Wstępna charakterystyka geochemiczna amfibolitów i skał ultramaficznych terranu West Ny-Friesland, północny Spitsbergen

• Autorzy: Bazarnik Jakub , Barker Abigail , Majka Jarosław , Kośmińska Karolina , Elvevold Synnøve , Bazarnik Mirosława

Identyfikatory

DOI

10.7306/2021.24

Warianty tytułu

EN

Preliminary geochemical characteristics of amphibolites and ultramafic rocks of the West Ny-Friesland Terrane, Northern Spitsbergen

• Języki publikacji: PL

Abstrakty

EN

The metamorphic Atomfjella Complex of the West Ny-Friesland Terrane, which belongs to the Eastern Basement Svalbard Province, is composed of four nappes, namely Dirksodden, Nordbreen, Rekvika and Finlandveggen. All these nappescomprise a granitic gneiss basement associated with a metasedimentary cover, both cut by numerous mafic dykes. At the top of the Atomfjella Complex, close to the boundary with the Mosselhalvaya Group (Nordaustlandet terrane), the lenses of ultramafic rocks also occur. Some authors suggested that they provide evidence for the presence ofa deeply rooted, large-scale tectonic boundary between the West Ny-Friesland and Nordaustlandet terranes. The performed geochemical characterization of amphibolites and ultramafic rocks showed that nearly all major elements (except Si and Fe) as well as LILE, have wide compositional ranges and no obvious trends (Bazarnik, Majka, 2021). It is conceivable that the Caledonian metamorphism may have affected K, Na and P, as well as LILE, and caused scatter of Al, Ti, Ca and Fe, and likely Si. The trace and REE elements plots are characterized mainly by trends that probably express the original magmatic processes. However, the elements that clearly deviate from these trends are disturbed due to either metamorphism or crustal assimilation. According to the Th/Yb vs Nb/Yb relationship, the studied rocks indicate generally low influence of crustal contamination, with only 3 samples in the field of MORB-OIB array (Fig. 4B). Besides the higher content of Mgandsome other minor differences in chemical composition, the ultramafic rocks exhibit trends similar to that of amphibolites. Based on this aforementioned similarity and the confirmed influence of the Caledonian metamorphism on both groups of rocks, we speculate about the common history of both groups of rocks. Moreover, thank sto the identification of metamorphic alterations in ultramafic rocks, it was proved that these rocks must be pre-Caledonian and, in turn, older than the alleged terrane boundary. Thus, the ultramafic bodies located close to the top of the Atomfjella Complex cannot mark the large terrane boundary and do not provide any evidence of a deeply rooted tectonic zone, but merely the result of ascension from deeper levels of the mantle.

Słowa kluczowe

PL

amfibolity; ultramafity; West Ny-Friesland; Svalbard

EN

amphibolites; ultramafites; West Ny-Friesland terrane; Svalbard

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Przegląd Geologiczny
• Rocznik: 2021
• Tom: Vol. 69, nr 7
• Strony: 406--410
• Opis fizyczny: Bibliogr.19 poz., fot., rys., tab., wykr.

Twórcy

autor

Bazarnik Jakub

• Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy, Oddział Karpacki, ul. Skrzatów 1, 31-560 Kraków

autor

Barker Abigail

• Department of Earth Sciences, Uppsala University, Villavägen 16, 752 36 Uppsala, Sweden

autor

Majka Jarosław

• Department of Earth Sciences, Uppsala University, Villavägen 16, 752 36 Uppsala, Sweden
• Wydział Geologii, Geofizyki i Ochrony Środowiska, Akademia Górniczo-Hutnicza, al. Mickiewicza 30, 30-059 Kraków

autor

Kośmińska Karolina

• Wydział Geologii, Geofizyki i Ochrony Środowiska, Akademia Górniczo-Hutnicza, al. Mickiewicza 30, 30-059 Kraków

autor

Elvevold Synnøve

• Norwegian Polar Institute, Framsenteret, Hjalmar Johansens gate 14, 9296, Tromso, Norway

autor

Bazarnik Mirosława

• Wydział Inżynieri Lądowej, Politechnika Krakowska, ul. Warszawska 24, 31-155 Kraków

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).