International Geologiical Congress - Oslo 2008

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MRD-01 General contributions to mineral deposits

 

On the sources of copper in cupriferous sandstones and sources of manganese and on perspectives of it in the central Kazakhstan

 

Amangeldy Abeuov, Chief geologist, JSC ?K-Dorstroy? (Astana city) (Kazakhstan)
 

 

The supporters of the theory of sedimentary origin of copper in grey sandstones in Zhezkazgan region do not indicate the prospective regions of its drift. We suppose that numerous deposits of copper, situated in Spassky and Uspensky riftogenic-orogenic zones, with the length of 200-250 km, and situated 350-400 km to the east of previously mentioned hollows, served as copper sources in cupriferous sandstones in Zhezkazgan and Tenyz hollows. That is because of active denudation and the transfer of dissolved hypergene materials of copper by alluvial waters from these zones to the coastal waters (deltas of rivers, estuary, etc.) in Lower Dyas. At the same time, because of gradual rise of north wing, the bed of ancient river moved from north to south and formed following deposits: (from north to south): Kenen, Zhylandy group, Greater Zhezkazgan, Zhaman-Aybat. The deposits, covered by secondary quartzite, like Kounrad deposit, withstood that process. Due to these deposits, the strong zone of secondary sulfide concentration remained.
This conception multiply increases the perspectives of discovery of copper deposits under the High Dyas sediments in Zhezkazgan hollows between the Greater Zhezkazgan and Zhaman-Aybat deposits and further to the east and southeast and under the bodies of secondary quartzite in the Northern Pribalkhash'ye.

Ferromanganese and manganous ores, which formed in Proterozoic porphyroids because of destruction of rocky seashores in Dyas, serve as sources of manganese in the ore conglomerates and sandstones of Zhezdy, Zhaksykotr, Karatas deposits in the Ulytau-Zhezdy area. Lack of riftogenic zones in Devonian, which are usually accompanied by basaltic magmatism, genetically concerned with manganous deposits in Central Kazakhstan, places this area among the unpromising ones for discovery of new manganous deposits.

 

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