Details

Title

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

Journal title

Polish Polar Research

Yearbook

2012

Numer

No 1

Publication authors

Keywords

Arctic ; Svalbard ; zircon ; monazite ; uraninite ; geochronology

Divisions of PAS

Nauki o Ziemi

Coverage

1-17

Abstract

Neoproterozoic ( c. 640 Ma) amphibolite facies metamorphism and deformation have been shown recently to have affected the Isbj ø rnhamna 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 Isbj ø rnhamna 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.

Publisher

Polish Academy of Sciences ; Committee on Polar Research

Date

2012

Type

Artykuły / Articles

Identifier

ISSN 0138-0338 ; eISSN 2081-8262

DOI

10.2478/v10183−012−0003−6

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