Journal
CANADIAN MINERALOGIST
Volume 52, Issue 5, Pages 837-855Publisher
MINERALOGICAL ASSOC CANADA
DOI: 10.3749/canmin.1400012
Keywords
rare-earth elements; synchysite-(Ce); basalt; alteration; amygdule; Esterel; France
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Certain basaltic flows of the Permian volcanism in the Esterel (France) are enriched at their top and bottom in amygdules containing various minerals. Some of these amygdules appear to be particularly enriched in synchysite-(Ce), developed as fibrous aggregates together with chlorite and calcite. The rare earth element (REE) distribution pattern in individual amygdules appears very similar to that of the host basalt, suggesting that during the basalt's late hydrothermal evolution the REE were coherently remobilized and reprecipitated in the amygdules in the form of REE minerals. In such an environment, enriched in carbonate and F, the most stable REE mineral to crystallize from the hydrothermal solution was synchysite-(Ce), whose REE pattern has strong similarities to the host basalt.
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