GEOLOGICAL-GEOPHYSICAL CRITERIA OF THE JEZKAZGAN ORE DIS-TRICT IN CENTRAL KAZAKHSTAN
Abetov A.E. Auyesbek A.A.
2024National Academy of Sciences of the Republic of Kazakhstan
News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2024#2024Issue 46 - 21 pp.
Stratigraphy, lithology, and structure of explored copper deposits and ore occurrences in the Zhezkazgan ore areas have been studied. The zonation of copper mineral distribution is confirmed in this region, where the endogenic nature of the ore is confirmed by specific elements, high temperatures of ore-forming solutions, and the absence of post-ore metamorphism. The uniqueness of the Zhezkazgan copper deposit is evident in the enormous vertical thickness of ore mineralization over a relatively small area and at shallow depths, with a tabular form associated with magmatic rocks of basic and ultrabasic compositions. The significant involvement of tectonic displacements, effusive, and intrusive magmatism in the formation of ore-bearing horizons, various structural elements, faults, and fracture systems, which served as conduits and localizers for ore mineralization, has been substantiated. There is observable correlation of isolines of positive residual gravity anomalies with the structural plan within the Zhezkazgan copper deposit and beyond. Zoning of the deposit has been performed based on the intensity of gravity anomalies ∆gₐ, depth of occurrence, and stratigraphic range of ore-hosting horizons. A forecast has been made regarding the possibility of identifying new ore deposits. The following characteristic combination of criteria defining copper mineralization in the Zhezkazgan ore field has been identified: a system of high-gradient and intensive maxima of geomagnetic field anomalies, concentration of rare earthquake epicenters at depths up to 20 km, and moderate amplitude of recent crustal movements. Linearly elongated relative maxima and minima of the region-al gravity field transform, excess density masses along the intracrustal transform, extremely high values of heat flow density, temperatures at depths of 10 km and 30 km, and protrusions on the Moho and granulite-basaltic layer surfaces correlated with basic and ultrabasic rocks within the consolidated crust. Morphology and orientation of geophysical field anomalies align with the orientation and manifestation of disjunctive tectonics, where deep heat mass transfer processes are allowed along the planes of deep faults.
cupriferous-sandstones , gravitational and magnetic fields , lithological-structural control , mineralization zoning , ore-bearing horizons
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Department of Geophysics and Seismology, Institute of Geology and Oil and Gas Business named after K. Turyssov, Satbayev University, Almaty, Kazakhstan
Kazakh National Technical Research University named after K.I. Satpayev, Institute named after K. Turyssov, Department of “Geophysics and Seismology”, Almaty, Kazakhstan
Department of Geophysics and Seismology
Kazakh National Technical Research University named after K.I. Satpayev
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