Geology and mineralogy of the Novo-Akhmirovskoe deposit of lithiumtopaz-zinnwaldite granites (East Kazakhstan)

Литосфера

A. G. Vladimirov¹  B. A. D’yachkov¹  E. I. Mikheev¹  V. I. Maslov²  S. Z. Smirnov²  E. N. Jes²  I. F. Gertner³  T. A. Oitseva⁴  I. Yu. Annikova⁴  A. V. Travin⁴ 

[1] Novosibirsk State University;Tomsk State University.;East Kazakhstan Technical State University.;V.S..Sobolev Institute of Geology and Mineralogy, SB RAS;

关键词: lithium;    rare-metal granites;    u-pb;    rb-sr;    ar-ar isotope dating;    geochemistry;    mineralogy;    melt inclusion thermometry;    altai;    russia;    kazakhstan;   

DOI  :  10.24930/1681-9004-2019-19-2-304-326

来源: DOAJ

【 摘 要 】

Research subject. The Novo-Akhmirovskoe lithium-bearing deposit in the East Kazakhstan region, which is represented by an intrusive layer of topaz-zinnwaldite granites, is located within of the Kalba-Narym-Koktogai lithium-tantalum raremetal-granite belt. Being part of the Altai collision system, this belt is considered unique in terms of its length (more than 1000 km). Ores in the Novo-Akhmirovskoe deposit are represented by massive to low porphyry leucocratic granites composed of quartz (30–40%), albite (25–40%), microcline (15–35%), lithium mica varying in composition from zinnwal dite to lepidolite (up to 10%) and topaz (up to 5%). According preliminary estimates, the Novo-Akhmirov deposit is factually a poor lithium deposit with the Li2O content of 0.2–0.4 wt % and the estimated Li2O reserves of 110 thousand tones. Despite the favourable infrastructure and close proximity of this stock to Ust-Kamenogorsk mining and chemical-metallurgical enterprises, its ore-generating potential has not been sufficiently studied.Materials and Methods. In this research, we obtained new data on the geological structure, age, mineral composition and formation conditions of topaz-zinnwaldite granites in the Novo-Akhmirovskoe deposit. In addition, a comparative analysis of these ores with the topaz-biotite granites of the Black Sopka massif (0.6–0.7 wt % Li2O in protolitionite) and spodumene granite porphyries of the Alakha stock (Li2O = 0.9–1.1 wt %) was conducted. Results and Discussion. It is concluded that the development of this unique nonpegmatite lithium-bearing deposit requires deep exploratory drilling, mineralogical and technological research of core samples and reconsideration of economic efficiency parameters.

【 授权许可】

Unknown