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

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 pre...

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Bibliographic Details
Published in:Polar research 2010-12, Vol.29 (3), p.250-264
Main Authors: Majka, Jaroslaw, Czerny, Jerzy, Mazur, Stanislaw, Holm, Daniel K, Manecki, Maciej
Format: Article
Language:English
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Summary: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 Isbjoernhamna 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 degree C during M1 metamorphism. A cooling rate of ca. 5 degree C My-1 is estimated on the basis of geothermobarometry and the available U-Th-total Pb and Ar-Ar data.
ISSN:0800-0395
1751-8369
DOI:10.1111/j.1751-8369.2010.00186.x