Deposit number | Country | Location | Names | Commodities |
571 | Kazakhstan (Qostanay) | 53.03.00 N -- 063.12.00 E | Sokolovsk | Fe; P |
Database name: | World Fe-oxide+/-Cu-Au-U (IOCG) deposits | ||||||||||||||||||||||||
Compilers: | Sunil S. Gandhi | ||||||||||||||||||||||||
Release date: | 2015-03-04 | ||||||||||||||||||||||||
Deposit name(s): | Sokolovsk | ||||||||||||||||||||||||
Political location(s): | Kazakhstan; Province or state: Qostanay; Nearest community: Ekaterinburg, Russia (640 km 155°) | ||||||||||||||||||||||||
Deposit clan (type): | Kiruna-type | ||||||||||||||||||||||||
Deposit (sub) types: | described as 'contact metasomatic' deposit northwest of the Sokolovsk gabbro-diorite-granodiorite pluton; hosted by a limestone-tuff unit; skarn minerals in ore zones; scapolite zone in hanging wall ; Reference: Sokolov, G. A.; Grigor'ev, V. M., 1977: Deposits of Iron; in Ore Deposits of the USSR, Volume 1, Edited by Smirnov, V. I., Academy of Science, the Union Soviet Socialist Republics, Pitman Publishing Ltd., Pitman House, 39 Parker Street, London WC2B 5PB, U. K., 352 p, p. 7 - 113 massive magnetite ore | ||||||||||||||||||||||||
Deposit status: | producer; Size category: 1 billion tonnes | ||||||||||||||||||||||||
Geologic province: | Uralian Orogen | ||||||||||||||||||||||||
Geologic subprovince: | Valerianovsky Belt / Ural-Tobol Zone | ||||||||||||||||||||||||
Geologic district: | Turgai | ||||||||||||||||||||||||
Commodities: | Fe; P | ||||||||||||||||||||||||
Mineralization styles: | stratiform magnetite lenses; disseminations around massive bodies; banded; breccia-fillings; replacement; streaky | ||||||||||||||||||||||||
Geological ages: | Early Carboniferous (host rocks) Early Carboniferous (mineralization) | ||||||||||||||||||||||||
Tectonic setting: | continental marginal rift-graben; divergent; Formal name: Valerianov Belt / Ural-Tobol Zone (host rocks) | ||||||||||||||||||||||||
Coincident features: | intrusive contact (mineralization near contact of a folded carbonate-tuff unit and the Sokolovsk intrusion); Coincident feature name: Sokolovsk Intrusion bedding in host strata (replacement of interbedded tuffs and carbonates; layered ore passes laterally into unaltered host units); Coincident feature name: Valerianov Group folding (deposit on eastern limb of an anticline; pre-, syn- and post-ore structures localized intrusions and ore); Coincident feature name: Sarbai-Sokolovsk anticline pre-ore faults (deep-seated long-developing fault along the strike of the deposit, traversed by subvolcanic intrusive bodies); Coincident feature name: Sokolovsk Fault post-ore faults (NE faults subparallel to the trend of the host strata; post-ore faults caused block movements, shears and fractures); Coincident feature name: Set of NE and SE Faults dykes (a complex system of pre-ore and post-ore dykes, related to the Valerianov volcano-plutonic assemblage, affected the mineralized zones); Coincident feature name: pre-ore and post-ore dykes | ||||||||||||||||||||||||
Regional tectonic structure: | NNE-trending fault-bounded Early Carboniferous volcano-sedimentary assemblage (deposit on eastern limb of a NNE-trending anticline that hosts the Sarbai deposit on the western limb; subsidiary folds present ) Tectonic structure name: Valerianov Trend host strata deposited in one of the post-collisional rifts (the rifts characterized by basalt-dominated alkaline volcanism) Tectonic structure name: Valerianov Trend | ||||||||||||||||||||||||
Host rocks: | (1) sedimentary; carbonate (interbedded with tuffaceous sediments); Magma series/sedimentary package/metamorphic group: carbonate-tuff; Depositional setting: ensialic rift; Metamorphic grade: greenschist
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Related igneous rocks: | (1) intrusive; gabbro-diorite suite (related to volcanics in the host sequence); Initials: Sokolovsk Intrusion; Magma series: subalkaline; Depositional setting: continental
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Country rocks: | (1) intermediate volcanics; (interbedded sediments; related intrusions); Country rock name: Valerianov Group; Metamorphic grade: greenschist
(2) granite suite; (gabbro-diorite-granodiorite ); Country rock name: Valerianov volcano-plutonic assemblage; Metamorphic grade: greenschist-amphibolite
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Metallogenic signatures: | Fe-P-Cu | ||||||||||||||||||||||||
Alteration signatures: | albitization: albite; What was altered: feldspars skarn: andraditic garnet and diopsidic clinopyroxene; What was altered: calcareous rocks scapolitization: scapolite (10-28 % Meionite; Cl-bearing), pyroxene; What was altered: hanging wall strata chloritization: chlorite; What was altered: mafic silicates epidotization: epidote; What was altered: mafic minerals hematization: hematite; What was altered: magnetite oxidation: martite; What was altered: magnetite | ||||||||||||||||||||||||
Mineralogy: | (alteration): diopside, actinolite, andradite-grossularite, scapolite (marialite), albite, epidote, idocrase, chlorite, prehnite, marcasite, martite, zeolite (gangue): calcite (mineralization): magnetite, pyrite, hematite, apatite, pyrrhotite, chalcopyrite, sphalerite | ||||||||||||||||||||||||
Deposit shape: | zone of stacked tabular bodies and lenses
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Qualified comments: | (Applies to: discovery and development) Location 10 km E of Sarbai deposit; discovery in 1949; reserves in 1971: 967 Mt grading 41 % Fe; plus a large subeconomic tonnage; mined since 1957; open pit 3 km long; underground mining to the north. Zone of stacked stratiform lenses: 5.6 long, 0.5 km thick, dips 50° E for 1 km; change of dip to the west near south end; 5 main mineralized layers in limestone unit; ore contains 2.5-3.3 % S. (Applies to: regional geology) This depsit is similar to Sarbai, being hosted by bituminous limestone and calcareous tuffs and tuffites, which are contained in the intermediate volcanic unit, and which are replaced. | ||||||||||||||||||||||||
References: |
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