1. Carbonatite melt in oceanic upper mantle beneath the Kerguelen Archipelago
- Author
-
Jean-Pierre Lorand, Christophe Renac, André Giret, Michel Grégoire, Guillaume Delpech, Simon M.F. Sheppard, Jean-Yves Cottin, Bertrand Moine, and Suzanne Y. O'Reilly
- Subjects
Calcite ,Dolomite ,Geochemistry ,Geology ,Silicate ,chemistry.chemical_compound ,chemistry ,Geochemistry and Petrology ,Silicate minerals ,Carbonatite ,Carbonate ,Metasomatism ,Mafic - Abstract
Some mantle-derived Kerguelen harzburgite and dunite xenoliths have bulk-rock and mineral trace element compositions that provide evidence of carbonatitic metasomatism similar to that described in some continental and other oceanic settings. Rare xenoliths contain carbonates that are highly enriched in rare earth elements (REE), interpreted to be quenched, evolved carbonatitic melts. One amphibole-bearing dunite mantle wall-rock containing carbonates in small interstitial pockets (100–500 μm across) has been studied in detail. Mg-bearing calcite (MgO
- Published
- 2004