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 language | English |
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Pages (from-to) | 762-769 |
Number of pages | 8 |
Journal | Journal of Geology |
Volume | 94 |
Issue number | 5 |
Publication status | Published - 1986 |