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

Polar research

Jaroslaw Majka¹  Daniel K. Holm²  Maciej Manecki³  Jerzy Czerny³  Stanislaw Mazur⁴ 

[1] Department of Earth Sciences, Uppsala University, Villavägen 16, SE-75236 Uppsala, SwedenCorrespondence;Department of Geology, Kent State University, Kent, OH 44242, USA;Department of Mineralogy, Petrography and Geochemistry, AGH-University of Science and Technology, 30 Mickiewicza Av., PL-30059 Kraków, Poland;GETECH, Kitson House, Elmete Hall, Elmete Lane, Leeds, LS8 2LJ, UK

关键词: Caledonides;    geothermobarometry;    metapelites;    Neoproterozoic;    Spitsbergen;   

DOI  :  10.3402/polar.v29i3.6086

学科分类：自然科学（综合）

来源: Co-Action Publishing

【 摘 要 】

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.

【 授权许可】

CC BY-NC