Radiometric age analyses of rocks from the northern envelope of the Karkonosze massif, the Sudetes, Poland: a comparative geochronological study

• Autorzy: Jarmołowicz-Szulc K. , Halas S. , Wójtowicz A.
• Języki publikacji: PL

Abstrakty

EN

K-Ar determinations have been conducted on the background of the earlier radiometric data in the eastern part of the northern Karkonosze-Izera envelope of the granite massif, composed of different varieties of granites, gneisses and mica schists. The values of the K-Ar age for minerals and rocks from the Karkonosze-Izera block lie in the wide interval ranging from 226.0 ± 6.7 Ma to 386.1 ± 3.0 Ma. The K-Ar age data obtained by volumetric method oscillate between 308 ± 21 and 372 ± 26 Ma. Most biotite K-Ar age values of the Izera granite-gneisses complex give an average age of 316.1 ± 3.3 Ma. They correspond to the cooling age of the Karkonosze pluton while the data below 300 Ma are minimum age values that postdate the last granite intrusion of the Krkonoše-Jizera pluton. The obtained results over 300 Ma are mixed apparent ages between the age of the Karkonosze and the Izera granite ages. The K-Ar dates in the studied region have been compared with fission-track (FT) ages of zircon and titanite in the same area which display another distribution pattern.

Słowa kluczowe

EN

K-Ar; radiometric age; geochronology; Karkonosze-Izera Block

• Wydawca: De Gruyter
• Czasopismo: Geochronometria
• Rocznik: 2009
• Tom: Vol. 34
• Strony: 33--39
• Opis fizyczny: Bibliogr. 25 poz., rys.

Twórcy

autor

Jarmołowicz-Szulc K.

autor

Halas S.

autor

Wójtowicz A.

• Polish Geological Institute - National Research Institute, ul. Rakowiecka 4, 00-975 Warszawa, Poland,

