Palaeomagnetism of 935 Ma mafic dykes in southern Sweden and implications for the Sveconorwegian Loop

New palaeomagnetic results for the 935 Ma Goteborg-Slussen mafic dykes in southern Sweden provide a well-dated high-quality palaeomagnetic pole for Early Neoproterozoic Baltica. New U-Pb geochronological data for several palaeomagnetically studied mafic intrusions yield three additional well-dated p...

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Bibliographic Details
Published in:Geophysical Journal International
Main Authors: Pisarevsky, S A, Bylund, Göran
Format: Article in Journal/Newspaper
Language:English
Published: Oxford University Press 2006
Subjects:
Geology
Sweden
Sveconorwegian
palaeomagnetism
Baltica
mafic dykes
Norway
Slussen
Geomagnetic Pole
Online Access:https://lup.lub.lu.se/record/397449
https://doi.org/10.1111/j.1365-246X.2006.03076.x
Description
Summary:New palaeomagnetic results for the 935 Ma Goteborg-Slussen mafic dykes in southern Sweden provide a well-dated high-quality palaeomagnetic pole for Early Neoproterozoic Baltica. New U-Pb geochronological data for several palaeomagnetically studied mafic intrusions yield three additional well-dated palaeopoles and one virtual geomagnetic pole. This set of dated poles suggests minimal drift of Baltica in moderate latitudes between similar to 965 and 915 Ma. They also support the hypothesis of a post-900 Ma regional remagnetization event in SW Sweden and SW Norway. The positions of three distinct clusters of similar to 1100 to 850 Ma palaeopoles suggest a clockwise time progression of the Baltica apparent polar wander path (the Sveconorwegian Loop) during this time interval. New well-dated palaeomagnetic poles for similar to 970 to 900 Ma from Laurentia are required to verify the palaeogeographic reconstructions of Baltica and Laurentia.

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