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Tytuł:
Tectonic discrimination of siliciclastic sedimentary record of the northern Tethyan margin at the end of the Triassic
Autorzy:
Vďačný, Marek
Michalík, Josef
Lintnerová, Otília
Powiązania:
https://bibliotekanauki.pl/articles/2058608.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
sedimentology
geodynamics
major elements
trace elements
palaeogeography
Opis:
Tectonic setting of both the uppermost Triassic Tomanová and the lowermost Jurassic Dudziniec formations can be characterized by a series of diagnostic discrimination diagrams. High-silica and low-silica multi-dimensional diagrams indicate that the sediments could have been deposited in the continental collision/rift setting. Diagrams of K2O/Na2O versus SiO2, SiO2/Al2O3 versus K2O/Na2O and Th-Co-Zr/10 as well as Th-Sc-Zr/10 determine an origin from the tectonically active and/or passive continental margin setting. REE parameters indicate predominantly a passive margin tectonic setting of the sediments. The most probable source of clastic admixture in the Scythian to Domerian sediments in the Tatric Unit was situated in a remnant of the Variscan collisional orogen - the Vindelician Highlands. Occasional monsoonal rains occurring in orbitally controlled cycles transported weathered material from the source area down river valleys on the seaward slopes of the Variscan Vindelician Mountains towards the Tethyan Sea. The input of this material influenced also the marginal parts of the Fatricum (e.g., Vysoká or Havran units).
Źródło:
Geological Quarterly; 2019, 63, 1; 30--38
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Vertical distribution patterns of trace and major elements within soil profile in Lithuania
Autorzy:
Gregorauskiene, V.
Kadunas, V.
Powiązania:
https://bibliotekanauki.pl/articles/2058924.pdf
Data publikacji:
2006
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Lithuania
complete soil profile
accumulative elements
removable elements
total element contents
variability
Opis:
The vertical distribution of the total contents assayed by Dc-Arc ES analysis of 28 trace elements and 6 major elements measured by ICP-MS within 53 complete soil profiles in Lithuania are presented. Models of the soil profiles were created, each having the master soil horizons A, E, B and C. Median values of elements in the master horizons of different texture were used in place of missing samples, while aberrant samples were discarded. The absolute average deviation () was taken to measure the variability of the data subsets and thus to check the reliability of location of the element contents within the soil profile. Within the context of the different actions of the various soil-forming processes (podzolization, lessivage, gleyfication, humification and so on) the general patterns of vertical element distribution were revealed. Element depletion is dominant in the soils of Lithuania. Themost easily removed are the alkaline elements Ca and Mg, while U, B, Th, As, Co, Cr, Sr, Y, Mo, La, Sc, Yb, Ti, P and K are depleted through the whole soil profile. Ag, Pb, Sn and Mn were defined as the accumulative elements in the surface A-horizon and might be influenced by anthropogenic or biogenic processes. A relative accumulation of Zr, Ba and Nb was observed in the surface A-horizon, and this seems to be related to the weathering of resistant minerals. Levels of Fe, Li, Al, V, Zn, Ga, Ni, Cu and Rb were ascribed to elements precipitated in the soil illuvial B-horizon due to soil formation processes. Na, K, Sr, B, U, As, Co Rb and Yb were found to be the most immobile elements within typical soil profiles, while Ag, Zn, Sc, Ba, Cu, Zr, Fe La, Th and Ca are themostmobile elements and affected by a variety of natural and human factors.
