Journal
POLAR RESEARCH
Volume 29, Issue 3, Pages 250-264Publisher
OPEN ACADEMIA AB
DOI: 10.1111/j.1751-8369.2010.00186.x
Keywords
Caledonides; geothermobarometry; metapelites; Neoproterozoic; Spitsbergen
Categories
Funding
- MNiSzW [2P04D03930]
- Swedish Institute
- Visby Programme
- Ymer-80 Foundation
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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 Isbjornhamna 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 degrees C during M1 metamorphism. A cooling rate of ca. 5 degrees 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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