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Pre-Silurian orogenic deformation in the north-central Scandinavian Caledonides

 

作者: Stefan Claesson,  

 

期刊: Geologiska Föreningen i Stockholm Förhandlingar  （Taylor Available online 1980）
卷期: Volume 101, issue 4  

页码: 353-356

 

ISSN:0016-786X

 

年代: 1980

 

DOI:10.1080/11035898009450858

 

出版商: Taylor & Francis Group

 

关键词: Rb-Sr;dates;absolute age;whole rock;isochrons;dykes;granitic composition;allochthons;orogeny;deformation;regional;metamorphism;Rödingsfjället Nappe;Caledonides;Ordovician;Överuman;southwestern;Lappland;northwestern Sweden;N6605 N6612 E1445

 

数据来源: Taylor

 

摘要:

A Rb-Sr whole rock isochron for late tectonic granitic dykes intruding the high-grade Rödingsfjället Nappe in the Scandinavian Caledonides gives an age of 447±7 Ma and an initial87Sr/86Sr ratio of 0.7060±0.0004 (87Rb decay constant λ = 1.42 × 10−11a−1). The dykes cut the regional schistosity in the country rocks and are themselves only locally deformed by later movements. It is suggested that the Ordovician age gives a lower limit for the timing of regional metamorphism in the area. The initial Sr-ratio implies that the magma was probably derived by anatexis of greywackes.

 

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