Źródło:
Geological Quarterly; 2006, 50, 2; 229-237
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Indium in polymetallic mineralisation at the Gierczyn mine, Karkonosze-Izera Massif, Poland : results of EPMA and LA-ICP-MS investigations
Autorzy:
Foltyn, Krzysztof
Bertrandsson Erlandsson, Viktor
Kozub-Budzyń, Gabriela Anna
Melcher, Frank
Piestrzyński, Adam
Powiązania:
https://bibliotekanauki.pl/articles/2058542.pdf
Data publikacji:
2020
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Gierczyn
indium
trace elements
metamorphism
Opis:
Cassiterite and base-metal mineralisation from the Gierczyn mine on the Karkonosze-Izera Massif, Poland has been studied using electron microprobe and LA-ICP-MS (Laser Ablation Inductively Coupled Plasma Mass Spectrometry) techniques in order to determine the content of indium in the ore minerals. The main carriers of this element are sphalerite (up to 433 μ/g of In), chalcopyrite (up to 117 μ/g of In) and cassiterite (up to 0.02 wt.% In). Trace element contents of sulphides, especially Ga in chalcopyrite intergrown with sphalerite in comparison with chalcopyrite without sphalerite, may indicate metamorphic re-equlibration and suggests that the ore minerals might recrystallized and underwent metamorphism in conditions of greenschist/amphibolite facies. Although the deposits in the Stara Kamienica Schist Belt are not of economic value, they can contribute to better understanding of the relations between trace element partitioning and the formation of ore minerals.
Źródło:
Geological Quarterly; 2020, 64, 1; 74--85
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical and morphological characterization of polymetallic (Mn-Fe) nodules from the Clarion-Clipperton Zone in the Pacific Ocean
Autorzy:
Kozłowska-Roman, Agata
Mikulski, Stanisław
Powiązania:
https://bibliotekanauki.pl/articles/2058694.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
polymetallic nodules
critical elements
rare earth elements
deep-sea mining
Clarion-Clipperton Fracture Zone
Pacific
Opis:
Geochemical studies (WD-XRF, ICP-MS, and GF-AAS) have shown that polymetallic nodules from the eastern Clarion-Clipperton Zone (CCZ) in the Pacific Ocean are enriched in several metals such as Cu (mean 1.16%), Ni (1.15%), Co (0.15%), and Zn (0.14%), as well as remarkable contents of Mo (0.059%), V (0.04%), Ce (0.019%), Nd (0.011%), Li (0.015), and Pt (43 ppb). The average content of REE, together with Y and Sc, is 620 ppm. In nodules from the CCZ metal concentrations are often much higher than those reported in nodules from other ocean basins in the world. The bulk-nodule mean value of the Mn/Fe ratio is 5.3, which is characteristic for a mixed (hydrogenetic and diagenetic) origin of the nodules. Microprobe investigation revealed two different chemical compositions of the layers, and ascertained their general metal content. The nodules analyzed are composed mainly of concentric-collomorphic laminae of Mn and Fe (oxy)hydroxides which crystallized around mineral nuclei (e.g., quartz, clay minerals), bioclasts or rock fragments. They are from 3.3 to 7.6 cm in diameter. The chemical and physical properties of the laminae allowed distinction of two genetic types: hydrogenetic and diagenetic. Those formed as a result of hydrogenesis had increased values of Co, Si, Cl and S, while formed diagenetically showed increased levels of Cu, Ni, Mg, Zn and K. These lamina types are characterized by different growth structures, reflectivity, density and Mn/Fe ratios. The ratio of the diagenetic layers to hydrogenetic layers (192/53) in representative polymetallic nodules shows that the nodules of this study are of mixed hydrogenetic-diagenetic type. A mixed genesis was also shown by discriminant diagrams, with these CCZ samples being located at the transition between typical hydrogenetic and diagenetic fields.
Źródło:
Geological Quarterly; 2021, 65, 4; 177--194
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical composition of soil and lake sediments - an indicator of geological processes in Lithuania
Autorzy:
Gregorauskiene, V.
Kadunas, V.
Powiązania:
https://bibliotekanauki.pl/articles/2059444.pdf
Data publikacji:
2000
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Lithuania
trace elements
soil
lake sediments
geoindicators
Opis:
Long-term multipurpose geochemical studies in Lithuania show that the chemical composition of surface sediment can be used as an indicator of geological process: duration of weathering, soil formation and thickness of sediment. The chemical composition of upper and lower soil layers and of lake sediments gives information on past sedimentation: the type and age of Quaternary deposits and the location and depth of Pleistocene glaciolacustrine basins. We therefore have a baseline to predict changes in surface chemistry provoked by current anthropogenic pressures.
