LI-BEARING PEGMATITES OF THE KALBA-NARYM METALLOGENIC ZONE (EAST KAZAKHSTAN): MINERAL POTENTIAL AND EXPLORATION CRITERIA
Oitseva T.A. D′Yachkov B.A. Kuzmina O.N. Bissatova A.Y. Ageyeva O.V.
2022National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2022#2022Issue 183 - 90 pp.
The paper focuses on the formation patterns of Li-bearing pegmatites in the Kalba-Narym metallogenic zone in East Kazakhstan, with exploration implications. The main types of rare-metal (Ta, Nb, Be, Li, Cs, Sn, W, TR) mineralization are structurally and genetically related with Permian postcollisional granitoids of the Kalba-Narym belt. According to the suggested geological model simulating multistage evolution of mineral assemblages from oligoclase-microcline to albite varieties, mineralization at the Bakennoye, Yubileinoe, and other deposits is related with 285 Ma Kalba alkaline granites and occurs in Cs-bearing spodumene pegmatites located in the upper part of the ore zone. The distribution of pegmatite fields has been controlled by a large-scale system of old regional W-E faults which were rejuvenated during the collisional activity. Rare-metal pegmatite mineralization can be traced from the presence of cleavelandite, lepidolite, spodumene, pollucite, color tourmalines, ixiolite, and other indicator minerals. In addition to the classical pegmatitic deposits associated with granites, older (305 Ma) plagiogranites and dikes of the Kunush complex host Li-bearing albite-spodumene pegmatites with secondary Sn, Ta, and Li mineralization (Akhmetkino, Tochka, Aldai, and other deposits). The indicators for this mineralization type include albite, cleavelandite, spodumene, cymatolite, and tantalite-columbite. Albite-spodumene pegmatites in the region can provide additional Li resources and are worth of further investigation.
Granite , Kalba-Narym zone , Li resources , Mineral exploration , Pegmatite , Plagiogranite , Rare metals
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D. Serikbayev East Kazakhstan Technical University, Ust-Kamenogorsk, Kazakhstan
Geos LLP, Ust-Kamenogorsk, Kazakhstan
Altai Geological and Environmental Institute LLP, Ust-Kamenogorsk, Kazakhstan
D. Serikbayev East Kazakhstan Technical University
Geos LLP
Altai Geological and Environmental Institute LLP
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