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ZONED RARE-METAL MINERALIZATION IN THE CENTRAL KALBA AREA (EAST KAZAKHSTAN)
Abstract
Currently the resources of rare metals, especially Ta, Nb, Be, and Li used in high-tech industries, are of great demand in Kazakhstan and worldwide. Main Ta, Nb, Be, Li, Sn, and W deposits in the Great Altai territory are hosted by Permian granitic belts that formed during the Late Paleozoic-Early Mesozoic orogeny, in a postcollisional setting. The largest metallogenic structure of the Kalba-Narym granitoid belt accommodates many genetically different deposits and occurrences. Pegmatitic rare-metal deposits have vertically and laterally zoned distribution patterns, with mineralization mostly localized in the tectonically active Central Kalba ore district. The richest spodumene and pollucite pegmatites are located in the upper parts of the ore zone. The mineralization types make up the following sequence: barren oligoclase-microcline pegmatites followed by microcline-quartz-muscovite (Nb, Be), microcline-albite (Ta, Sn, Be), albite (Ta, Nb, Be, Sn), albite-spodumene greisen (Li, Ta, Be, Sn), and cleavelandite-lepidolite-pollucite-spodumene (Ta, Li, Cs, Sn) zones. The zoned patterns of rare-metal mineralization have to be taken into account in further studies.
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References14
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