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Torellian (c. 640 Ma) metamorphic overprint of Tonian (c. 950 Ma) basement in the Caledonides of southwestern Svalbard

Published online by Cambridge University Press:  13 November 2013

JAROSŁAW MAJKA ,
YARON BE’ERI-SHLEVIN ,
DAVID G. GEE ,
JERZY CZERNY ,
DIRK FREI  and
ANNA LADENBERGER
JAROSŁAW MAJKA*
Affiliation:
Department of Earth Sciences, Uppsala University, Uppsala, Sweden
YARON BE’ERI-SHLEVIN
Affiliation:
Institute of Earth Sciences, The Hebrew University of Jerusalem, Israel Swedish Museum of Natural History, Stockholm, Sweden
DAVID G. GEE
Affiliation:
Department of Earth Sciences, Uppsala University, Uppsala, Sweden
JERZY CZERNY
Affiliation:
Department of Mineralogy, Petrography and Geochemistry, AGH – University of Science and Technology, Kraków, Poland
DIRK FREI
Affiliation:
Department of Earth Sciences, Stellenbosch University, South Africa
ANNA LADENBERGER
Affiliation:
Geological Survey of Sweden, Uppsala, Sweden
*
†Author for correspondence: jaroslaw.majka@geo.uu.se
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Abstract

Ion microprobe dating in Wedel Jarlsberg Land, southwestern Spitsbergen, provides new evidence of early Neoproterozoic (c. 950 Ma) meta-igneous rocks, the Berzeliuseggene Igneous Suite, and late Neoproterozoic (c. 640 Ma) amphibolite-facies metamorphism. The older ages are similar to those obtained previously in northwestern Spitsbergen and Nordaustlandet where they are related to the Tonian age Nordaustlandet Orogeny. The younger ages complement those obtained recently from elsewhere in Wedel Jarlsberg Land of Torellian deformation and metamorphism at 640 Ma. The Berzeliuseggene Igneous Suite occurs in gently N-dipping, top-to-the-S-directed thrust sheets on the eastern and western sides of Antoniabreen where it is tectonically intercalated with younger Neoproterozoic sedimentary formations, suggesting that it provided a lower Tonian basement on which upper Tonian to Cryogenian sediments (Deilegga Group) were deposited. They were deformed together during the Torellian Orogeny, prior to deposition of Ediacaran successions (Sofiebogen Group) and overlying Cambro-Ordovician shelf carbonates, and subsequent Caledonian and Cenozoic deformation. The regional importance of the late Neoproterozoic Torellian Orogeny in Svalbard's Southwestern Province and its correlation in time with the Timanian Orogeny in the northern Urals as well as tectonostratigraphic similarities between the Timanides and Pearya (northwestern Ellesmere Island) favour connection of these terranes prior to the opening of the Iapetus Ocean and Caledonian Orogeny.

Keywords

Spitsbergenzircon datingNeoproterozoicmagmatismmetamorphismCaledonian
Type
Original Articles
Information
Geological Magazine , Volume 151 , Issue 4 , July 2014 , pp. 732 - 748
Copyright
Copyright © Cambridge University Press 2013 

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