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The Rb-Sr age of the Sundsta granite in the Western Pregothian tectonic mega-unit, south-western Sweden

 

作者: Per-Olof Persson,   BentT. Hansen,  

 

期刊: Geologiska Föreningen i Stockholm Förhandlingar  （Taylor Available online 1982）
卷期: Volume 104, issue 1  

页码: 17-21

 

ISSN:0016-786X

 

年代: 1982

 

DOI:10.1080/11035898209454530

 

出版商: Taylor & Francis Group

 

关键词: Rb-Sr;dates;absolute age;whole-rock;granite;Western Pregothian mega-unit;Hästefjorden granite group;Sandsjön granite;migmatization;zoned zircons;initial Sr isotope ratio;N5932 N5936 E1202 E1152

 

数据来源: Taylor

 

摘要:

The Sundsta granite is a reddish acidic granite, situated in the Western Pregothian mega-unit in Värmland, south-western Sweden. Its Rb-Sr whole-rock age is 1566 ±39 Ma with an initial ratio of 0.705 ±0.003. The region is dominated by grey, migmatized granitoids presumably belonging to the Åmål-I group which has ages of 1650–1700 Ma. The marked difference in degree of migmatization between these two rock-units may indicate that the intrusion of the Sundsta granite post-dates the main migmatization phase of the Åmål-I granitoid in this region.

 

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