3. The Weilasituo granite porphyry evolved over two stages: an early magmatic differentiation stage and a later magmatic–hydrothermal transition stage. The magmatic–hydrothermal transition stage can be further subdivided into the AMG and ABG substages based on petrological and mineralogical characteristi...
A final stage included the alteration of the aegirine, with removal of Na and addition of Al, partial replacement of the ilmenite by ferropseudobrookite, formation of the “fluorcalciopyrochlore” and unidentified Nb-rich phases (Fig.6), the local replacement of bastnäsite-(Ce) by the more...
Reduced samples were grounded below 75 µm and magnetically separated in a two-stage wet magnetic separation (WLIMS) process (Wet Test Chute from Master Magnets Ltd). The non-magnetic fraction formed was water leached at 60 °C for 1 h and subsequently leached in oxalic acid (0.5 M) at...
Two stages of mineralization are identified; the earliest stage (CGM-I) consists in scattered tabular or prismatic euhedral grains that were related to magmatic fractionation. The latest stage (CGM-II) is expressed as a Ta-rich Mn hydrothermal CGM episode represented as rims and/overgrowths ...