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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
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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

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