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Siliciclastic sedimentation in a foreland basin to the Sveconorwegian Orogen and dolerites (0.98-0.95 Ga) related to intracratonic rifting

Magnus Ripa and Michael B. Stephens
Siliciclastic sedimentation in a foreland basin to the Sveconorwegian Orogen and dolerites (0.98-0.95 Ga) related to intracratonic rifting (in Sweden; lithotectonic framework, tectonic evolution and mineral resources, M. B. Stephens (editor) and J. Bergman Weihed (editor))
Memoirs of the Geological Society of London (2020) 50: 325-333

Abstract

Sub-ophitic, equigranular or plagioclase-phyric dolerite dykes, referred to as the Blekinge-Dalarna dolerite (BDD) swarm, were emplaced during the time span 0.98-0.95 Ga and trend NNE-NNW in an arcuate fashion, parallel to and east of the Sveconorwegian orogen. Dolerite sills are locally present. These rocks are subalkaline to alkaline with a monzogabbroic or gabbroic composition and show a predominantly within-plate tectonic affinity. epsilon (sub Nd) and epsilon (sub Hf) values fall in the range -2 to +4 and +1 to +5, respectively. Siliciclastic sedimentary rocks (Almesakra Group) in a small outlier in southern Sweden were deposited in an aeolian to fluviatile or lacustrine environment and an arid or semi-arid warm palaeoclimate, coevally with the dolerite sills. Smaller occurrences of sandstone with peperitic field relationships to the BDD dykes are known from other localities. The spatial distribution, orientation and age of the BDD magmatic suite suggest roughly east-west extension in the eastern, cratonic foreland to the Sveconorwegian orogen during the latest phase of this mountain-building event, the age data tentatively suggesting a younging to the east. The siliciclastic sedimentary rocks represent an erosional relict of a larger and spatially much more extensive early Tonian foreland basin to this orogen, as proposed earlier on the basis of fission-track thermochronology.


ISSN: 0435-4052
Coden: GSLMAD
Serial Title: Memoirs of the Geological Society of London
Serial Volume: 50
Title: Siliciclastic sedimentation in a foreland basin to the Sveconorwegian Orogen and dolerites (0.98-0.95 Ga) related to intracratonic rifting
Title: Sweden; lithotectonic framework, tectonic evolution and mineral resources
Author(s): Ripa, MagnusStephens, Michael B.
Author(s): Stephens, M. B.editor
Author(s): Bergman Weihed, J.editor
Affiliation: Swedish Geological Survey, Uppsala, Sweden
Affiliation: Lulea University of Technology, Lulea, Sweden
Pages: 325-333
Published: 2020
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 35
Accession Number: 2020-042956
Categories: Sedimentary petrologySolid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch maps
N57°22'60" - N58°00'00", E14°10'60" - E15°28'60"
Secondary Affiliation: Lulea University of Technology, SWE, Sweden
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 2020
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