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Neoproterozoic metamorphic evolution of the Isbjørnhamna Group rocks from south-western Svalbard

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A metamorphosed volcano-sedimentary complex constitutes the Caledonian basement in the south-western part of Wedel Jarlsberg Land, Svalbard. Field, textural and previous thermochronologic data indicate a weak, localized metamorphic Caledonian overprint (M2). Deformed M1 isograds and variation in pressure–temperature estimates indicate a pervasive Neoproterozoic amphibolite-facies metamorphism that pre-dates large-scale Caledonian age folding. Garnet–biotite and garnet–Al silicate–plagioclase (GASP) geothermobarometry of the Isbjørnhamna Group mica schists, and their comparison with the K2O–FeO–MgO–Al2O3–SiO2–H2O (KFMASH) petrogenetic grid, indicates a peak pressure of ca. 11 kbar, and a peak temperature of ca. 670°C during M1 metamorphism. A cooling rate of ca. 5°C My−1 is estimated on the basis of geothermobarometry and the available U–Th–total Pb and Ar–Ar data.
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Keywords: Caledonides; Neoproterozoic; Spitsbergen; geothermobarometry; metapelites

Document Type: Research Article

Affiliations: 1: Department of Mineralogy, Petrography and Geochemistry, AGH–University of Science and Technology, 30 Mickiewicza Av., PL-30059 Kraków, Poland 2: GETECH, Kitson House, Elmete Hall, Elmete Lane, Leeds, LS8 2LJ, UK 3: Department of Geology, Kent State University, Kent, OH 44242, USA

Publication date: 01 December 2010

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