Micro-nanoansambli gold - indicators of the conditions of formation in organous deposit in Uzbekistan (South Tien Shan)

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Marco E. Ciriotti
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Micro-nanoansambli gold - indicators of the conditions of formation in organous deposit in Uzbekistan (South Tien Shan)

Messaggio da Marco E. Ciriotti » mer 07 ago, 2019 14:36

Prossima pubblicazione.

Referenza:
▪ Koneev, R.I., Khalmatov, R.A., Krivosheeva, A.N. (2019): Forms of occurrence, micro-nanoansambli gold - indicators of the conditions of formation, accomodation and type of ore organous deposit in Uzbekistan (South Tien Shan). Zapiski RMO, 148(4), (in press).

Abstract:
Gold ore orogenic deposits of Uzbekistan are confined to the South Tien Shan orogenic belt. They are located in black shales (Muruntau, Amantaytau, Daugyztau), terrigenous sedimentary (Kokpatas), volcanic (Balpantau) and intrusive (Zarmitan, Guzhumsai) rocks. Their age is 280-290 million years and coincides with the age of granitoid post-collisional magmatism. The deposits form Kyzylkum and Nurata mining areas. The studies were carried out using electron probe micro analysis (Superprobe 8800R) and mass spectrometry in inductively coupled plasma (ICP MS), using the methodology and basic concepts of nanomineralogy. Native gold was studied as a typical micro- nanomineral of its compound and micro-nanoensembles of compounds with Bi, Sb, As, Te, Se, S, Ag, Hg in primary quartz-sulfide and sulphide ores.
Seven mineral-geochemical types of ores form a successive, zonal, standard series (bottom-up): Au-W, with scheelite and molybdenite; Au-Bi-Te, with maldonite, tellurides, bismuth sulphotellurides; Au-As, with pyrite, arsenopyrite, minerals Ni-Co; Au-Ag-Te, with calaverite, petzite, hessite, etc.; Au-Ag-Se, with fichesserite, acanthite, freibergite, agvilarite, petrovskite, and others; Au-Sb-Ag, with aurostibite, boulangerite, burnonite, cincenite, chalcostibite, tetrahedrite, etc.; Au-Hg, cinnabar with consbergite, Hg-gold. The content of native gold on the histogram are grouped into five intervals from 300 to 1000‰. In deposits, regardless of the composition of the surrounding rocks, but in accordance with the depth of formation, zonation and the level of the erosion cut are combined from 2 to 5 types of ores. The industrial resource is determined by 2-3 types of ores, and constantly Au-As. In reality, there are 3 types of deposits: Au-W-Bi-Te, Muruntau, Myutenbay, Zarmitan; Au-As-Sb-Ag, Amantaytau, Kokpatas, Daugyztau; Au-Ag-Sb-Se, Kosmanachi, Okzhetpes.
The emphasis on the nanomineral approach at the study of gold, its compounds and micro-nano-ensembles increases the efficiency of searching, typing and evaluating the prospects of hidden mineralization, determining the conditions of formation and technological properties of gold ores.
Marco E. Ciriotti

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