Seismic velocities of granulites from the Seiland Petrographic Province (N. Norway): Implications for Scandinavian lower continental crust

Main Article Content

P.N. Chroston
C.J. Evans

Abstract

Compressional and shear wave velocities have been measured in the laboratory at up to 1.0 GPa effective pressure on a suite of granulite facies rocks from the Seiland Petrographic Province. The suite may be of Precambrian age and the measurements were made to test a proposal that the suite represents lower continental crust. Compressional wave velocities at 0.4 GPa effective pressure range from 6.41–6.97 km s-1 with a mean of 6.71 km s-1 . Measurements of the parameter (∂V/∂Tp) suggest a value of a –0.8 x 10-3 km s-1 ºC-1 , and the temperature corrected mean velocity of about 6.5 km s-1 at 20 km depth is comparable to that found in parts of the lower crust in Scandinavia. The mean Poisson's ratio of 0.29 at 0.4 GPa is slightly higher than that found (0.276), but could be reduced if heterogeneity in the suite and the effect of higher pressures are taken into account. The occurrence of lower continental crust as a thrust slice in the Province is consistent with current ideas on the geological evolution of this area.


Google Scholar           ARK: https://n2t.net/ark:/88439/y080958


Permalink: https://geophysicsjournal.com/article/260


 

Article Details

How to Cite
Chroston, P.N., and C.J. Evans. 1983. “Seismic Velocities of Granulites from the Seiland Petrographic Province (N. Norway): Implications for Scandinavian Lower Continental Crust”. Journal of Geophysics 52 (1), 14-21. https://journal.geophysicsjournal.com/JofG/article/view/260.
Bookmark and Share

References

Assurnpcao, M., Bamford, D. (1978) LISPB-V: Studies of crustal shear waves. Geophys. J. R. Astron. Soc. 54:61-73

Bamford, D., Nunn, K., Prodehl, C., Jacob, B. (1978) LISPB-IV: Crustal structure of Northern Britain. Geophys. J. R. Astron. Soc. 54:43-60

Barth, T.F.W. (1953) The layered gabbro series at Seiland, Northern Norway. Norg. Geol. Unders. 184:191-200

Bath, M. (1971) Seismic wave velocities of the Swedish crust. Pure Appl. Geoph. 88:75-91

Birch, F. (1960) The velocity of compressional waves in rocks to 10 kilobars, Part I. J. Geophys. Res. 65:1083-1102

Birch, F. (1961) The velocity of compressional waves in rocks to 10 kilobars, Part II. J. Geophys. Res. 66:2199-2224

Brooks, M. (1970) A gravity survey of coastal areas of West Finnrnark, Northern Norway. Q. J. Geol. Soc. Lond. 125:171-192

Brooks, M. (1971) Positive Bouguer anomalies in some orogenic belts. Geol. Mag. 107:399-400

Brueckner, H.K. (1973) Reconnaissance Rb-Sr investigation of salic, rnafic and ultrarnafic rocks in the 0ksfjord area, Seiland Province, Northern Norway. Norsk. Geol. Tids. 53:11-23

Choudhury, M., Giese, P., de Visintini, G. (1971) Crustal structure of the Alps: some general features from explosion seismology. Boll. Geofis. 13:211-240

Christensen, N.I. (1979) Compressional wave velocities in rocks at high temperature and pressure, critical thermal gradients, and crustal low velocity zones. J. Geophys. Res. 84:6849-6857

Christensen, N.I., Fountain, D.M. (1975) Constitution of lower continental crust based on experimental studies of seismic velocities in granulite. Geol. Soc. Arn. Bull. 86:227-236

Chroston, P.N. (1974) Geological interpretation of gravity data between Trornso and Oksfjord (Finnrnark). Norg. Geol. Unders. 312:59-90

Chroston, P.N., Brooks, M., Sellevoll, M.A. (1976) A seismic refraction line across the Seiland Igneous Province, Northern Norway. Norsk Geol. Tids. 56:211-216

Evans, C.J. (1980) The seismic velocities of the Ox mountain granulites of Ireland and the implication for the interpretation of the crustal structure of north Britain. Geophys. J. R. Astron. Soc. 183:417-426

Evans, C.J., Lee, C.D., Chroston, P.N. (1978) Transient effects in laboratory measurements of compressional wave velocity and electrical conductivity. Nature 276:485-487

Fountain, D.M. (1976) The Ivrea-Verbano and Strona-Ceneri zones, northern Italy: a cross section of the continental crust- new evidence from seismic velocities of rock samples. Tectonophysics 33:145-165

Griffin, W.L., Taylor, P.N., Hakkinen, J.W., Heier, K.S., Iden, I.K., Krogh, E.J., Malm, O., Olsen, K.L., Orrnaasen, D.E., Tvetan, E. (1978) Archaean and Proterozoic crustal evolution in LofotenVesteralen, N. Norway. J. Geol. Soc. London 135:629-647

Hall, J., Al Haddad, F.M. (1976) Seismic velocities in the Lewisian metamorphic complex, northwest Britain - 'in situ' measurements. Scottish J. Geol. 12:305-314

