitoidów Karkonoszy ze skałami jej wschodniej osłony metamorficznej. Źródłem arsenu, miedzi, siarki (δ S34 CDT w siarczkach w zakresie od 0,07 do 4,33‰) i innych metali były oprócz waryscyjskich granitoidów również skały związane z dolnopaleozoiczną aktywnością magmowo-wulkaniczną w jednostce Kowar-Czarnowa. Po raz pierwszy w złożu rozpoznano następujące minerały: argentyt, joseit, matyldyt, treasuryt, stannin oraz najprawdopodobniej hessyt i protojoseit.
Detailed geochemical-mineralogical studies of ore samples from the Czarnów deposit revealed the presence of ores with different composition and texture of gold-bearing sulphide polymetallic ores. They are hosting by quartz vein and its country rocks (schists, amphibolites and calc-silicate rocks). An average content of Au is 1.06 ppm, of As – 5.6% and of Cu – 0.75% (n = 47). The range of gold contents in sulphide ores is from 1 to 2.5 ppm (max. 12.6 ppm) at As contents 3 to 15% and Cu 1 to 4%. In massive arsenopyrite ore As concentration reaches up to 20–30%. In polymetallic ores a single high contents of Ag (max. 380 ppm), Bi (max. 0.55%) and Sn (max. 0.4%) were documented. Gold precipitation underwent at least in 2 separate stages. The first one was connected with submicroscopic gold (<1 μm in size) mostly bound in arsenopyrite and minor in pyrrhotite in the range of a high temperature (380– 490°C) determined by application of the arsenopyrite geothermometer and of fluid inclusions study of grey and/or grey-white quartz (330– 420°C). The second stage was related to gold redistribution from arsenopyrite and precipitation of microscopic gold (>1μmin size) in paragenetic association with base metal sulphides, and Bi, Au, Ag and Te minerals and crystallization of milky-white quartz in the temperature range 250–320°C. Next stage of ore precipitation was connected with crystallization of transparent quartz and younger generation of calcite, associated by galena and variable composition sulphosalts, in temperature range 130–210°C. The youngest stage is connected with weathering processes and is marked by replacement of primary sulphides by secondary minerals. Genesis of auriferous mineralization in the Czarnów deposit was related to at least two separate stages of ore minerals precipitation from hydrothermal fluids connected with post-magmatic-tectonic evolution of the Karkonosze granite along its contact with the Eastern metamorphic cover. Source of gold, arsenic, copper, sulphur (δ S34 CDT in sulphides range from 0.07 to 4.33‰), and other metals, beside Variscan granites, were credibly rocks related to Lower Paleozoic magmatic-volcanic processes in the Kowary–Czarnów unit. For the first time the following minerals have been recognized in the deposit: argentite, joseite, matildite, treasurite, stannite and most probably hessite and protojoseite.
Źródło:
Biuletyn Państwowego Instytutu Geologicznego; 2010, 439 (2); 303--320
0867-6143
Pojawia się w:
Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 52

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