Geological and structural features, magmatism and mineralization of Sekysivske and Vasylkivske stockwork gold deposits (Kazakhstan)
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- Category: Geology
- Last Updated on 21 May 2017
- Published on 21 May 2017
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Authors:
A. I. Mizerny, D.Serikbayev East Kazakhstan State Technical University, Ust-Kamenogorsk, Kazakhstan, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
A. P. Miroshnikova, D.Serikbayev East Kazakhstan State Technical University, Ust-Kamenogorsk, Kazakhstan, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
M. Mizernaya, Cand. Sc. (Geol.-Min.), Assoc. Prof., D.Serikbayev East Kazakhstan State Technical University, Ust-Kamenogorsk, Kazakhstan, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
B. O. Diachkov, Dr. Sc. (Geol.-Min.), Prof., Acad. of NAS RK, D.Serikbayev East Kazakhstan State Technical University, Ust-Kamenogorsk, Kazakhstan, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Abstract:
Purpose. Identifying gold mineralization and associated elements distribution patterns in gold-bearing stockworks of large deposits of gold-sulphide-quartz type in Northern and Eastern Kazakhstan; detecting geological and structural position of x-ore stockworks.
Methodology. Field studies within the Vasilkovske ore field in Northern Kazakhstan and the Sekisovske ore field in Eastern Kazakhstan. Sampling ore-bearing magmatic rocks and ore bodies to determine the chemical composition and distribution patterns of the main ore minerals and impurities. Microprobe analysis using a scanning electron JSM 6390LV microscope with an energy-dispersive attachment, comparative characteristics of ore mineralization in the fields studied.
Findings. Completed research and comparative analysis of data from other regions of the world show that large stockwork gold-sulphide-quartz with tellurides and bismuth-bearing ore of the Vasylkivske and Sekysivske deposits formed in a period of high tectonic activity in the earth’s crust within regional geologic collision type structures, in the process of rhythmically pulsating displacement and tuck in the lithospheric plates and blocks. The position of ore stockworks is controlled by crust-magnesium deep splits, thrust structures and hypabyssal intrusions of gabbro-diorite-granodiorite-plagiogranite series. The mineralization is associated with intense tectonic crushing processes and hydrothermal-metasomatic transformation of host rocks, manifested in microclinization, albitization, propylitic alteration, beresitization and silicification as well as gaining ore minerals. The ore bodies are characterized by Au–Ag–Bi–Te specialization. The gold is of two types: free and banded with sulfides, the mineralization vertical distribution range being significant (over 500‒800 m). The banded gold deposits in the Vasylkivske deposit are localized in arsenopyrites, in the Sekysivske deposit gold mineralization is banded with pyrites of several generations.
Originality. Complex compounds of silver and gold with tellurium have been revealed in the Sekysivske and, with tellurium and bismuth in ores of the Vasylkivske deposit.
The complexity of ores involves setting a versatile task of basic and trace elements recording during all stages of work: from geological evaluation to production exploration. Modern processing technology and the latest development techniques allow classifying those fields as objects of industrial development priority. Studying them has scientific significance in the matters of endogenous ore formation, and creates a prerequisite to identifying promising new areas and deposits, both in Kazakhstan and in other parts of the world.
Practical value. The ore bodies of the studied deposits are localized in gold stockworks and breccias (with gold content from single digits to groups of ten gpt), there is a high resource potential and prospects of a significant growth of reserves. The ores are characterized by a variety of gold and silver tellurides, the high content of bismuth minerals and rare metal manifestation of specialization (Sn, Nb, Ta), which increases the profitability of the development of the deposits of this type. Tectonic, magmatic and mineralogical and geochemical factors controlling the formation of stockwork ore bodies and gold eruptive breccias, allow predicting the development of zones of mineralized breccia on the flanks and in the depth of the studied deposits. The considerable gold concentration areas, as well as the variety of related elements increase the development profitability of this type of deposits.
References
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