Źródło:
Geological Quarterly; 2000, 44, 4; 347-354
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lithologically-related rare earth element variations the Mio-Pliocene Poznań Formation (Poland)
Autorzy:
Retka, J.
Powiązania:
https://bibliotekanauki.pl/articles/2059369.pdf
Data publikacji:
2018
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Poznań Formation
rare earth elements
clay lithotypes
Opis:
Concentrations of rare earth elements (REEs) were determined in 129 clay samples collected from the Mio-Pliocene Poznań Formation in Poland. The REEs occur in a relatively wide range from 58.2 to 1,709 mg/kg. Low North American Shale Composite (NASC)-normalized total REE contents with heavy rare earth element (HREE) depletion were noted in most of the samples analysed. Small variations were detected in the REE contents in the lithologies distinguished. Red clays are characterised by slightly lower REE concentrations relative to green and grey clays. All the Poznań Formation clays exhibit a negative Eu anomaly when normalized to the average of chondrites. Values increase according to the following sequence: grey clays < red clays < green clays. The NASC-normalized REE concentration curves show a positive Eu anomaly. The LaNASC/YbNASC ratio indicates HREE depletion. A small variation in this ratio was observed in the sequence green clays > grey clays > red clays. The variability of the REE contents of the Poznań Formation decreased from west to east.
Źródło:
Geological Quarterly; 2018, 62, 1; 146--154
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Controls on the distribution of rare earth elements in the Kupferschiefer series of SW Poland
Autorzy:
Oszczepalski, S.
Chmielewski, A.
Mikulski, S.
Powiązania:
https://bibliotekanauki.pl/articles/2060523.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
rare earth elements (REE)
redistribution
Kupferschiefer
Zechstein
SW Poland
Opis:
This study deals with the spatial distribution and the PAAS-normalized patterns of rare earth elements (REE) studied by ICP-MS in the Kupferschiefer series of SW Poland. The most characteristic feature is a progressive enrichment in REE content (including Y and Sc) outward from the rocks with pyritic and Pb-Zn mineralisation, across the rocks with copper mineralisation, towards the oxidized (Rote Fäule) areas. The same trend can also be observed with respect to LREE, MREE and HREE. Whereas REE distribution diagrams for shales with pyrite and Pb-Zn mineralisation are almost flat, diagrams for shales with hematite and copper mineralisation are convex-upward and the strongest convexity is attributed to the transition from hematitic alteration to copper-rich rocks. REE distribution diagrams normalized to PAAS show strong MREE enrichment relative to LREE and HREE, which is typically the highest in the hematite zone, lower in shale with copper mineralisation, and the lowest in shales with Pb-Zn and pyrite mineralisation. The systematic increase in the concentration of REE towards the Rote Fäule, and the strong enrichment in MREE in the transition zone are indicative of variable intensity of leaching and formation of the REE enrichments (including MREE) by MREE>HREE>LREE fluids, as evidenced by the MREE-enriched signatures. Overprinting of secondary enrichments over the original REE pattern due to redistribution along the pathways of expanding fluids are postulated to account for the apparent differences in the distribution and concentration of REE (including the MREE-enriched trend) between the oxidized rocks, copper-bearing rocks, and reduced lithologies barren in copper.
Źródło:
Geological Quarterly; 2016, 60, 4; 811--826
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pierwiastki śladowe w osadach rzeki Brdy w Bydgoszczy
Trace elements in sediments of the Brda river in Bydgoszcz
Autorzy:
Bojakowska, I.
Wołkowicz, S.
Dobek, P.
