Hostname: page-component-cd9895bd7-dzt6s Total loading time: 0 Render date: 2024-12-27T11:58:44.716Z Has data issue: false hasContentIssue false
  • English
  • Français

Crystallization from stratified magmas in the Honningsvåg Intrusive Suite, northern norway: a reappraisal

Published online by Cambridge University Press:  05 July 2018

Christian Tegner ,
Brian Robins  and
Henning S. Sørensen
Christian Tegner
Affiliation:
Danish Lithosphere Centre, Øster Voldgade 10, 1350 København K, Denmark
Brian Robins
Affiliation:
Department of Geology, University of Bergen, 5007 Bergen, Norway
Henning S. Sørensen
Affiliation:
Department of Earth Sciences, University of Aarhus, 8000 Aarhus C, Denmark
Get access Rights & Permissions [Opens in a new window]

Abstract

Wedge-shaped layers of ultramafic and mafic cumulates in Intrusion II of the Caledonian Honningsvåg Intrusive Suite suggest crystallization on an inclined magma chamber floor from a compositionally-zoned and density-stratified magma.

Cyclic unit 8 (140–100 m thick) consists of a distally-thinning olivine gabbro (denoted paoC) macrolayer overlain by a distally-thickening gabbronorite, pahC. New mineral data in four traverses across cyclic unit 8 show systematic compositional changes; the Mg# of the mafic phases decreases upwards through the unit and distally, both along the base and along the paoC/pahC interface.

A crystallization model based on an effectively continuously-zoned magma chamber with numerous, relatively thin, double-diffusive magma layers is proposed. Differential migration of horizontal isopleths (e.g. Mg# and aSiO2) in response to fractional crystallization and assimilation of country rock can explain the variations in the Mg# of the cumulates.

Keywords

magma chambercumulatesdouble-diffusive convectioncyclic unitHonningsvågNorway
Type
The 1995 Hallimond Lecture
Information
Mineralogical Magazine , Volume 60 , Issue 398 , February 1996 , pp. 41 - 51
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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

