Magnetic properties of the Alnön Complex
作者:
JohnD. A. Piper,
期刊:
Geologiska Föreningen i Stockholm Förhandlingar
(Taylor Available online 1981)
卷期:
Volume 103,
issue 1
页码: 9-15
ISSN:0016-786X
年代: 1981
DOI:10.1080/11035898109455197
出版商: Taylor & Francis Group
关键词: Palaeomagnetism;thermomagnetism;polar wandering;pole positions;dykes;plutonic rocks;sövite;alnöite;Alnön Complex;Fennoscandian Shield;Cambrian;Alnön;eastern Medelpad;east central Sweden;N6226 N6229 E1729 E1724
数据来源: Taylor
摘要:
The plutonic rocks, sövite ring dykes and alnöite dykes belonging to the (Cambrian) Alnön Complex have been analysed for palaeomagnetic study. Total NRM's residing in magnetite and pyrrhotite are locally very high in the plutonic facies and variable in the sövite dykes; all the alkaline phases have NRM's dominated by low coercivity components. Alternating field demagnetisation isolates a range of remanence directions, but a principal mean ofD= 107°,I= 2°(α95= 9°) in the bulk of the sövite and alnöite dykes is defined by both polarities and confirmed by thermal cleaning. A subsidiary direction ofD=350°,I= 15° (α95= 11°) is recognised predominantly in the plutonic rocks. The data contribute to the sparse Cambrian palaeomagnetic record from the Fennoscandian Shield and support earlier suggestions of large apparent polar wander motion in Cambrian times.
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