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An Introduction to Carbonatites and Carbonatite Complexes

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The Alnö Carbonatite Complex, Central Sweden

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Abstract

The Alnö igneous complex intruded local migmatites and granite country-rocks of Svecofennian age at ~580 Ma and produced a suite of early alkaline silicate intrusives (e.g., ijolites, nepheline syenites) and dykes (e.g., trachytes, phonolites) and later a suite of carbonatite sheet intrusions for which Alnö is widely known. The Alnö igneous complex displays an older and deformed northern ring complex and the main “southern” ring complex. An explosive carbonatite vent with melilitite lapilli is apparently a late event, as are kimberlitic alnöite dykes. The latter seem not to be diamantiferous.

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  1. Section for Mineralogy, Petrology and Tectonics, Department of Earth Sciences, Uppsala University, Uppsala, Sweden

    Peter Kresten

  2. Section for Mineralogy, Petrology and Tectonics, Department of Earth Sciences, Uppsala University, Uppsala, Sweden

    Valentin R. Troll

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Kresten, P., Troll, V.R. (2018). An Introduction to Carbonatites and Carbonatite Complexes. In: The Alnö Carbonatite Complex, Central Sweden. GeoGuide. Springer, Cham. https://doi.org/10.1007/978-3-319-90224-1_1

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