Powiązania:
https://bibliotekanauki.pl/articles/2062742.pdf
Data publikacji:
2012
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
pierwiastki śladowe
zanieczyszczenie
Brda
trace elements
pollution
Brda River
Opis:
Na terenie Bydgoszczy z rzeki Brdy pobrano próbki osadów z 22 stożków nasypowych, powstałych przy wylotach kanałów ściekowych, którymi odprowadzano ścieki do rzeki. Z każdego stożka pobrano jedną uśrednioną próbkę, którą uzyskano przez połączenie od 4 do 9 pełnej miąższości rdzeni pobranych w różnych miejscach stożka. W próbkach oznaczono zawartość As, Ba, Cr, Pb, Co, Cu, Ni, Sn i Zn metodą ICP-OES oraz Hg metodą AAS z zatężaniem na amalgamatorze. Maksymalne zawartości pierwiastków wynosiły: Ba – 233 mg/kg, Cd – 6,9 mg/kg, Cr – 255 mg/kg, Cu – 231 mg/kg, Hg – 2,72 mg/kg, Ni – 36 mg/kg, Pb – 301 mg/kg, Sn – 19 mg/kg i Zn – 507 mg/kg. Przekroczenie dopuszczalnych zawartości Hg, Pb, Cr, Cu według Rozporządzenia MŚ o osadach bagrowniczych (Rozporządzenie, 2002a) stwierdzono w 11 stożkach nasypowych. Oszacowano, że w stożkach nasypowych utworzonych przy wylotach kanałów ściekowych nagromadziło się około 8,6 tys. m3 osadów dennych, z których około 4,5 tys. m3 stanowiły osady niezanieczyszczone, które mogły być relokowane w obrębie akwenu wodnego, a około 4,1 tys. m3 stanowiły osady zanieczyszczone.
In the city of Bydgoszcz, sediment samples were taken from 22 embankment cones in the Brda River, formed near the outlets of sewers through which waste water was discharged into the river. One averaged sample, which was obtained by combining 4 to 9 full-thickness cores taken at different locations of the cone, was collected from each cone. The samples were analysed for As, Ba, Cr, Pb, Co, Cu, Ni, Sn and Zn contents by the ICP-OES method, and for Hg content using the AAS method with pre-concentration on a gold amalgamate trap. The maximum levels of individual elements were as follows: Hg – 2.72 mg/kg, Cd – 6.9 mg/kg Cr – 255 mg/kg, Sn – 19 mg/kg, Zn – 592 mg/kg, Cu – 231 mg/kg, Ni – 74 mg/kg, Pb – 301 mg/kg, and Ba – 233 mg/kg. The concentrations exceeding permissible limits of Hg, Pb, Cr, Cu, according to the Decree of the Minister of the Environment (Rozporządzenie, 2002) for dragged sediments, were found in 11 embankment cones. It was estimated that the embankment cones set up at the mouths of the sewers have accumulated about 8.6 thousand m3 of sediments, of which about 4.5 thousand m3 of sediments were uncontaminated and could be relocated within the body of water, and about 4.1 thousand m3 of sediments were contaminated.
Źródło:
Biuletyn Państwowego Instytutu Geologicznego; 2012, 450; 27--33
0867-6143
Pojawia się w:
Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zróżnicowanie zawartości pierwiastków śladowych w osadach torfowisk Otalżyno, Huczwa i Stoczek
Variability of trace element concentrations in the deposits of the Otalżyno, Huczwa and Stoczek peat bogs
Autorzy:
Bojakowska, I.
Tołkanowicz, E.
Powiązania:
https://bibliotekanauki.pl/articles/2061896.pdf
Data publikacji:
2015
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
torf
pierwiastki śladowe
Otalżyno
Huczawa
Stoczek
peat
trace elements
Huczwa
Opis:
Badaniom poddano torfy z trzech torfowisk (torfowiska wysokiego Otalżyno oraz torfowisk niskich Huczwa i Stoczek). W próbkach torfu, po ich pełnym kwasowym roztworzeniu, określono zawartość pierwiastków śladowych (Li, Be, As, Se, Rb, Ag, Sb, Cs, Tl, Th, U, Ba, Cd, Co, Cr, Cu, Hg, Mo, Ni, Pb, Sn, Sr, Ti, V i Zn) i głównych (Al, S, Ca, Fe, K, Mg, Mn, Na, P i TOC). Najniższą zawartością pierwiastków śladowych odznaczały się torfy z torfowiska Otalżyno, a najwyższą – torfy z torfowiska Stoczek. Zróżnicowanie stężenia pierwiastków jest ściśle związane ze składem chemicznym skał występujących na terenach przyległych. Zawartość pierwiastków śladowych wykazuje wysoką korelację z zawartością Al, Fe i S, niższą z P, jeszcze niższą z Ca, a najniższą z TOC.
