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Petrogenetic Processes Associated with Intermediate and Silicic Magmatism in the Oslo Rift, South-East Norway

Published online by Cambridge University Press:  05 July 2018

E. Rasmussen ,
E.-R. Neumann ,
T. Andersen ,
B. Sundvoll ,
V. Fjerdingstad  and
A. Stabel
E. Rasmussen
Affiliation:
Mineralogical-Geological Museum, Sars Gt. 1, 0562 Oslo 5, Norway
E.-R. Neumann
Affiliation:
Mineralogical-Geological Museum, Sars Gt. 1, 0562 Oslo 5, Norway
T. Andersen
Affiliation:
Mineralogical-Geological Museum, Sars Gt. 1, 0562 Oslo 5, Norway
B. Sundvoll
Affiliation:
Mineralogical-Geological Museum, Sars Gt. 1, 0562 Oslo 5, Norway
V. Fjerdingstad
Affiliation:
Mineralogical-Geological Museum, Sars Gt. 1, 0562 Oslo 5, Norway
A. Stabel
Affiliation:
Mineralogical-Geological Museum, Sars Gt. 1, 0562 Oslo 5, Norway
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Abstract

The Permian magmatic province of the Oslo rift, south-east Norway, includes large volumes of felsic and silicic rocks. Based on their geochemical character, these rocks may be divided into two main groups. The Larvik larvikites (monzonites) are highly enriched in large ion lithophile elements (LILE) (e.g. 10–32 ppm Th. 8–15 ppm Ta), and have an initial 87Sr/86Sr of 0.70391 ± 5. The syenites and granites have moderate to high concentrations of LILE (e.g. 7–88 ppm Th, 4–25 ppm Ta), and initial 87Sr/86Sr ratios between 0.705 and 0.707. The Larvik larvikites and extrusive equivalents (rhomb porphyry lavas) have similar initial Sr isotope ratios to uncontaminated basalts and gabbros in the rift, and are believed to have a mantle origin. The higher initial 87Sr/86Sr ratios in the silicic than in the felsic rocks reflect a crustal component representing the intermediate or low crust. After intrusion into the upper crust, the major and traceelement concentrations of the silicic magmas were modified through fractional crystallization dominated by removal of alkali feldspar, and transport of elements with a fluid phase. The silicic magmas appear not to have interacted significantly with the side rock at this stage.

Keywords

larvikitesyenitegranitemagmatismOslo riftNorway
Type
Petrology
Information
Mineralogical Magazine , Volume 52 , Issue 366 , June 1988 , pp. 293 - 307
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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Footnotes

*

Present address: Norsk Hydro A/S, 9400 Harstad, Norway.

†

Present address: IKU A/S, 7001 Trondheim, Norway.

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