Upper Proterozoic stratigraphy and depositional environments of the Tossåsfjället Group, Särv Nappe, southern Swedish Caledonides
作者:
Risto Kumpulainen,
期刊:
Geologiska Föreningen i Stockholm Förhandlingar
(Taylor Available online 1980)
卷期:
Volume 102,
issue 4
页码: 531-550
ISSN:0016-786X
年代: 1980
DOI:10.1080/11035898009454506
出版商: Taylor & Francis Group
关键词: Lithostratigraphy;new stratigraphical units;environmental analysis;palaeocurrents;periglacial environment;glaciation;alluvium;carbonate sediments;dolomitic composition;chert;nodules;tillite;sandstone wedges;recumbent folds;Särv Nappe;Caledonides;Uppe
数据来源: Taylor
摘要:
A thick upper Proterozoic sedimentary sequence (4.5–6 km) has been identified in the Särv Nappe of the southern Swedish Caledonides. The sequence, defined as the Tossåsfjället Group, is divisible into five formations named in ascending order as the Lunndörrsfjällen Formation (alluvial), Kråkhammaren Formation (alluvial-littoral), Storån Formation (littoral), Lillfjället Formation (glacial-periglacial-aquatic), and Lövan Formation (alluvial). Palaeocurrents throughout the whole of the group suggest a general sediment transport from the Fennoscandian Shield towards the northwest. The group is cut at high angles by a tholeiitic dyke swarm. During the Caledonian Orogeny the Särv Nappe was displaced east-southeastwards over a distance exceeding 250 km. In its main outcrop area in Jämtland the nappe occurs as a major recumbent fold; its lower limb is highly attenuated, mylonitized and largely cut out by the basal thrust plane.
点击下载:
PDF (2893KB)
返 回