. . "RIV/00216305:26110/11:PU97320" . "Distribution and evolution of zirconium mineralization in peralkaline granites and associated pegmatites of the Khan Bogd complex, southern Mongolia"@en . . . "CANADIAN MINERALOGIST" . . . . "gittinsite, Mongolia, zircon, Gobi desert, elpidite, granitic pegmatite, peralkaline granite, Khan Bogd, Zr mineralization, armstrongite"@en . . . "49" . . "[CC4BD882130C]" . . . . "RIV/00216305:26110/11:PU97320!RIV12-MSM-26110___" . "Krm\u00ED\u010Dek, Luk\u00E1\u0161" . "194941" . "CA - Kanada" . . "19"^^ . "4" . . . "5"^^ . . "The western part of the Khan Bogd complex, located in South Gobi (southern Mongolia), comprises (in order of emplacement): microcline-phyric granite, peralkaline aegirine-arfvedsonite granite (main intrusive phase) and aplite-pegmatite veins confined predominantly to the apical parts of the intrusion. These rocks are interpreted to represent products of extreme fractional crystallization involving alkali feldspar, quartz and, to a lesser extent, ferromagnesian silicates and, in the final stages of magma evolution, release of a silica-saturated orthomagmatic fluid. Geochemically, this evolutionary path involved an increase in index of peralkalinity (from 1.0 in the porphyritic granite to 1.3 in the main phase to 2.5 in the pegmatite) and whole-rock Zr content (864 to 1130 to 16900 ppm). In the porphyritic granite, zircon with a low Hf content (Zr/Hf = 55-75) is the principal Zr phase, whereas alkali-Ca zirconosilicate minerals are characteristically absent. Zirconium mineralogy in the peralkaline grani"@en . "I, Z(MSM0021622412), Z(MSM6215648902)" . "Distribution and evolution of zirconium mineralization in peralkaline granites and associated pegmatites of the Khan Bogd complex, southern Mongolia" . . . . . "0008-4476" . . "1"^^ . "The western part of the Khan Bogd complex, located in South Gobi (southern Mongolia), comprises (in order of emplacement): microcline-phyric granite, peralkaline aegirine-arfvedsonite granite (main intrusive phase) and aplite-pegmatite veins confined predominantly to the apical parts of the intrusion. These rocks are interpreted to represent products of extreme fractional crystallization involving alkali feldspar, quartz and, to a lesser extent, ferromagnesian silicates and, in the final stages of magma evolution, release of a silica-saturated orthomagmatic fluid. Geochemically, this evolutionary path involved an increase in index of peralkalinity (from 1.0 in the porphyritic granite to 1.3 in the main phase to 2.5 in the pegmatite) and whole-rock Zr content (864 to 1130 to 16900 ppm). In the porphyritic granite, zircon with a low Hf content (Zr/Hf = 55-75) is the principal Zr phase, whereas alkali-Ca zirconosilicate minerals are characteristically absent. Zirconium mineralogy in the peralkaline grani" . "Distribution and evolution of zirconium mineralization in peralkaline granites and associated pegmatites of the Khan Bogd complex, southern Mongolia"@en . . . "Distribution and evolution of zirconium mineralization in peralkaline granites and associated pegmatites of the Khan Bogd complex, southern Mongolia" . "26110" . .