Petrogenesis and tectonic-magmatic context of emplacement of lepidolite and petalite pegmatites from the Fregeneda-Almendra field (Variscan Central Iberian Zone): clues from Nb-Ta-Sn oxide U-Pb geochronology and mineral geochemistry

Special Issue Some applications of LA-ICP-MS U-Pb geochronology: A tribute to Jean Louis Paquette

Open Access

Fig. 9

Backscattered electron images and chemical maps (b) of Nb-Ta oxide minerals from FA Li-pegmatites. (a) Columbite-group minerals (CGM) in association with albite and amblygonite-group minerals (AGM) in the Ramalha petalite-rich pegmatite (P016). Note relics of K-feldspar in albite. (b-d) Variably zoned CGM crystals from (b-c) the Bajoca petalite-rich pegmatite and (d) P010 Li-mica-rich pegmatite. Note rims or mantles with light BSE signals reflecting high Ta/Nb ratios. (e) Fluorcalciomicrolite from the Ramalha-West (P017) Li-mica-rich pegmatite.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.