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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. 相似文献
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Farnoosh Farjandi Abdolghader Faiziev Mokhtar Fozilov Hassan Bastani Sara Soleimani 《Arabian Journal of Geosciences》2013,6(5):1435-1446
The aims of present study are investigation of endemic plants at Masjed–Daghi area introducing hyperaccumulator and indicator plants for Au, Ag, As, Cu, Mo, Hg, Re, Sb, and Te mineralization and also describe the biogeochemical response pattern over a known Au–Cu mineralized site. The Masjed–Daghi prospecting area is covered by Eocene flysch, andesite, trachyandesite, dacite, rhyodacite, Oligocene agglomerate, and Quaternary deposits. Previous researches reported copper porphyry mineralization and related epithermal gold veins in this area. This study presents that plants with high metal intake enabled us to obtain invaluable information about natural concentrations of chemical elements in the substrate and to recognize new potential areas for mineral prospecting. Stachys inflata has biological absorption coefficient mean exceeding or near hyperaccumulating criterion >1 for most of the elements investigated then could be as a hyperaccumulator. The indicator values belong to S. inflata, Artemisia sp., Salvia sp., Astragalus sp., Peganum harmala, Moltkia coerulea, and Cousinia sp. 相似文献
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