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Palaeomagnetic, rock-magnetic and mineralogical investigations of the Lower Triassic Vardebukta Formation from the southern part of the West Spitsbergen Fold and Thrust Belt

Published online by Cambridge University Press:  31 January 2018

KATARZYNA DUDZISZ ,
KRZYSZTOF MICHALSKI ,
RAFAŁ SZANIAWSKI ,
KRZYSZTOF NEJBERT  and
GEOFFREY MANBY
KATARZYNA DUDZISZ*
Affiliation:
Institute of Geophysics, Polish Academy of Sciences, Księcia Janusza 64, 01-452, Warsaw, Poland
KRZYSZTOF MICHALSKI
Affiliation:
Institute of Geophysics, Polish Academy of Sciences, Księcia Janusza 64, 01-452, Warsaw, Poland
RAFAŁ SZANIAWSKI
Affiliation:
Institute of Geophysics, Polish Academy of Sciences, Księcia Janusza 64, 01-452, Warsaw, Poland
KRZYSZTOF NEJBERT
Affiliation:
Institute of Geochemistry, Mineralogy and Petrology, University of Warsaw, Al. Żwirki i Wigury 93, 02-089 Warsaw, Poland
GEOFFREY MANBY
Affiliation:
Natural History Museum of London, Great Britain, Cromwell Road, London SW7 5BD, UK
*
†Author for correspondence: [email protected]
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Abstract

Magnetic, petrological and mineralogical data from 13 sites (99 independently oriented samples) of the Lower Triassic rocks located in the SW segment of the West Spitsbergen Fold and Thrust Belt (WSFTB) are presented in order to identify the ferrimagnetic carriers and establish the origin of the natural remanent magnetization (NRM). Volcanic lithoclasts and other detrital resistive grains in which the primary magnetization might endure are present in some samples. On the other hand, petrological studies indicate that sulphide remineralization could have had an important influence on the remagnetization of these rocks. The dominant ferrimagnetic carriers are titanomagnetite and magnetite. While the titanomagnetite may preserve the primary magnetization, the magnetite is a more likely potential carrier of secondary overprints. The complex NRM patterns found in most of the samples may be explained by the coexistence and partial overlapping of components representing different stages of magnetization. Components of both polarities were identified in the investigated material. The reversal test performed on the most stable components that demagnetized above 300°C proved to be negative at the 95% confidence level at any stage of unfolding. They are better grouped, however, after 100% tectonic corrections and the most stable components are clustered in high inclinations (c. 70–80°). This suggests that at least part of the measured palaeomagnetic vectors represent a secondary prefolding magnetic overprint that originated in post-Jurassic time before the WSFTB event. Vitrinite reflectance studies show these rocks have not been subjected to any strong heating (<200°C).

Keywords

SvalbardWest Spitsbergen Fold and Thrust BeltTriassicpalaeomagnetism
Type
Original Article
Information
Geological Magazine , Volume 156 , Issue 4 , April 2019 , pp. 620 - 638
Copyright
Copyright © Cambridge University Press 2018 

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