Late Neoproterozoic through Silurian tectonic evolution of the Rödingsfjället Nappe Complex, orogen-scale correlations and implications for the Scandian suture
Posted on 2020-04-24 - 11:14
The Scandinavian Caledonides consist of disparate nappes of Baltican and exotic heritage, thrust southeastwards onto Baltica during Mid-Silurian Scandian continent-continent collision, with structurally higher nappes inferred to have originated at increasingly distal positions to Baltica. New U–Pb zircon geochronological and whole-rock geochemical and Sm–Nd isotopic data from the Rödingsfjället Nappe Complex reveal 623 Ma high-grade metamorphism followed by continental rifting and emplacement of the Umbukta gabbro at 578 Ma, followed by intermittent magmatic activity at 541, 510, 501, 484 and 465 Ma. Geochemical data from the 501 Ma Mofjell Group is indicative of arc magmatism at this time. Syn-tectonic pegmatites document pre-Scandian thrusting at 515 and 475 Ma, and Scandian thrusting at 429 Ma. These results document a tectonic history that is compatible with correlation with peri-Laurentian and/or -Gondwanan terranes. The data allow correlation with nappes at higher and lower tectonostratigraphic levels, including at least parts of the Helgeland, Kalak and Seve nappe complexes, implying that they too may be exotic to Baltica. Neoproterozoic fragmentation of the hypothesised Rodinia supercontinent probably resulted in numerous coeval, active margins, producing a variety of peri-continental terranes that can only be distinguished through further combined geological, palaeomagnetic and palaeontological investigations.
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Slagstad, Trond; Saalmann, Kerstin; Kirkland, Chris L.; Høyen, Anne B.; Storruste, Bergliot K.; Coint, Nolwenn; et al. (2020). Late Neoproterozoic through Silurian tectonic evolution of the Rödingsfjället Nappe Complex, orogen-scale correlations and implications for the Scandian suture. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.4951464.v1
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AUTHORS (14)
TS
Trond Slagstad
KS
Kerstin Saalmann
CK
Chris L. Kirkland
AH
Anne B. Høyen
BS
Bergliot K. Storruste
NC
Nolwenn Coint
CP
Christian Pin
MM
Mogens Marker
TB
Terje Bjerkgård
AK
Allan Krill
AS
Arne Solli
RB
Rognvald Boyd
TL
Tine Larsen
RL
Rune B. Larsen
CATEGORIES
KEYWORDS
R ödingsfj Nappe Complextectonic historyScandian suture465 MaGondwanan terranesSyn-tectonic pegmatites document pre-ScandianSeve nappe complexes578 Matectonostratigraphic levelsBaltica623 Ma501 Ma Mofjell Grouparc magmatismScandinavian Caledonides475 Maresults documenthypothesised Rodinia supercontinentthrust southeastwardsGeochemical dataUmbukta gabbromagmatic activitySilurian tectonic evolutionperi-continental terranesorogen-scale correlationsNeoproterozoic fragmentationpalaeontological investigations429 MaMid-Silurian Scandian continent-continent collisionwhole-rock geochemicalGeology