Hostname: page-component-cd9895bd7-hc48f Total loading time: 0 Render date: 2024-12-23T20:53:47.143Z Has data issue: false hasContentIssue false
  • English
  • Français

Rb-Sr age determinations on shales associated with the Varanger Ice Age

Published online by Cambridge University Press:  01 May 2009

I. R. Pringle
I. R. Pringle*
Affiliation:
Department of Geodesy and Geophysics, Madingley Rise, Cambridge
Get access Rights & Permissions [Opens in a new window]

Summary

Rb–Sr whole-rock isochron ages from shale horizons in the Late Pre-Cambrian tillite succession in Varangerfjord, Northern Norway, are presented. Although data from the Stappogiedde Formation, which overlies the tillite horizons, give a Caledonian, metamorphic age of 530±50 m.y., ages obtained from shales occurring between and below the tillites are believed to represent the approximate times of deposition of the sediments. An age of 810±90 m.y. for the Tanafjord Group enables this group to be correlated with the Upper Torridonian and the age of 668±23 m.y. for the Nyborg Formation, which is taken as the age of the Varanger Ice Age, allows a tentative correlation to be made with the Egan and Marinoan Glaciation in Australia.

Type
Research Article
Information
Geological Magazine , Volume 109 , Issue 6 , November 1972 , pp. 465 - 472
Copyright
Copyright © Cambridge University Press 1972

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Banks, N. L. 1970. Trace fossils from the Late Pre-Cambrian and Lower Cambrian of Finnmark, North Norway. Geol. J. special edition No. 4, 19.Google Scholar
Banks, N. L., Edwards, M., Geddes, W. P., Hobday, D. K., Laird, M. G. & Reading, H. G. 1971. A review of Late Pre-Cambrian and Cambro-Ordovician sedimentation in East Finnmark. Norg. geol. Unders. 169, 197.Google Scholar
Beynon, D. R. V., Chapman, G. R., Ducharme, R. O. & Roberts, J. D. 1967. The geology of the Leirpollen area. Tanafjord, Finnmark. Norg. geol. Unders. 247, 7.Google Scholar
Bjørlykke, K., Englund, J. O. & Kirkhusmo, L. A. 1967. Latest Pre-Cambrian and Eo-Cambrian stratigraphy of Norway. Norg. geol. Unders. 251, 5.Google Scholar
Bofinger, V. M. & Compston, W. 1967. A reassessment of the age of the Hamilton Group, New York and Pennsylvania and the role of inherited radiogenic Sr87 . Geochim. cosmochim. Acta 31, 2353.CrossRefGoogle Scholar
Bofinger, V. M., Compston, W. & Gulson, B. L. 1970. A Rb–Sr study of the Lower Silurian State Circle Shale, Canberra, Australia. Geochim. cosmochim. Acta 34, 433.CrossRefGoogle Scholar
Cahen, L. 1963. Glaciations anciennes et dérive des continents. Annls. Soc. géol. Belg. 86 Mém. 1, 19.Google Scholar
Compston, W. & Arriens, P. A. 1968. The Pre-Cambrian Geology of Australia. Can. J. Earth Sci. 5, 561.CrossRefGoogle Scholar
Dunn, P. R., Thomson, B. P. & Rankama, K. 1971. Late Pre-Cambrian Glaciation in Australia as a Stratigraphic Boundary. Nature, Lond. 231, 498.CrossRefGoogle Scholar
Føyn, S. 1937. The Eo-Cambrian series of the Tana district, Northern Norway. Norsk geol. Tidsskr. 17, 65.Google Scholar
Harland, W. B. 1965. Critical evidence for a great infra-Cambrian glaciation. Geol. Rdsch. 54, 45.CrossRefGoogle Scholar
Holtedahl, O. 1932. Additional observations on the Rock Formations of Finnmarken, Northern Norway. Norsk geol. Tidsskr. 11, 241.Google Scholar
Mawson, D. J. 1949. The late Pre-Cambrian ice age and glacial record of the Bibliando dome. J. Proc. R. Soc. N.S.W. 82, 150.Google Scholar
McIntyre, G. A., Brooks, C., Compston, W. & Turek, A. 1966. The statistical assessment of Rb–Sr isochrons. J. geophys. Res. 71, 5469.Google Scholar
Moorbath, S. 1969. Evidence for the age of deposition of the Torridonian sediments of north-west Scotland. Scott. J. Geol. 8, 154.CrossRefGoogle Scholar
Pankhurst, R. V. 1969. Strontium isotope studies related to petrogenesis in the Caledonian Basic Igneous Province of N.E. Scotland. J. Petrology 10, 115.CrossRefGoogle Scholar
Pringle, I. R. & Sturt, B. A. 1969. The age of the peak of the Caledonian Orogeny in West Finnmark, North Norway. Norsk geol. Tidsskr. 49, 435.Google Scholar
Reading, H. G. & Walker, R. G. 1966. Sedimentation of Eo-Cambrian Tillites and associated sediments in Finnmark, Northern Norway. Palaeogeography, Palaeoclimatol. Palaeoecol. 2, 177.CrossRefGoogle Scholar
Reusch, H. 1891. Skuringsmerker og morenegrus eftervist i Finnmarken fra en periode meget eldre enn ‘istiden’. Norges geol. Unders. Årbok 1891, 79.Google Scholar
Røe, S. L. 1970. Correlation between the Late Pre-Cambrian Older Sandstone Series of the Varangerfjord and Tanafjord areas. Norges geol. Unders. 266 Årbok 1970, 230.Google Scholar
Siedlecka, A. & Siedlecki, S. 1971. Late Pre-Cambrian sedimentary rocks of the Tanafjord–Varangerfjord region of Varanger Peninsula, Northern Norway. Norg. geol. Unders. 269, 246.Google Scholar