Campbell, I.H. (1978) Some problems with the cumulus theory. Lithos, 11, 311–23.CrossRefGoogle Scholar
Campbell, I.H. and Turner, J.S. (1986) The influence of viscosity on fountains in magma chambers. J. Petrol., 27, 1—30.CrossRefGoogle Scholar
Campbell, I.H. and Turner, J.S. (1989) Fountains in Magma Chambers. J. Petrol, 30, 885–923.CrossRefGoogle Scholar
Campbell, I.H., Roeder, P.L. and Dixon, J.M. (1978) Plagioclase buoyancy in basaltic liquids as determined with a centrifuge furnace. Contrib. Mineral. Petrol, 67, 369–77.CrossRefGoogle Scholar
Curry, C.J. (1975) A regional study of the geology of the Mager0y basic igneous complex and its envelope. Unpublished Ph.D. thesis, Dundee University, Scotland.Google Scholar
Eales, H.V., de Klerk, W. J. and Teigler, B. (1990) Evidence for magma mixing processes within the Critical and Lower Zones of the northwestern Bushveld Complex, South Africa. Chem. GeoL, 88, 261-78.CrossRefGoogle Scholar
Eales, H.V., Maier, D.W. and Teigler, B. (1991) Corroded plagioclase feldspar inclusions in orthopyroxene and olivine of the Lower and Critical Zones, western Bushveld Complex. Mineral. Mag., 55, 479-86.CrossRefGoogle Scholar
Gee, D.G. and Sturt, B.A. (1985) The Caledonide Orogen - Scandinavia and related areas. J. Wiley & Sons Ltd., 1266p.Google Scholar
Irvine, T.N. (1981) A liquid-density controlled model for chromitite formation in the Muskox intrusion. Carnegie Inst. Washington Yearb., 80, 317–23. Irvine, T.N. (1982) Terminology for layered intrusions. J. Petrol, 23, 127–62.Google Scholar
Irvine, T.N., Keith, D.W. and Todd, S.G. (1983) The J- M Platinum-Palladium Reef of the Stillwater Complex, Montana: II. Origin by double-diffusive convective magma mixing and implications for the Bushveld Complex. Econ. GeoL, 78, 1287–334.CrossRefGoogle Scholar
Krill, A., Marek, J., Kunst, M. and Storch, P. (1993) Middle Llandovery (lower Aeronian) graptolites from hornfels on Mager0y. Norwegian Geological Society Geonytt, 93, (abstract).Google Scholar
Kruger, F.J. and Marsh, J.S. (1985) The mineralogy, petrology, and origin of the Merensky cyclic unit in the western Bushveld Complex. Econ. GeoL, 80, 958-74.CrossRefGoogle Scholar
McBirney, A.R. and Noyes, M.N. (1979) Crystallization and layering of the Skaergaard Intrusion. J. Petrol., 20, 487–554.CrossRefGoogle Scholar
Morse, S.A. (1984) Cation diffusion in plagioclase feldspar. Science, 225, 504–5.CrossRefGoogle Scholar
Nielsen, F.M. and Wilson, J.R. (1991) Crystallization processes in the Bjerkreim-Sokndal Layered Intrusion, South Norway: Evidence from the boundary between two Macrocyclic units. Contrib. Mineral. Petrol,, 107, 403–14.CrossRefGoogle Scholar
Prendergast, M.D. (1991) The Wedza-Mimosa platinum deposit, Great Dyke, Zimbabwe: layering and stratiform PGE mineralization in a narrow mafic magma chamber. Geol Mag., 128, 235–49.CrossRefGoogle Scholar
Roberts, D. and Andersen, T.B. Norkapp (1985). Description of the 1:250.000 geological map. Norwegian Geol. Surv. skrifter, 61, 1–49.Google Scholar
Robins, B. (1993) The evolution of the Honningsvag Intrusive Suite, Mager0y, Northern Norway. Norwegian Geol. Soc. Geonytt, 93, (abstract).Google Scholar
Robins, B., Haukvik, L. and Jansen, S. (1987) The organization and internal structure of cyclic units in the Honningsvag Intrusive suite, North Norway: Implications for intrusive mechanisms, doublediffusive convection and pore-magma infiltration. In: Origins of Igneous Layering,(I. Parsons, ed.), Reidel, 287-312.Google Scholar
Robins, B., Gading, M., Yurdakul, M. and Aitcheson, S.J. (1991) The origin of macrorhythmic units in the Lower Zone of the Lille Kufjord Intrusion, northern Norway. Norwegian Geol Surv., Bull., 420, 13–50.Google Scholar
Sørensen, H.S. and Wilson, J.R. (1995) A strontium and neodymium isotopic investigation of the Fongen-Hyllingen layered intrusion, Norway. J.Petrol, 36, 161–87.CrossRefGoogle Scholar
Sparks, R.S. J. and Huppert, H.E. (1984) Density changes during the fractional crystallization of basaltic magmas: fluid dynamic implications. Contrib. Mineral Petrol., 85, 300–9.CrossRefGoogle Scholar
Sparks, R.S. J. and Huppert, H.E. (1987) Laboratory experiments with aqueous solutions modelling magma chamber processes. I. Discussion of their validity and geological application. In; Origins of Igneous Layering,(I. Parsons, ed.), Reidel, 527—38.Google Scholar
Tegner, C. (1994) Magma chamber processes: Examples from four layered intrusions. Unpublished Ph.D. thesis, University of Aarhus, Denmark.Google Scholar
Tegner, C. and Wilson, J.R. (1995) Textures in a poikilitic olivine gabbro cumulate: Evidence for supercooling. Mineral. & Petrol, 54, 161–73.CrossRefGoogle Scholar
Tegner, C. and Robins, B. (1996) Picrite sills and crystal-melt reactions in the Honningsvag Intrusive Suite, Northern Norway. Mineral. Mag., 60, 53–66.CrossRefGoogle Scholar
Torsvik, T.H., Olesen, O., Trench, A., Andersen, T.B., Walderhaug, H.J. and Smethurst, M.A. (1992) Geophysical investigations in the Honningsvag Igneous Complex, Scandinavian Caledonides. J. Geol. Soc. London, 149, 373–81.CrossRefGoogle Scholar
Turner, J.S. and Campbell, I.H. (1986) Convection and mixing in magma chambers. Earth Sci. Rev., 23, 255-352.CrossRefGoogle Scholar
Wager, L.R. and Brown, G.M. (1968) Layered Igneous Rocks. Oliver & Boyd, 588 p.Google Scholar
Wilson, A.H. (1992) The geology of the Great Dyke, Zimbabwe: crystallization, layering, and cumulate formation in the PI Pyroxenite of cyclic unit 1 of the Darwendale Subchamber. J. Petrol, 33, 611–63.CrossRefGoogle Scholar
Wilson, J.R. and Larsen, S.B. (1985) Two-dimensional study of a layered intrusion-the Hyllingen Series, Norway. Geol. Mag., 122, 97–124.CrossRefGoogle Scholar
Young, I.M., Greenwood, R.C. and Donaldson, C.H. (1988) Formation of the eastern layered series of the Rhum Complex, northwest Scotland. Canad. Mineral., 26, 225–33.Google Scholar