Studies of peat from three peat bogs (Otalżyno bog, Huczwa and Stoczek fens) were conducted. In peat samples, after the total acid digestion, the content of trace (Li, Be, As, Se, Rb, Ag, Sb, Cs, Tl, Th, U, Ba, Cd, Co, Cr, Cu, Hg, Mo, Ni, Pb, Sn, Sr, Ti, V and Zn) and major (Al, S, Ca, Fe, K, Mg, Mn, Na, P and TOC) elements were determined. The lowest contents of trace elements were found in the raised peat bog Otalżyno. The peat from the Stoczek fen shows the highest contents of trace elements. Differences in the content of elements in the peat are strictly dependent on the chemistry of the rocks occurring in the area surrounding the bog. Trace elements display a significant correlation with the content of Al, Fe and S, a weaker correlation with P, even slightly weaker with Ca, and the weakest with TOC.
Źródło:
Biuletyn Państwowego Instytutu Geologicznego; 2015, 464; 5-16
0867-6143
Pojawia się w:
Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trace element geochemistry of the Early to Late Cretaceous deposits of the Grajcarek thrust-sheets - a palaeoenvironmental approach (Małe Pieniny Mts., Pieniny Klippen Belt, Poland)
Autorzy:
Wójcik-Tabol, P.
Oszczypko, N.
Powiązania:
https://bibliotekanauki.pl/articles/2058965.pdf
Data publikacji:
2012
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Western Carpathians
Grajcarek thrust-sheets
black flysch
trace elements geochemistry
Opis:
The chemical composition of the Cretaceous deposits of the Grajcarek thrust-sheets (Pieniny Klippen Belt, Poland) has been investigated to provide information on palaeoenvironment and provenance of pelagic and turbiditic particles. The material studied shows large variations in terrigenous and biogenic content. Phyllosilicates (mirrored in amounts of Al2O3, average 15 wt.%) and carbonates (6 wt.% of CaO) are common mineral components of the deposits excluding the Cenomanian radiolarian shales (CRS) that are enriched in silica "Immobile" elements may be accommodated by phyllosilicates and accessory minerals (i.e. zircon, xenotime, apatite and Ti-oxides). Heavy minerals are significant within the Szlachtowa Fm. High field strength elements (HFSE) in the Malinowa Fm. are housed in secondary apatite and Fe-oxides. Lithophile trace elements (LILE) concentrations in the material studied are lower/comparable to Post-Archean Australian Shale (PAAS). Ba concentration in the CRS probably reflects enhanced bioproductivity. Interaction between major oxides, distributions of "immobile' and lithophile elements suggest that variation in trace elements through the succession was mainly controlled by the terrigenous input. The material studied was sourced from intermediate to felsic rocks of the Czorsztyn (Oravic) Ridge. The Szlachtowa Fm. and CRS are more mature than others due to low contents of clay minerals. The Szlachtowa Fm. also contains recycled material. The CRS correspond to the oceanic anoxic event 2 (OAE 2) whereas the "Black Flysch" of the Szlachtowa and Opaleniec formations may be related to the Early Cretaceous OAE 1
Źródło:
Geological Quarterly; 2012, 56, 1; 169-186
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geochemical signatures of pervasive meteoric diagenesis of Early Miocene syn-rift carbonate platform, Red Sea, NW Saudi Arabia
Autorzy:
Al-Ramadan, K.
