Pyroclastic mechanisms for carbonatite intrusion

evidence from intrusives in the Fen central Complex, SE Norway.

T. Andersen, H. Qvale

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    Study of field relations and mesostructures of a heterogeneous intrusive body of ankeritic ferrocarbonatite and mafic silicate rocks (damtjernite) and their hydrothermally altered equivalent (roberg, ie hematite-calcite-dolomite carbonatite) in the Fen complex, SE Norway, reveals crosscutting contacts with wallrock gneiss, which demonstrates the intrusive nature of the ferrocarbonatite. Gradual transitions between the 2 units demonstrate their simultaneous emplacement. Ferrocarbonatite and damrjernite were emplaced as several pulses of fluidized material; and fluidization took place at a shallow level in the crust. The intrusion mechanism was pyroclastic, in principle analogous to that of kimberlite diatremes.-from Authors

    Original languageEnglish
    Pages (from-to)762-769
    Number of pages8
    JournalJournal of Geology
    Volume94
    Issue number5
    Publication statusPublished - 1986

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