International Geologiical Congress - Oslo 2008

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MRD-10 Large ore provinces of Central Asia

 

Non-traditional precious-metallic mineralization of Median and Southern Tien-Shan

 

Erkinjon Igamberdiev, National University of Uzbekistan (Uzbekistan)
Rustam Yusupov, Museum Geology The ministry of Geology in Uzbekistan (Uzbekistan)
 

 

The ore deposits Median and Southern Tien-Shan (titanomagnetite, chromitic, sulphide-copper-nickel, copper-molybdenum, copper-pyrite, silver-polysulphide,gold-silver-ore etc.). carry an extra load composed of platinum-matallic mineralization. The components of "light" platinum (Pd, Rg, etc.) can be found in the crushed samples of black-shale rocks (Bukantau) and industrial products of Almalyk mining and smelting works.

Magmatic complexes of various levels of generatio - hypomoderate- and small depth [HD],[MD] and [SD], with exhibited productivity for precious-metallic (Au, Ag. MPG-metals of platinum group) mineralization and with accessory-mineral and geochemical specialization forMPG are accompanied, accordingly, bythe shows of "heavy", "heavily-light" and separately"light components of MPG, the practical significance of wich determine the degree of associated mineralization. The shows and MPG deposits of Median and Southern Tien-Shan have revealed relationships with rocks of mafic-ultramafic complexes (Atbashi, Kyrghyzata etc.). Precambrian and Paleozoic mafic-ultramafic complexes of Southern Tien-Shan are mineralized (Teinbulak, Beltau etc.)In places, the ore paragenesis includes precious-metallic and traces of unusual Pd-bearing(porpecite) or Pt-bearing Au-Ag ores, Native gold hosts most of the Pd and pt (up_to1.5% water i9n total), and native silver may contain up_to 1.5% water rh. Thus they arecritical phases in the complex assemblage of ores from wich MPG are being recovered.Mafic to ultramafic magmatic complexes of Pre-Cambrian and other ages, includung mesoabyssal volcano-plutonicformations having distinct accossory mineral and geochemical characteristic and productivity for metals of the Au-Ag-serias, including MPG, highlight thr high exploration potentional of the shows non traditional platinum-ore mineralization.

The research into non-traditional precious-metallic mineralization of Median and Southern Tian-Shan allowed us to outline the conditions of mobilization ofMPG, Aau and Ag from original melts which can be summed up as follows: "degassing" of mantle matter generatin hypodepth [HD] flow of hydrous gasseous fluid the passage of which through the melt was accompanied by the mobilizationof matalliferous aerosols with formations of nanostructural mineral isolations formation and development of "drained" structures of a base and carrying off gaseous liquid fluids of ore nanocomponents of melt beyond the centre being considered as a usuful factor of formation of latemagmatic and hydrothermal ore deposits; late_magmatic (regressive) shows of extraction and concentration of ore nanocomponents in the gaseous-fluid phase and formation of Au-Ag-ore mineralization with associate non-traditional Pt-bearing capacity.

 

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