The Östmark formation and neighbouring rocks in the Proterozoic of Värmland, western Sweden
作者:
PerH. Lundegårdh,
期刊:
Geologiska Föreningen i Stockholm Förhandlingar
(Taylor Available online 1980)
卷期:
Volume 102,
issue 2
页码: 137-140
ISSN:0016-786X
年代: 1980
DOI:10.1080/11035898009450891
出版商: Taylor & Francis Group
关键词: Areal geology;Östmark formation;Gräsmark Formation;Värmland granitoids;new lithostratigraphical unit;granite gneiss;gneiss;hyperite;metarhyolite;metadacite;meta-andesite;metagreywacke;mica schist;quartzite;kyanite;Proterozoic;central Vä
数据来源: Taylor
摘要:
This paper gives a survey of the Proterozoic rocks in central Värmland and neighbouring areas to the north. Special attention is given to the Östmark formation of volcanics and sedimentary rocks including the Hålsjöberg quartzite. The predominant rocks of the region are three generations of tectonized Svecokarelian granitoids called gneiss-granites. These seem to be younger than the sedimentary rocks of the Östmark formation. Still younger rocks in the region are a group of post-Svecokarelian Värmland granitoids, a black diabase known as hyperite, and the Gräsmark Formation of volcanics. All rocks mentioned have been tectonized twice during the final Precambrian orogenesis, viz. the Dalslandian (Sveconorwegian). Moreover, the older gneiss-granites have been tectonized during the Svecokarelian.
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