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Chekmar |
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Kazakhstan |
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Cu Zn Pb Ag
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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The Chekmar volcanic hosted sulphide deposit is located 46 km to the north-east of Leninogorsk, in Kazakhstan. It is another of the deposits of the Rudny Altay district, and is associated with middle Devonian volcanics.
The host sequence is the 230 m thick Uspensk Suite which comprises, from the base,
i). spheroidal rhyolitic lava and lava-breccia; ii). a 'spotted' unit of abundant tuffs and acid lava; iii). a 'tuff-sediment' unit of irregularly alternating layers of tuffaceous sandstone, tuffaceous siltstone and other tuffaceous sediments.
The Uspensk Suite is overlain by the 250 m thick "Upper Suite" which is largely composed of felsic tuffs and rhyolitic flows with felsitic textures (Balychev, 1990).
Wallrock alteration comprises chlorite-sericite-quartz and silicification. The major structural feature in the deposit vicinity is an anticline with steep, 70 to 90° flanks. The main ore is present as stringer-impregnations, occurring as veins, rare disseminations and massive sulphide lenses.
The ore is composed of 10% Cu-Zn, 45% Pb-Zn and 45% polymetallic ore (Balychev, 1990). Chekmar is one of the "large" deposits of the Leninogorsk district.
The lower half of the orebody appears to be concentrated in the 'tuff-sediment' unit of the Uspensk Suite, where the alteration is predominantly chlorite-sericite-quartz, occasionally including the uppermost sections of the underlying 'spotted' unit. The upper section is hosted by silicified alteration in the basal sections of the Upper Suite felsic tuffs (Balychev, 1990).
The most recent source geological information used to prepare this decription was dated: 1996.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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