Trace Element Geochemistry of Alluvial TiO2 Polymorphs as a Proxy for Sn and W Deposits
نویسندگان
چکیده
The Segura mining field, the easternmost segment of Góis–Panasqueira–Segura tin–tungsten metallogenic belt (north–central Portugal), includes Sn-W quartz veins and Li-Sn aplite-pegmatites, which are believed to be genetically related Variscan Granites. Sediment geochemistry indicates granite-related Ti-enrichments, locally disturbed by mineralization, suggesting magmatic metamorphic/metasomatic titaniferous phases. Therefore, alluvial samples their TiO2 polymorphs (rutile, anatase, brookite) were investigated, potential as exploration tools for Sn W deposits was evaluated. heavy-mineral assemblages proved good proxies bedrock geology, polymorph abundances found suitable indicators and/or metasomatic hydrothermal processes. trace element Segura’s rutile, brookite is highly variable, implying multiple sources a diversity mineral-forming main compositional differences between intrinsic (structural) factors, P-T-X extrinsic parameters forming environments. Anomalous enrichments, up 9% Nb, 6% W, 3% Fe, 2% Ta, 1% V in 1.8% 1.7% 1.2% 1.1% 0.5% registered. Brookite usually has low content (<0.5%), except Fe (~1%). HFSE-rich granitophile-rich rutile most likely magmatic, extremely differentiated melts, with contents enabling discrimination Sn-dominant W-dominant systems. Trace geochemical distribution maps show pronounced negative (rutile+anatase) (rutile) anomalies linked cassiterite precipitation, opposed alteration halos cassiterite-free mineralized areas, where primary shows enrichments similar rutile. This contribution recognizes that can robust, cost- time-effective, tool Sn(W) W(Sn) ore deposit
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ژورنال
عنوان ژورنال: Minerals
سال: 2022
ISSN: ['2075-163X']
DOI: https://doi.org/10.3390/min12101248