• MINERALOGICAL AND GEOCHEMICAL FEATURES OF SATPAEV Ti-Zr PLACER DEPOSIT, EAST KAZAKHSTAN

      Suiekpayev, Y; Sapargaliyev, Y; Bekenova, G; Kravchenko, M; Dolgopolova, Alla; Seltmann, Reimar (National Academy of Sciences of the Republic of Kazakshtan, 2019-02-15)
      The data of mineralogical and geochemical studies of Ti-Zr mineral sands and heavy fraction of the mineral concentrate of Placer No. 1 of the Satpaev deposit (East Kazakhstan) are obtained. The mineralogical composition of the mineral sands: quartz, albite, ilmenite, and feldspar; micro-sized crystals of barite, zircon, monazite, a mineral of pyrochlore composition, were identified by electron microprobe. Crystal morphology of ore minerals: ilmenite and zircon and chemical composition of ilmenite were determined. The development of leucoxenization in microcracks and edges of ilmenite crystals have also been revealed. Geochemical features of productive horizons include the apparent enrichment of light rare-earth elements (LREE) in comparison with heavy rare-earth elements (HREE), and pronounced negative Eu anomaly that indicate high degree of fractionation of source rocks. Granitoids of the Preobrazhensk intrusion are the likely source of the Satpaev placer deposit. Results of petrological and geochemical research indicate that localization of ore minerals took place during chemical weathering, which enabled release of ore minerals of titanium and zirconium with their further redeposition in local continental coastal settings in warm and humid climate.
    • PREDICTIVE ESTIMATE OF Ti-Zr PLACER DEPOSITS IN MESOZOIC AND CENOZOIC SEDIMENTS AT NW MARGINS OF THE ZAYSAN BASIN, EAST KAZAKHSTAN

      Suiekpayev, Y; Sapargaliyev, Y; Dolgopolova, Alla; Seltmann, Reimar; Raspopov, A; Bekenova, G (National Academy of Sciences of the Republic of Kazakshtan, 2019-04-15)
      During the research of orographic, geological and geomorphological characteristics of the Zaysan basin area aiming to identify targeting factors of Ti-Zr alluvial deposits it has been established that the following special favourable conditions are required for their formation: neighbouring occurrence of magmatic rocks with Ti-Zr credit; well-formed deep chemical weathering crust, which has facilitated the release of ore minerals; alluvial, proluvial limnic hydrodynamic conditions for transportation, segregation and concentration of Ti and Zr minerals; availability of local structural particular qualities (tectonic layers, basins), which have prevented the deposits from washing out during transgression and regression of the Zaysan paleo-lake. It has been established that well-known Ti-Zr deposits in the north-west margin areas of the Zaysan basin are geomorphologically located in gentle slope, non-segmented plains of subaerial denudation of 400–700m altitude, within the littoral zone of the Zaysan paleolake. The orographic representation of modern relief of the region have been established, stratigraphic positions of Mesozoic and Cenozoic placer deposits were determined, and an area for prospecting of new Ti-Zr deposits was identified.