Maximum age of the synmetamorphic Svecokarelian fold phases in south central Sweden
作者:
Eric Welin,
Göran Stålhös,
期刊:
Geologiska Föreningen i Stockholm Förhandlingar
(Taylor Available online 1986)
卷期:
Volume 108,
issue 1
页码: 31-34
ISSN:0016-786X
年代: 1986
DOI:10.1080/11035898609453743
出版商: Taylor & Francis Group
关键词: Radiometric age;U-Pb;Rb-Sr;St. Vika limestone quarry;eastern central Sweden
数据来源: Taylor
摘要:
At St. Vika in south central Sweden, a pegmatite has conformably intruded an early Proterozoic, Svecokarelian limestone. Isoclinal folds F1 along N-S axes and subsequent crossfolds F2caused the present structures. Zircons separated from the pegmatite have an age of 1854 ± 5 Ma (2sd), which is considered to reflect the time of intrusion of the pegmatite and consequently the maximum age of the deformation. The Rb-Sr whole rock age of the pegmatite is 1777 ± 24 Ma (2 sd). The closure of the Rb-Sr whole rock system reflects the cessation of the Svecokarelian late-kinematic actitvity and a time when the bedrock had cooled below the threshold for87Sr migration.
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