A 1.9 ga glacial sedimentary-facies association at low palaeolatitude in the bergslagen group, grythyttan field, central sweden

G. Kuipers, F.F. Beunk, K. Yi, F.M. van der Wateren

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

© the authors.Glacial sedimentary facies are recognised in the Palaeoproterozoic (Orosirian) Bergslagen Group in central Sweden, described previously as post-orogenic conglomerates in the Grythyttan Field. The evidence is provided by the presence of macro boulders in a megaclastic to conglomerate rock formation or diamictite around lake Brunnsjön, south of Grythyttan. Pebble to cobble size conglomerates discordantly overlie a megaclastic rock formation, with facetted clasts resembling flatirons. The sedimentary facies assemblage resembles an ice-front resedimented sequence, previously interpreted as an alluvial fan by the writers. A glacial interpretation is supported by evidence of permafrost and related periglacial structures in coeval, 1895 ± 5 Ma (U–Pb zircon age), metavolcaniclastic rocks in the Bergslagen Group. The association of glacial sedimentary facies, permafrost and banded ironstones in the low-latitudinal Bergslagen Group suggests its similarity to better known ‘Snowball Earth’ deposits from Palaeoproterozoic and particularly Neoproterozoic times.
Original languageEnglish
Article number202101
JournalNorsk Geologisk Tidsskrift
Volume101
Issue number1
DOIs
Publication statusPublished - 2021

Fingerprint

Dive into the research topics of 'A 1.9 ga glacial sedimentary-facies association at low palaeolatitude in the bergslagen group, grythyttan field, central sweden'. Together they form a unique fingerprint.

Cite this