Neoproterozoic pegmatite from Skoddefjellet, Wedel Jarlsberg Land, Spitsbergen: Additional evidence for c. 640 Ma tectonothermal event in the Caledonides of Svalbard
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 Isbjørnham...
Published in: | Polish Polar Research |
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Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Walter de Gruyter GmbH
2012
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Subjects: | |
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 |
Summary: | 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. |
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