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Wyszukujesz frazę "Nasławice" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Rodingite from Nasławice (Jordanów-Gogołów massif) against the other occurrences of these rocks in Lower Silesia (SW Poland)
    Autorzy:
    Heflik, W.
    Natkaniec-Nowak, L.
    Dumańska-Słowik, M. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059965.pdf
    Data publikacji:
    2014
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    rodingite
    Nasławice
    polymetallic compounds
    mafic protholit
    Opis:
    Rodingites from Nasławice of the Jordanów-Gogołów serpentinite massif in SW Poland are mainly made of augite/diopside, grossular and hornblende/tremolite. The accessory components are represented by vesuvianite, adularia, basaltic hornblende and picotite. Apatite, millerite?, sphalerite, galena, Fe-sulphides, Ni-sulphides and Ni-arsenates were also observed as a trace phases in these rocks. Generally rodingites from Nasławice are enriched in numerous polymetallic compounds of Cu, Ag, Fe, Ni, Co, Fe, Pb, Zn, As and Bi and show similar mineral association and texture as rodingites from the other occurrences in SW Poland, i.e. from Szklary and Braszowice-Brzeźnica massives. They were the most probably developed from mafic protholit (diabase gabbro) intruding into serpentinized ultramafic rocks under metasomatism conditions. The secondary pneumo-hydrothermal post-granitic activities also affected the final formation of these metasomatic rocks.
    Źródło:
    Geological Quarterly; 2014, 58, 1; 31--40
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nefryt z Nasławic na Dolnym Śląsku
    Nephrite from Nasławice in Lower Silesia (SW Poland)
    Autorzy:
    Łobos, K.
    Sachanbiński, M.
    Pawlik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074569.pdf
    Data publikacji:
    2008
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    nefryt
    serpentynity
    rodingity
    masyw Gogołów-Jordanów
    ofiolit Ślęży
    nephrite
    serpentinites
    rodingites
    Ślęża ophiolite
    Opis:
    During exploitation of serpentinite in the Nasławice quarry (SW Poland) a nephritic zone has been identified. Nephrite occurs in association with light in color rock, similar to rodingite, composed almost entirely of garnet. These rocks form oval bodies in serpentinites. Their maximal length is 7 m and height is 3.5 m. Nephrite appears in the contact zone of one of such bodies. In the upper contact zone nephrite is 10-15 cm thick and in the west side of the rodingite body reaches 40-50 cm. It is possible to distinguish varieties of nephrite from the Nasławice quarry which differ according to color, fabric and mineral composition. Nephrite from Nasławice is hard and reveals splintery fracture. Nephrite is mainly composed of actinolite, which forms fine- grained aggregates (length of fibres ca 100 um) arranged chaotically. Additional minerals also occur such as chromite, garnet enriched in Cr and pyroxene. Microscopic examination reveals that nephrite has massive, fibrous texture. With regard to gemmological properties, three varieties of nephrite have been identified: 1) Homogenous green nephrite with a small amount of chromite inclusions, which cover no more than 5% of surface of sliced samples; 2) Spotted nephrite-with numerous dark spots on a green background; it happens occasionally, that this variety of nephrite changes into serpentinite; 3) Patchy nephrite- characterized by the presence of emerald-green, elongated spots of actinolite (often with grains of chromite inside) on a white background; some fragments contain veins of fibrous serpentine with cat’s eye effect; this seems to be the most interesting sort of nephrite from Nasławice. Based on preliminary technological studies it can be concluded, that nephrite from Nasławice has not only a fine color and interesting texture, visible in sliced samples, but it is also easy for polishing. On polished surfaces nephrite shows fine oily luster. Unfortunately, examples found today are strongly cracked because of the explosive method of serpentinite exploitation used in the Nasławice quarry. The zone of nephrite occurrence is associated with the course of veins of leucocratic rock which extends over a distance of ca 5 km between Nasławice and Jordanów Sląski.
    Źródło:
    Przegląd Geologiczny; 2008, 56, 11; 991-999
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Origin of serpentinite-related nephrites from Gogołów-Jordanów Massif, Poland
    Autorzy:
    Gil, G.
    Barnes, J. D.
    Boschi, Ch.
    Gunia, P.
    Szakmány, G.
    Bendő, Z.
    Raczyński, P.
    Péterdi, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059648.pdf
    Data publikacji:
    2015
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    nephrite
    serpentinite-related nephrite
    ortho-nephrite
    stable isotopes
    Gogołów-Jordanów Massif
    Jordanów
    Jordansmühl
    Nasławice
    Opis:
    The Gogołów-Jordanów Massif (GJM) in the Fore-Sudetic Block, SW Poland, hosts nephrites traditionally interpreted as serpentinite-related (ortho-nephrite). This contribution confirms the serpentinite-related origin of the nephrites on the basis of mineralogy, bulk-rock chemistry, and O and H isotopes. Rock-forming amphiboles from nephrites of the GJM have 7.73–7.99 Si apfu, comparable to 7.76–8.03 Si apfu of serpentinite-related Crooks Mountain nephrite amphibole (Granite Mountains, Wyoming, USA). The GJM amphiboles also have Mg/(Mg + Fe2+) values ranging from 0.82 to 0.94, similar to serpentinite-related Crooks Mountain and New Zealand nephrites amphiboles with Mg/(Mg + Fe2+) values of 0.86–0.90 and 0.91 to 0.92, respectively. The GJM nephrite amphiboles differ from the Val Malenco dolomite-related nephrite (Italy) amphibole, e.g., Val Malenco has a higher Si content (~8.0 Si apfu), although it overlaps with some of the GJM nephrite samples, and ~1.0 Mg/(Mg + Fe2+), also higher than the GJM samples. Also, apatite in the nephrite studied from the GJM has a slightly higher Ca content than apatite from dolomite-related nephrite. Chlorites found in the Jordanów nephrite have similar compositions to that of chlorites in the serpentinite-related nephrites and also to chlorites associated with serpentinisation/rodingitisation. The bulk-rock FeO vs. Fe/(Fe + Mg), Cr, Ni, and Co are also typical of the serpentinite-related nephrites. The d18O values range from +6.1 to +6.7‰ (±0.1‰), and the average dD values = –61‰, corresponding with the serpentinite-related nephrites range. Based on petrographic observations, we suggest four crystallisation stages (including rodingitisation prior to nephrite formation): 1 – leucogranite rodingitisation and black-wall formation; 2 – tremolite formation at the expense of rodingite diopside and black-wall chlorite (nephritisation) and garnet break-down, with spinel and chlorite formation (chlorite can be a product of garnet break-down or spinel with serpentine reaction); 3 – prehnite vein formation; 4 – tremolite formation at the expense of prehnite veins and actinolite veins formation. Spinels composed of 0.29–1.96 wt.% MgO, 24.87–29.67 wt.% FeO, 8.72–22.82 wt.% Fe2O3, 3.11–4.36 wt.% Al2O3, and 39.07–54.46 wt.% Cr2O3 suggest nephritisation in the greenschist to lower-amphibolite-facies conditions.
    Źródło:
    Geological Quarterly; 2015, 59, 3; 457--472
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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