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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

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cris.lastimport.scopus2024-02-12T20:57:09Z
dc.abstract.enMagnetic, 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).
dc.affiliationUniwersytet Warszawski
dc.contributor.authorNejbert, Krzysztof
dc.contributor.authorJunosza-Szaniawski, Rafał
dc.contributor.authorManby, Geoffrey
dc.contributor.authorDudzisz, Katarzyna
dc.contributor.authorMichalski, Krzysztof
dc.date.accessioned2024-01-25T16:12:17Z
dc.date.available2024-01-25T16:12:17Z
dc.date.issued2019
dc.description.financeNie dotyczy
dc.description.number4
dc.description.volume156
dc.identifier.doi10.1017/S0016756817001145
dc.identifier.issn0016-7568
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/115412
dc.identifier.weblinkhttps://doi.org/10.1017/S0016756817001145
dc.languageeng
dc.pbn.affiliationearth and related environmental sciences
dc.relation.ispartofGeological Magazine
dc.relation.pages620-638
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titlePalaeomagnetic, rock-magnetic and mineralogical investigations of the Lower Triassic Vardebukta Formation from the southern part of the West Spitsbergen Fold and Thrust Belt
dc.typeJournalArticle
dspace.entity.typePublication