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Both Nb–Ta-mineralized and Nb–Ta-poor syenitic dikes in the Panxi region (SW China) are spatially and temporally associated with syenitic plutons, which are part of the ~260Ma Emeishan large igneous province. These syenitic dikes are NW-striking, and have width varying from 1 to 5m and length from 50 to 300m. The dikes are mainly composed of K-feldspar, albite, aegirine and arfvedsonite, however,...
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