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Structure, petrochemistry and evolution of a sheet swarm in an Icelandic central volcano

Havard Gautneb, Agust Gudmundsson and Niels Oskarsson
Structure, petrochemistry and evolution of a sheet swarm in an Icelandic central volcano
Geological Magazine (November 1989) 126 (6): 659-673

Abstract

80% of the 504 inclined sheets and dykes in the 4-6 m.y. old Hafnarfjall central volcano in SW Iceland are <1.2 m thick. Of 140 chemically analysed sheets most are quartz tholeiites; a few are intermediate or acid. The sheets were generated by a shallow crustal magma chamber at a mature stage of the central volcano, whereas the host rock was generated earlier, before the chamber was established. Trace-element results suggest that the sheet magmas evolved by low-P fractional crystallization as well as by mixing of primitive magmas and crustal melts.


ISSN: 0016-7568
EISSN: 1469-5081
Coden: GEMGA4
Serial Title: Geological Magazine
Serial Volume: 126
Serial Issue: 6
Title: Structure, petrochemistry and evolution of a sheet swarm in an Icelandic central volcano
Affiliation: Univ. Iceland, Nordic Volcanol. Inst., Reykjavik, Iceland
Pages: 659-673
Published: 198911
Text Language: English
Publisher: Cambridge University Press, London, United Kingdom
References: 37
Accession Number: 1990-012411
Categories: Geochemistry of rocks, soils, and sedimentsIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, sketch map
N63°40'00" - N66°30'00", W24°45'00" - W13°30'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 1990
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