Palaeomagnetism of the dolerites of the Särv Nappe, southern Swedish Caledonides
作者:
Göran Bylund,
Olle Zellman,
期刊:
Geologiska Föreningen i Stockholm Förhandlingar
(Taylor Available online 1980)
卷期:
Volume 102,
issue 4
页码: 393-402
ISSN:0016-786X
年代: 1980
DOI:10.1080/11035898009454496
出版商: Taylor & Francis Group
关键词: Palaeomagnetism;pole positions;remagnetization;rotation;dykes;tholeiitic dolerite;Särv Nappe;Tossåsfjället Group;Caledonides;Caledonian Orogeny;Proterozoic;Silurian;Devonian;western Jämtland;west central Sweden;N6229 N6321 E1392 E1220
数据来源: Taylor
摘要:
The dolerites of the main part of the Särv Nappe contain, after progressive alternating field and thermal demagnetization, a stable magnetic component of decl. 21.4°, incl. −9.1°, α25= 12.4°,k= 11.3. This gives a geomagnetic pole at lat. 21°N, long. 170°E which is in agreement with published Silurian-Devonian poles from Fennoscandia. This together with a simple ‘fold test’ implies that the Proterozoic dolerites became remagnetized during the Caledonian orogeny. The magnetic directions from the dolerites in the northern part of the nappe, the Ottfjället block, indicate that this area has rotated ca. 100–110° counterclockwise in relation to the rest of the nappe.
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