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Chapter 60. Evidence for late Neoproterozoic glaciation in the central Scandinavian Caledonides

Kumpulainen, R.A.; Greiling, R.O.

Abstract: The La°ngmarkberg Formation (Fm). rests on either the Neoproterozoic rift-related Risba¨ck Group or Palaeoproterozoic basement
in central Scandinavia. It is always succeeded in stratigraphy by the marine Ga¨rdsjo¨n Fm. The La°ngmarkberg Fm. is a thin, generally
less than 50-m-thick, discontinuous, but persistent unit, primarily in the Lower Allochthon; subordinately also in the Autochthon,
and Middle Allochthon of the central Scandinavian Caledonides. The formation is composed of a lower diamictite and an upper laminated,
lonestone-bearing mudstone.
Criteria supporting the glaciogenic origin of the formation are (i) a large regional extension of the formation (.5000 km2) and (ii) its
fixed position in the regional stratigraphy, (iii) the ‘tillite-like’ appearance of the lower part of the formation, (iv) the lonestone-bearing
mudstone in the upper part, (v) the presence of striated clasts and (vi) striated pavement. It is interpreted as having formed during one
single glacial–deglacial cycle.
Information on chemostratigraphy and realistic geochronology from t ... mehr

Zugehörige Institution(en) am KIT Geologisches Institut (Geolog. Inst.)
Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Buchaufsatz
Jahr 2011
Sprache Englisch
Identifikator ISBN: 978-1-86239-334-9
ISSN: 0435-4052
KITopen ID: 1000027237
Erschienen in The geological record of neoproterozoic glaciations. Ed.: E. Arnaud
Verlag The Geological Soc., London
Seiten 623-628
Serie Memoirs of the Geological Society of London ; 36
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