Carbonatites of the Dara-i-Pioz alkaline massif,central Tajikistan,and their compositional features |
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| Authors: | A R Faiziev F G Gafurov B N Sharipov |
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| Institution: | 1.Institute of Geology,Academy of Sciences of Tajikistan,Dushanbe,Tajikistan;2.Tajik National University,Dushanbe,Tajikistan;3.Main Geological Survey,Government of the Tajikistan Republic,Dushanbe,Tajikistan |
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| Abstract: | Carbonatites found in the Dara-i-Pioz alkaline massif, Tajikistan, form linearly-elongated, steeply-dipping and, sometimes,
rounded in plan pipe-like bodies of mainly calcitic composition. As compared to reference carbonatites, they have lower contents
of Fe, Mg, Ti, Sr, Ba, Mn, P, REE, Zr, Nb, Ta, and other elements but elevated contents of Rb, Cs, Al, Si, Na, K, and others.
However, the Dara-i-Pioz carbonatites are characterized by such typomorphic features of carbonatites as the sharp predominance
of LREE over HREE and high ΣCe: ΣY, La: Yb, and Sr: Ba ratios. |
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