Hostname: page-component-848d4c4894-x5gtn Total loading time: 0 Render date: 2024-06-09T11:37:55.739Z Has data issue: false hasContentIssue false
  • English
  • Français

Clastic dykes from the Precambrian Porsangerfjord Group, North Norway

Published online by Cambridge University Press:  01 May 2009

D. M. Williams
D. M. Williams
Affiliation:
Geology DepartmentUniversity CollegeGalwayIreland
Get access Rights & Permissions [Opens in a new window]

Summary

Clastic dykes are described from a late Precambrian sequence of shallow water sediments — the Porsangerfjord Group of Finnmark, North Norway. The dykes are from one stratigraphic member of the Group and only occur where this member outcrops in a zone where sedimentation was thought to have been affected by recurrent earthquake shock. The dykes consist of poorly defined sandstone clasts in a muddy matrix. They exhibit no significant internal sedimentary structures. It is suggested that the dykes were intruded due to remobilization of sediment affected by a combination of tectonic shock and hydrostatic load. The dykes bear no genetic relationship to tectonic structures (cleavage and jointing) and evidence suggests that dewatering was virtually complete before the formation of the first cleavage.

Type
Articles
Information
Geological Magazine , Volume 113 , Issue 2 , March 1976 , pp. 169 - 176
Copyright
Copyright © Cambridge University Press 1976

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

Alterman, I. B. 1973. Rotation and dewatering during slaty cleavage formation: some new evidence and interpretations. Geology 1, 33–6.2.0.CO;2>CrossRefGoogle Scholar
Boulter, C. A. 1974. Tectonic deformation of soft sedimentary clastic dikes from the Precambrian rocks of Tasmania, Australia, with particular reference to their relations with cleavage. Bull. geol. Soc. Am. 85, 1413–20.2.0.CO;2>CrossRefGoogle Scholar
Conybeare, C. E. B. & Crook, K. A. W. 1968. Manual of Sedimentary Structures. Bureau of Mineral Resources, Geology and Geophysics, Australia. 327 pp.Google Scholar
Corbett, K. D. 1973. Open cast slump sheets and their relationship to sandstone beds in an upper Cambrian flysch sequence, Tasmania. J. sedim. Petrol. 43, 147–9.Google Scholar
Diller, J. S. 1890. Sandstone dikes. Bull. geol. Soc. Am. 1, 411–47.CrossRefGoogle Scholar
Dżulyński, S. & Walton, E. K. 1965. Sedimentary Features of Flysch and Greywackes. Developments in Sedimentology, no. 7. Elsevier, Amsterdam. 274 pp.Google Scholar
Føyn, S. 1967. Dividal-gruppen (Hyolithus-sonen) i Finnmark og dens forhold til de Eokambrisk-Kambriske formasjoner. Norg. geol. Unders. 249, 1–84.Google Scholar
Gayer, R. A. & Roberts, J. D. 1971. The structural relationships of the Caledonian nappes of Porsangerfjord, West Finnmark, North Norway. Norg. geol. Unders. 269, 21–67.Google Scholar
Maxwell, J. C. 1962. Origin of slaty and fracture cleavage in the Delaware Water Gap area, New Jersey and Pennsylvania. In Engel, A. E. J., James, H. L. & Leonard, B. F. (Eds): Petrologic Studies. Bull. geol. Soc. Am. 660 pp.Google Scholar
Middleton, G. V. & Hampton, M. A. 1973. Sediment gravity flows: mechanics of flow and deposition. Turbidites and Deepwater Sedimentation S.E.P.M., Pacific section, short course, pp. 1–38.Google Scholar
Moensch, R. H. 1966. Relation of S2 schistosity to metamorphosed clastic dykes, Rangeley-Phillips area, Maine. Bull. geol. Soc. Am. 77, 1449–62.CrossRefGoogle Scholar
Oomkens, E. 1966. Environmental significance of sand dikes. Sedimentology, 7, 145–8.CrossRefGoogle Scholar
Peterson, G. L. 1968. Flow structures in sandstone dikes. Sed. Geol. 2, 177–90.CrossRefGoogle Scholar
Pringle, I. R. 1972. Rb-Sr age determinations on shales associated with the Varanger ice age. Geol. Mag. 109, 465–72.CrossRefGoogle Scholar
Roberts, J. D. 1974. Stratigraphy and correlation of Gaissa Sandstone Formation and Børselv Subgroup (Porsangerfjord Group), South Porsanger, Finnmark. Norg. geol. Unders. 303, 57–118.Google Scholar
Rosendahl, H. 1945. Prekambrium-Eokambrium i Finnmark. Norsk geol. Tidsskr. 25, 327–49.Google Scholar
Swarbrick, E. E. 1968. Physical diagenesis: intrusive sediment and connate water. Sed. Geol. 2, 161–75.CrossRefGoogle Scholar
Vitanage, P. W. 1954. Sandstone dikes in the South Platte area, Colorado. J. Geol. 62, 493–500.CrossRefGoogle Scholar
White, B. 1969. The Stabbursnes Formation and Porsanger Dolomite Formation in the Kolvik district, northern Norway: the development of a Precambrian algal environment. Norg. geol. Unders. 258, 79–115.Google Scholar
Williams, D. M. 1975. A revised stratigraphy of the Gaissa Nappe, Finnmark. Norg. geol. Unders. (In the press.)Google Scholar