Hall, J., Simmons, G. (1979) Seismic velocities of Lewisian metamorphic rocks at pressures to 8 kbar: relationship to crustal layering in north Britain. Geophys. J. R. Astron. Soc. 58:337-347

Harland, W.B., Gayer, R.A. (1972) The Arctic Caledonides and earlier oceans. Geol. Mag. 109:289-314

Holland, C.H., Sturt, B.A. (1970) On the occurrence of archaeocyathids in the Caledonian metamorphic rocks of S0rny and their stratigraphical significance. Norsk Geol. Tids. 41:109-155

Hooper, P.R. (1971) The rnafic and ultrarnafic intrusions of S.W. Finnrnark and N. Trorns. Norg. Geol. Unders. 269:147-158

Hughes, D.S., Maurette, C. (1957) Variation of elastic wave velocities in basic igneous rocks with pressure and temperature. Geophysics 22:23-31

Kern, H. (1978) The effect of high temperature and high confining pressure on compressional wave velocities in quartz-bearing and quartz-free igneous and metamorphic rocks. Tectonophysics 44:183-203

Kroenke, L.W., Manghani, M.H., Rei, C.S., Fryer, P., Rarnananantoandro, R. (1978) Elastic properties of selected ophiolitic rocks from Papua New Guinea. Nature and composition of Oceanic Lower Crust and Upper Mantle. In: Sutton, G.H. (Ed.) The Geophysics of the Pacific Ocean Basin and its Margin. Amer. Geophys. Union Geophysical Monograph 19, pp. 415-421

Krauskopf, K.F. (1954) Igneous and metamorphic rocks of the 0ksfjord area, West Finnrnark. Norg. Geol. Unders. 188:29-50

Lund, C.E. (1979) Crustal structure beneath the Blue Road profile, northern Scandinavia, derived from compressional wave velocity distribution. Geol. Foren. Stockh. Forh. 101:191-204

Norges Geologiske Undersokelse, Harnrnerfest (1974) Berggrunskart 1 :250,000, Publication NGU 301

Oosterorn, M.G. (1963) The ultrarnafic and layered gabbro sequence in the granulite facies rocks on Stjern0y, Finnrnark. Leidse Geol. Meded 28:1-96

Pringle, I.R. (1971) A review of radiometric age determinations from the Caledonides of West Finnrnark. Norg. Geol. Unders. 269:191-196

Pringle, I.R. (1975) A comment: reconnaissance Rb-Sr investigation of salic, rnafic and ultrarnafic rocks in the 0ksfjord area, Seiland Province, Northern Norway. Norsk Geol. Tids. 55:97-100

Ramsay, D.M. (1973) Possible existence of a stillborn marginal ocean in the Caledonian orogenic belt of north-west Norway. Nature Phys. Sci. 245:107-109

Robins, B., Gardner, P.M. (1974) The magmatic evolution of the Seiland Province, and Caledonian plate boundaries in northern Norway. Earth Planet. Sci. Lett. 26:167-178

Sellevoll, M.A. (1973) Mohorovičić discontinuity beneath Fennoscandia and adjacent parts of the Norwegian Sea and the North Sea. Tectonophysics 20:359-366

Sellevoll, M.A., Thanvarachorn, P. (1977) A seismic reconnaissance study of the Earth's crust in the Lofoten-Vesteralen area, N. Norway. In: Heier K.S. The Norwegian Guotraverse Project. Norg. Geol. Unders., Trondheim

Smith, P.J., Bott, M.H.P. (1975) Structure of the crust beneath the Caledonian foreland and Caledonian belt of the North Scottish region. Geophys. J. R. Astron. Soc. 40:187-205

Smithson, S.B. (1978) Modelling continental crust: structural and chemical constraints. Geophys. Res. Lett. 5:749-752

Smithson, S.B., Brewer, J.A., Kaufman, S., Oliver, J.E., Zaurilak, R.C. (1980) Complex archaean lower crustal structure revealed by COCORP crustal profiling in the Wind River Range, Wyoming. Earth Planet. Sci. Lett. 46:295-305

Smithson, S.B., Brown, S.K. (1977) A model for lower continental crust. Earth Planet. Sci. Lett. 35:134-144

Smithson, S.B., Ramberg, I.B., Grnnlie, G. (1974) Gravity interpretation of the Jotun nappe of the Norwegian Caledonides. Tectonophysics 22:205-222

Smithson, S.B., Shrive, P.N. (1975) Field measurements of compressional wave velocities in common crystalline rocks. Earth Planet. Sci. Lett. 27:170-176

Stewart, R., Peselnick, R. (1978) Systematic behaviour of compressional velocity in Franciscan rocks at high pressure and temperature. J. Geophys. Res. 83:831-839

Strand, T. (1972) The Norwegian Caledonides. In: Scandinavian Caledonides, De Sitter L.U. ed.: pp. 1-148. Wiley, New York

Sturt, B.A., Roberts, D. (1978) Caledonides of northernmost Norway (Finnrnark). In: Caledonian-Appalachian region of the North Atlantic Region. Geol. Sci. Canada, Paper 78-13:17-24

Sturt, B.A., Pringle, I.R., Ramsay, D.M. (1978) The Finnrnarkian phase of the Caledonian Orogeny. J. Geol. Soc. 135:597-610