Powiązania:
https://bibliotekanauki.pl/articles/2060345.pdf
Data publikacji:
2017
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
meteoric diagenesis
carbonate
stable isotopes
trace elements
Red Sea
Miocene
Opis:
Different diagenetic environments have been recognized in the Early Miocene carbonate platform of Musayr Formation in the Red Sea rift area. Early marine diagenesis includes micritisation that occurs as thin envelope around skeletal and non-skeletal grains in low-energy mud dominated facies and isopachous fibrous calcite in high-energy grain-dominated facies. Pervasive meteoric water diagenesis resulted in cementation of the carbonates by coarse-crystalline blocky-drusy calcite and meniscus cements. Depletion of oxygen (avg. –9.08‰), carbon (avg. –1.6‰) isotopes and trace elements concentrations (avg. values of Fe: 1387 ppm; Mn: 1444 ppm; Sr: 419 ppm; Na: 1194 ppm) in conjunction with negative correlation between Mn2+ and oxygen isotope data suggest variable degrees of fluid-rock interactions and pervasive meteoric diagenesis. The formation of meteoric diagenesis in the Musayr Formation can be explained by two subsequent mechanisms: (1) the presence of meteoric lenses during the time of deposition might have been associated with active freshwater input from the hinterland (NE) due to fall in the relative sea level; (2) later uplift episode during Plio-Pleistocene may have also contributed to the pervasive meteoric diagenetic alterations of the carbonates of the Musayr Formation. The first mechanism is supported by the cement stratigraphy where the blocky-drusy cements postdate the meniscus cement. The latter mechanism seems to have more pronounced effect on the alteration of Musayr carbonate sequence by observing the occurence of late cements such as blocky calcite in most of the samples. The impact of meteoric diagenesis on the studied samples suggest that dissolution is less severe than cementation, hence the visible porosity is very low. Understanding the timing of meteoric diagenesis provides useful information about the reservoir quality distribution in syn-rift carbonate sequences.
Źródło:
Geological Quarterly; 2017, 61, 1; 239--250
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Podiform chromitites from the Variscan ophiolite serpentinites of Lower Silesia (SW Poland) : petrologic and tectonic setting implications
Autorzy:
Wojtulek, P. M.
Puziewicz, J.
Ntaflos, T.
Bukała, M.
Powiązania:
https://bibliotekanauki.pl/articles/2060165.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
ophiolite
chromitite
platinum group elements
PGE
supra-subduction setting
Variscan orogeny
Opis:
The Gogołów-Jordanów Serpentinite Massif (GJSM) and the Braszowice-Brzeźnica Massif (BBM) are the largest serpentinite outcrops in the Fore-Sudetic Block (NE part of the Bohemian Massif, Central Europe). The GJSM is a peridotitic member of the Variscan Ślęża Ophiolite (SW Poland). Podiform bodies (veins and pockets) of chromitite are found on the Czernica Hill (GJSM) and on the Grochowiec Hill (BBM) within strongly serpentinized harzburgites which occur several hundred metres below Paleo-Moho. Chromitites consist of rounded chromite grains up to 3 cm across, and of chlorite filling the interstices. The veins are embedded in serpentine-olivine-chlorite aggregates. Relics of Mg-rich olivine (Fo95-96) occur in massive chromitite in the BBM. The bulk-rock total PGEs content is very low (42-166 ppm) and the PGE pattern is negatively sloped towards Pt and Pd and depleted relative to chondrite. The primary chromite I is aluminous (Cr# 0.50-0.52, Mg# 0.60-0.70). The highly aluminous and magnesian (Cr# 0.38, Mg# 0.80) chromite Ia occurs locally in the BBM. The secondary chromite II is enriched in Cr and impoverished in Al (Cr# 0.57-0.69), it replaces chromite I. Both chromite I and II contain small amounts of Ti (<0.14 wt% TiO2). Silicate inclusions in chromite are scarce. The composition and mode of occurrence of both the GJSM and the BBM chromitites are similar, thus they were formed probably under the same conditions. Textures of the chromitites suggest their magmatic origin. Their current geological position indicates their emplacement and crystallization in the uppermost mantle harzburgites occurring below the Moho Transition Zone (MTZ). The chromitites and hosting harzburgites were subjected to the greenschist-facies metamorphic overprint. The moderate Cr# and low PGEs contents suggest that the chromitites originated in the arc setting, thus their host ophiolite is of supra-subduction type.
