Neoproterozoic pegmatite from Skoddefjellet, Wedel Jarlsberg Land, Spitsbergen: Additional evidence for c. 640 Ma tectonothermal event in the Caledonides of Svalbard

• Published in: Polish Polar Research
• Main Authors: Majka, Jarosław, Larionov, Alexander, Gee, David, Czerny, Jerzy, Pršek, Jaroslav
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Walter de Gruyter GmbH 2012
• Subjects: Ecology; Ecology, Evolution, Behavior and Systematics; Eimfjellet; Isbjørnhamna; Svalbard; Wedel Jarlsberg Land; Wedel-Jarlsberg; Polar Research; Spitsbergen
• Online Access: http://dx.doi.org/10.2478/v10183-012-0003-6; http://content.sciendo.com/view/journals/popore/33/1/article-p1.xml; https://www.degruyter.com/view/j/popore.2012.33.issue-1/v10183-012-0003-6/v10183-012-0003-6.pdf

Neoproterozoic pegmatite from Skoddefjellet, Wedel Jarlsberg Land, Spitsbergen: Additional evidence for c . 640 Ma tectonothermal event in the Caledonides of Svalbard Neoproterozoic ( c . 640 Ma) amphibolite facies metamorphism and deformation have been shown recently to have affected the Isbjørnhamna and Eimfjellet Complex of Wedel Jarlsberg Land in southwestern Spitsbergen. New SHRIMP zircon U-Pb and in situ electron microprobe monazite and uraninite U-Th-total Pb ages are presented here on a pegmatite occurring within the Isbjørnhamna metasedimentary rocks. Although the dated zircons are full of inclusions, have high-U contents and are metamict and hence have experienced notable Pb-loss, the new Cryogenian ages are consistent with the age of regional metamorphism of the host metasediments, providing additional evidence for a clear distinction of the Southwestern Province from the other parts of the Svalbard Caledonides.