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Gravity studies of the Fen complex, Norway, and their petrological significance

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Abstract

The Fen alkaline complex, which is about 2 km in diameter, is an example of the carbonatite-ijolite-pyroxenite rock association. A Bouguer anomaly map reveals a sharp and almost circular gravity high centered above the complex, the residual peak value being about + 23 mgal. The gravity interpretation supports the ideas that the carbonatites represent only the volatile end fraction accumulated in the upper part of a long vertical magma chamber such as could form in an abyssal fissure, and that the major part of the pipe consists of an ultramafic parental or cogenetic rock originating from great depth (deep crust or upper mantle).

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Authors and Affiliations

  1. Institutt for Geologi, University of Oslo, Oslo 3, Norway

    Ivar B. Ramberg

  2. Department of Geology, University of Wyoming, 82070, Laramie, Wyoming, USA

    Ivar B. Ramberg

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  1. Ivar B. Ramberg
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Contribution No. 68 in the Norwegian Geotraverse Project.

On leave to Dept. of Geology, University of Wyoming, Laramie, Wyoming 82070.

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Ramberg, I.B. Gravity studies of the Fen complex, Norway, and their petrological significance. Contr. Mineral. and Petrol. 38, 115–134 (1973). https://doi.org/10.1007/BF00373876

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