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Mineralogical, rock-magnetic and palaeomagnetic properties of metadolerites from central Western Svalbard

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cris.lastimport.scopus2024-02-12T20:18:48Z
dc.abstract.enA combination of mineralogical, rock-magnetic and palaeomagnetic methods were employed in an attempt to shed a new light on the tectonism and paleogeography of Central Western Svalbard. The focus is on six metadolerite sites from the metamorphic Proterozoic–Lower Palaeozoic complex of south-western Oscar II Land (Western Spitsbergen). The primary mineral compositions of the metadolerites were strongly remineralized during Caledonian (sensu lato) greenschist-facies metamorphism although some younger tectonothermal modification is also apparent from the rock-magnetic studies. Rock-magnetic experiments supported by thin-section mineral identification and separation of Fe-containing fractions indicate that the main ferromagnetic carriers of the Natural Remanent Magnetization are represented by low-coercivity pyrrhotite and magnetite/maghemite. The investigated metadolerites are characterized by complex pattern of magnetization. The low-temperature palaeomagnetic components which demagnetized up to 250 °C, are characterized by high inclinations (~70–80°) potentially representing Mesozoic–Cenozoic remagnetization. The most stable middle-high temperature directions which demagnetized from 250 °C, were obtained from only two of six sites. Two Virtual Geomagnetic Poles calculated from two of the middle-high temperature site means do not correlate with the Laurussia reference path for synto post-Caledonian time. Two possible explanations of observed inconsistency are discussed. These are a modification of the Oscar II Land Caledonian basement geometry by listric faulting and/or tectonic rotations related to Daudmannsdalen–Protectorbreen high-strain (shear) zone. The results presented here suggest that post-Caledonian tectonic modification of the palaeomagnetic directions may be more a widespread feature of Western Svalbard. © 2018 by the authors. Licensee MDPI, Basel, Switzerland.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorBurzyński, Mariusz
dc.contributor.authorMichalski, Krzysztof
dc.contributor.authorManby, G.
dc.contributor.authorNejbert, Krzysztof
dc.date.accessioned2024-01-25T12:40:14Z
dc.date.available2024-01-25T12:40:14Z
dc.date.issued2018
dc.description.financeNie dotyczy
dc.description.number7
dc.description.volume8
dc.identifier.doi10.3390/MIN8070279
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/112625
dc.languageeng
dc.pbn.affiliationearth and related environmental sciences
dc.relation.ispartofMinerals
dc.relation.pages1-28
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.enArctic
dc.subject.enMagnetic mineralogy
dc.subject.enPalaeomagnetism
dc.subject.enRock-magnetic experiments
dc.subject.enWestern Spitsbergen
dc.titleMineralogical, rock-magnetic and palaeomagnetic properties of metadolerites from central Western Svalbard
dc.typeJournalArticle
dspace.entity.typePublication