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Minerals 2018, 8(7), 279; https://doi.org/10.3390/min8070279

Mineralogical, Rock-Magnetic and Palaeomagnetic Properties of Metadolerites from Central Western Svalbard

1
Institute of Geophysics Polish Academy of Sciences, ul. Księcia Janusza 64, 01-452 Warszawa, Poland
2
Natural History Museum, London, Cromwell Road, London SW7 5BD, UK
3
Department of Geology, University of Warsaw, ul. Żwirki i Wigury 93, 02-089 Warszawa, Poland
*
Author to whom correspondence should be addressed.
Received: 28 May 2018 / Revised: 21 June 2018 / Accepted: 26 June 2018 / Published: 29 June 2018
(This article belongs to the Special Issue Igneous Rocks: Minerals, Geochemistry and Ore Potential)
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Abstract

A 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 syn- to 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. View Full-Text
Keywords: magnetic mineralogy; rock-magnetic experiments; palaeomagnetism; Arctic; Western Spitsbergen magnetic mineralogy; rock-magnetic experiments; palaeomagnetism; Arctic; Western Spitsbergen
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Burzyński, M.; Michalski, K.; Manby, G.; Nejbert, K. Mineralogical, Rock-Magnetic and Palaeomagnetic Properties of Metadolerites from Central Western Svalbard. Minerals 2018, 8, 279.

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