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Continental magmatic arc and siliciclastic sedimentation in the far-field part of a 1.7 Ga accretionary orogen

Magnus Ripa and Michael B. Stephens
Continental magmatic arc and siliciclastic sedimentation in the far-field part of a 1.7 Ga accretionary orogen (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: 253-268

Abstract

Trachyandesitic to trachybasaltic lavas, interlayered siliciclastic sedimentary rocks and subaerial ignimbrites with a rhyolitic to trachydacitic composition lie unconformably above metamorphic rocks in west-central Sweden. These volcanic rocks erupted at 1711 + 7/-6 to 1691 + or - 5 Ma and belong to a high-K, calc-alkaline to shoshonitic suite deposited in a continental arc setting. Positive epsilon (sub Nd) values and Nb/Yb ratios in the trachyandesitic to trachybasaltic rocks indicate an enriched mantle source. Coeval, 1710 + or - 11 to 1681 + or - 16 Ma plutonic and subvolcanic rocks are mainly granitic or quartz syenitic in composition. Subordinate components include quartz monzonite, quartz monzodiorite and monzogabbro or gabbro. epsilon (sub Nd) values in the range -1.0 to + 1.1 overlap with those in the inferred 1.9-1.8 Ga source rocks. All these rocks belong to the youngest phase of the lithodemic unit referred to as the Transscandinavian Igneous Belt. This magmatic province extends in a roughly NNW direction for at least 900 km, variably deformed and metamorphosed equivalents occurring inside and beneath younger orogenic belts to the south (Sveconorwegian) and north (Caledonian). The part of the province in west-central Sweden addressed here represents a far-field and shallow crustal component in this 1.7 Ga accretionary orogenic system.


ISSN: 0435-4052
Coden: GSLMAD
Serial Title: Memoirs of the Geological Society of London
Serial Volume: 50
Title: Continental magmatic arc and siliciclastic sedimentation in the far-field part of a 1.7 Ga accretionary orogen
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: 253-268
Published: 2020
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 53
Accession Number: 2020-042952
Categories: Igneous and metamorphic petrologySolid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch maps
N60°46'00" - N62°49'00", E13°16'00" - E16°22'00"
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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