Dissolution-Repackaging of Hellandite-(Ce), Mottanaite-(Ce)/Ferri-Mottanaite-(Ce)

نویسندگان

چکیده

We investigated hellandite-group mineral phases from the Roman Region, alkali syenite ejecta, by multimethod analyses. They show a complex crystallisation history including co-precipitation of hellandite-(Ce) with brockite, resorption, sub-solidus substitution mottanaite-(Ce), exsolution perthite-like ferri-mottanaite-(Ce), overgrowth an oscillatory-zoned euhedral shell ferri-mottanaite-(Ce) and late, secondary precipitation pyrochlore in cribrose core. LREE/HREE crossover negative Eu anomaly minerals follows fO2 increase during magma cooling. The distinction among is based on element distribution M1, M2, M3, M4 T sites. Additional information miscibility relationship hellandite sensu strictu, tadzhikite, mottanaite, ferri-mottanaite ciprianiite endmembers derives molar fraction calculation. observed that change composition mimic ligands activity carbothermal-hydrothermal fluids related to carbonatitic magmatism.

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ژورنال

عنوان ژورنال: Minerals

سال: 2021

ISSN: ['2075-163X']

DOI: https://doi.org/10.3390/min11060610