Bibliografia

• Aleksandrowski P and Mazur S, 2002. Collage tectonics in the northeasternmost part of the Variscan Belt: the Sudetes, Bohemian Massif. In: Winchester JA, Pharaoh TC and Verniers J, Eds., Amalgamation of Central Europe. Geological Society Special Publications 201: 237-277.
• Białek D, 1999. Chemical changes associated with deformation of granites under greenschist facies conditions: the example of the Zawidów Granodiorites (SE Lusitian Granodiorite Complex, Poland). Tectonophysics 303: 251-261, DOI 10.1016/S0040-1951(98)00248-0.
• Borkowska M, Hameurt J and Vidal P, 1980. Origin and age of Izera gneisses and Rumburk granites in the Western Sudetes. Acta Geologica Polonica 30: 121-145.
• Borucki J, 1966. Wstępne wyniki datowań bezwzględnych K-Ar granitoidów dolnośląskich. (Preliminary results of absolute K-Ar dating of the Lower Silesia granitoids). Kwartalnik Geologiczny 10: 1-18 (in Polish).
• Duthou JL, Couturie JP, Mierzejewski MP and Pin C, 1991. Next dating of granite sample from the Karkonosze Mountains using Rb-Sr total rock isochrone method (in Polish with English summary). Przegląd Geologiczny 36: 75-79.
• Hałas S, 1995. Geochronologia izotopowa oparta na rozpadzie promieniotwórczym potasu-40. (Isotope geochronology based on radioactive decay of potassium-40). Przegląd Geologiczny 43: 993-998 (in Polish).
• Jarmołowicz-Szulc K, 1984. Geochronologiczne studium części północnej osłony granitu Karkonoszy za pomocą metod trakowych. Archiwum Mineralogiczne 39: 139-183.
• Korytowski A, Dörr W and Żelaźniewicz A, 1993. U-Pb dating of (meta-) granitoids in the NW Sudetes (Poland) and their bearing on tectonostratigraphic correlation. Terra Nova 5, Abstract Supplement no 1: 331-332.
• Kröner A, Hegner E, Hammer J, Haase G, Bielicki K-H, Krauss M and Eidam J, 1994. Geochronology and Nd-Sr systematics of Lusatian granitoids: significance for the evolution of the Variscan orogen in east-central Europe. Geologische Rundschau 83: 357-376.
• Machowiak K and Armstrong R, 2007. SHRIMP U-Pb zircon age from the Karkonosze granite. Mineralogia Polonica Special Papers 31:193-196.
• Maluski H and Patočka F, 1997. Geochemistry and 40Ar-39Ar geochronology of the mafic metavolcanic rocks from the Rýchory Mountains complex (west Sudetes, Bohemian Massif): paleotectonic significance. Geological Magazine 134: 703-716.
• Marheine D, Kachlik V, Maluski H, Patočka F and Żelaźniewicz A, 2002. The 40Ar/39Ar ages from the West Sudetes (NE Bohemian Massiv): constraints on the Variscan polyphase tectonothermal development. In: Winchester JA, Pharaoh TC and Verniers J, Eds., Amalgamation of Central Europe. Geological Society Special Publications 201: 133-155.
• Mierzejewski MP, Pin C, Duthou JL and Couturie JP, 1994. Sr-Nd isotopic study of the Karkonosze granite (Western Sudetes). In: Kryza R, Ed., Igneous activity and metamorphic evolution of the Sudetes area. Abstracts. Wrocław University. 82.
• Mikulski SZ and Stein H, 2007. Re-Os age for molybdenite from the West Sudetes, SW Poland. Graintoids in Poland, AM Monograph 1: 203-216.
• Mochnacka K, Oberc-Dziedzic T, Mayer W and Pieczka A, 2008. Ti remobilization and sulphide/ sulphoarsenide mineralization in amphibolites: effect of granite intrusion (the Karkonosze-Izera Massif, SW Poland). Geological Quarterly 52: 349-368.
• Oberc J, 1972. Budowa Geologiczna Polski, t. 4., Tektonika, cz. 2, Sudety i obszary przyległe (Geological structure of Poland. Vol. 4, Tectonics, Part 2, Sudetes and the adjacent area). Wydawnictwa Geologiczne. Warszawa (in Polish): 307 pp.
• Oberc-Dziedzic T, 1988. The development of gneisses and granites in the eastern part of the Izera crystalline unit in the light of the textural investigations. Acta Universitatis Wratislaviensis 997; Prace Geol-Miner 13:1-184. (in Polish with English summary).
• Oberc-Dziedzic T, Pin C and Kryza R, 2005. Early Palaeozoic crustal melting in an extensional setting: petrological and Sm-Nd evidence from the Izera granite-gneisses, Polish Sudetes. International Journal of Earth Sciences 94: 354-368, DOI 10.1007/s00531-005-0507-y.
• Oberc-Dziedzic T, 2007. Early Palaezoic Izera (Rumurk) granites from West Sudetes, Poland, Graintoids in Poland, AM Monograph 1: 101-110.
• Oliver GHJ, Corfu F and Krogh TE, 1993. U-Pb ages from SW Poland: evidence for a Caledonian suture zone between Baltica and Gondwana. Journal of Geological Society 150: 355-369, DOI 10.1144/gsjgs.150.2.0355.
• Philippe S, Haack U, Żelaźniewicz A, Dörr W and Franke W, 1995. Preliminary geochemical and geochronological results on shear zones in the Izera-Karkonosze Block (Sudetes, Poland). Terra Nostra 8:122.
• Pin C, Mierzejewski MP and Duthou JL, 1987. Wiek izochronowi Rb/Sr granitu karkonoskiego z kamieniołomu Szklarska Poręba Huta oraz oznaczenie stosunku inicjalnego 87Sr/86Sr w tymże granicie. (Rb-Sr isochron age of the Karkonosze granite from the quarry Szklarska Poręba Huta and determination of its 87Sr/86Sr initial ratio). Przegląd Geologiczny 35: 512-517 (in Polish).
• Przewłocki K, Magda W, Thomas HH and Faul H, 1962. Ages of some granitic rocks in Poland. Geochimica et Cosmochimica Acta 26: 1069-1075.
• Turniak K, Hałas S and Wójtowicz A, 2007. New K-Ar cooling ages of graitoids from the Strzegom-Sobótka Massif, SW Poland. Geochronometria 27: 5-9, DOI 10.2478/v10003-007-0019-9.
• Żelaźniewicz A, Nowak I, Achramowicz S and Czapliński W, 2003. The northern part of the Izera-Karkonosze block: a passive margin of the Saxothuringian terrane. In: Sudety Zachodnie od wendu do czwartorzędu, eds. W. Ciężkowski, J. Wojewoda and A. Żelaźniewicz, WIND, Wrocław: 17-32. (in Polish with English summary).