Źródło:
Geological Quarterly; 2016, 60, 1; 56--66
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The stability of xenotime in high Ca and Ca-Na systems, under experimental conditions of 250–350°C and 200–400 MPa : the implications for fluid-mediated low-temperature processes in granitic rocks
Autorzy:
Budzyń, B.
Kozub-Budzyń, G. A.
Powiązania:
https://bibliotekanauki.pl/articles/2060298.pdf
Data publikacji:
2015
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
xenotime
yttrium fluorapatite
yttrium silicate
rare earth elements (REE)
experimental petrology
Opis:
he stability of xenotime was tested by experiments in the presence of a silicate mineral assemblage and two different fluids, 2M Ca(OH)2 or Na2Si2O5 + H2O, under P-T conditions of 200-400 MPa and 250-350°C. The xenotime was stable in runs with 2M Ca(OH)2, replicating the low-temperature metasomatic alterations of granitic rocks, except in experiment at 350°C and 400 MPa, where some (Y,REE)-rich fluorapatite formed. Experiments with Na2Si2O5 + H2O resulted in significant xenotime alteration and partial replacement by an unknown (Y,HREE)-rich silicate, and in the formation of minor amounts of (Y,REE)-rich fluorapatite. The latter indicate preferential partitioning of Y and REE into silicates over phosphates during low-temperature, metasomatic processes in a high Na-Ca system, similar to peralkaline granitic rocks.
Źródło:
Geological Quarterly; 2015, 59, 2; 316-324
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rozwój technologiczny w energetyce jądrowej i jego wpływ na zapotrzebowanie na surowce rozszczepialne
Development in nuclear energy power technologies and its effect on fissile materials demand
Autorzy:
Chmielewski, A.G.
Powiązania:
https://bibliotekanauki.pl/articles/2062655.pdf
Data publikacji:
2010
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
uran
tor
światowe zasoby pierwiastków rozszczepialnych
uranium
thorium
fissile elements worldwide reserves
Opis:
W artykule w skrócie omówiono informacje dotyczące światowych zasobów surowców rozszczepialnych, w świetle rozwoju technologicznego energetyki jądrowej. Wskazano też na możliwości wykorzystania toru i podkreślono rolę zamkniętego cyklu paliwowego w dalszym rozwoju energetyki jądrowej. Przedstawiono także możliwości uzyskiwania uranu z surowców ubogich w ten pierwiastek.
Data regarding worldwide fissile elements reserves from the point of view of nuclear technology development are presented in the paper. The possibilities of thorium application as a fissile fuel and role of closed cycle (fuel reprocessing) in the further nuclear power development are discussed as well. The possibility of low grade ore and waste streams for uranium recovery is presented finally.
Źródło:
Biuletyn Państwowego Instytutu Geologicznego; 2010, 439 (1); 77--80
0867-6143
Pojawia się w:
Biuletyn Państwowego Instytutu Geologicznego
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pierwiastki śladowe w pyłach tuneli drogowych na terenie Warszawy
Trace elements in dust samples from Warsaw road tunnels
Autorzy:
Bojakowska, I.
Duszyński, J.
Jaroń, I.
Karmasz, D.
Kucharzyk, J.
Maksymowicz, A.
Powiązania:
https://bibliotekanauki.pl/articles/2074669.pdf
Data publikacji:
2009
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
pierwiastki śladowe
pyły
tunele drogowe
zanieczyszczenie
pollution
trace elements
dust
road tunnels
Opis:
The contents of Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, S, V and Zn in road dust samples taken from the inside of seven road tunnels in the area ofWarsaw by ICP-OES technique were quantified. These deposits are characterized by high content of copper (ranging from 44 to387 mg/kg) and contents of chromium (15–36 mg/kg), nickel (9–17 mg/kg), lead (19–37 mg/kg) and zinc (101–258 mg/kg) increased in comparison to those typical of soils in the Polish Lowlands. In turn, the examined dust samples contain cadmium, cobalt and vanadium in concentrations close to the average for soils in this region.
Źródło:
Przegląd Geologiczny; 2009, 57, 12; 1069-1069
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 54

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