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Martinfjella, a submeridional mountain chain which divides the glaciers Antoniabreen from Recherchebreen, NW Torell Land, Spitsbergen, was so-far believed to consist of Middle Proterozoic rocks attributed to the "Magnethogda sequence". In the present author's opinion, this sequence consists of rock-units comparable with the Lower Ordovician Sorkapp Land Group (Wiederfjellet and Luciapynten formations), the Cambrian Sofiekammen Group (Gnalberget Fm.), and the Upper Proterozoic Sofiebogen Group (Gashamna and Hoferpynten formations), as defined in the Hornsund area, south Spitsbergen. A stratabound iron-ore unit, here distinguished as the Jarnbekken Formation (new unit), divides the Wiederfjellet from the Luciapynten formations. A separate tectonic unit thrust over the above ones, consists of phyllites and quartzite's with pink migmatite (augen-gneiss, feldspathite) intercalations and bands. The present author considers this unit as a variety of the Gashamna Formation metasomatised by K-rich solutions, probably related to Caledonian magmatism. The Luciakammen Formation and the migmatite-bearing Gashamna Formation, continue eastwards across Antoniabreen to reappear in Aldegondaberget, Berzeliuseggene, Berzeliustinen and Hermelinberget. Within the "Recherchebreen sequence" of Chamberlindalen, three lithostratigraphic units of the Upper Proterozoic Sofiebogen Group have been distinguished: the Gashamna, the Hoferpynten and the Slyngfjellet formations.
Słowa kluczowe
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Tom
Strony
175--191
Opis fizyczny
Bibiogr. 28 poz.
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autor
- Institute of Geological Sciences, Polish Academy of Sciences, Kraków, Poland
Bibliografia
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BSL8-0003-0026
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