Isotopic composition of sulfur in stratified deposits of copper ores in Olekma-Vitim montane area

Bogdanov, Yu. V.; Golubchina, M. N.

doi:10.1080/00206817109475591

Cited by 5 publications

(6 citation statements)

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“…It does not depend on a geological setting of samples taken within different sections of the deposit (Medny, Sekuschy, Shumny-Krutoy, etc., Figure 3, Table S2). These variations are due to different mineral associations and their origin, i.e., typical chalcositebornite ores are characterized by δ 34 S = −2.7%-16.0‰, while chalcopyrite-pyrite ores have very light S-isotope composition, where δ 34 S changes from −15 to −28% (Table S2 [50][51][52][53]), and the cross-cutting chalcopyrite-pyrite veinlets are close to −13‰. Some samples located nearby to the gabbro dyke have positive δ 34 S (+4 and +13‰-+14‰) [50].…”

Section: Deposits In Carbonate-terrigenous Rocksmentioning

confidence: 99%

“…These variations are due to different mineral associations and their origin, i.e., typical chalcositebornite ores are characterized by δ 34 S = −2.7%-16.0‰, while chalcopyrite-pyrite ores have very light S-isotope composition, where δ 34 S changes from −15 to −28% (Table S2 [50][51][52][53]), and the cross-cutting chalcopyrite-pyrite veinlets are close to −13‰. Some samples located nearby to the gabbro dyke have positive δ 34 S (+4 and +13‰-+14‰) [50]. In general, the sulfur isotope composition of the sulfides in the Udokan deposit varies significantly.…”

Section: Deposits In Carbonate-terrigenous Rocksmentioning

confidence: 99%

“…It occurs in the exocontact of the Chineysky pluton and it is natural to suppose that its ores were largely formed under its influence. S2 and after [2,25,50,52].…”

Section: Mineral Composition Of Ores In the Kodar-udokan Regionmentioning

confidence: 99%

“…Maybe, this is the influence of the Luktursky gabbro massif. Therefore, this composition could be the result of S2 and after [2,25,50,52].…”

Section: Mineral Composition Of Ores In the Kodar-udokan Regionmentioning

confidence: 99%

“…The Udokan ores have mostly negative sulfur isotope data with some exclusions [50][51][52][53]. The chalcocite-bornite ores have the δ 34 S values = −20‰-−24‰ (Table S2, [10]), while the chalcopyrite-pyrite ores of the Udokan deposit are enriched in light sulfur isotopes of up to δ 34 S = −27.2‰ [50] (Figure 11), which is characteristic of the pyrites of the Naminginsky section (borehole 928, 405 m depth), while the disseminated chalcopyrite-pyrite ores of the Medny section have values of −12.9‰. One of the possible processes leading to this composition is a biogenic process of sulfate reduction, which leads to the most significant isotope fractionation.…”

Section: Sulfur Isotopes In the Ores Of The Deposits From The Kodar-u...mentioning

confidence: 99%

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Mineral and S-Isotope Compositions of Cu-Sulfide Deposits in Southern Siberia (Kodar–Udokan Region), Russia

Gongalsky,

Velivetskaya,

Taskaev

2024

Minerals

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The Kodaro–Udokan region is a huge Cu metallogenic province in Southern Siberia, one of the largest on Earth. It contains world-class copper sandstone-hosted Udokan (Cu reserves of 26.7 Mt) and PGE-Ni-Cu Chineysky deposits related to gabbro–anorthosite pluton (Cu—10 Mt; Fe-Ti-V, 30 Gt of ore). Furthermore, there are many small deposits of sulfide ores in sedimentary and igneous rocks in this region as well. For many decades, their genesis has been hotly debated. We studied the mineral composition and the sulfur isotopes in several deposits located at different levels of the stratigraphic sequence and in gabbro intruded in sandstones of the Udokan complex. The differences in ore compositions were found. The Burpala and Skvoznoy deposits consisting of the chalcocite–bornite association are characterized only by negative δ34S. The δ34S values for the Udokan deposits are mostly <0 (up to −28‰). The positive δ34S data characterize the ores of the Chineysky and Luktursky intrusions. Two Cu sandstone-hosted deposits are characterized by complex ore composition, i.e., the Krasny deposit, comprising chalcopyrite–pyrrhotite ores, is enriched in Co, Ni, Bi, Sb, Mo, Pb, Zn, Se, Te, and U and has a wide range of δ34S = −8.1–+13.5‰, and the Pravoingamakitsky deposit (Basaltovy section), consisting of quartz–chalcopyrite veins, has high PGE contents in ores with δ34S = +2.9–+4.0‰. These deposits are located near the gabbro massifs, and it is supposed that their ore compositions were influenced by magmatic fluids. The general regularities of the localization of the deposits in rift zones, and the proximity of mineral and isotopic composition allow us to conclude that the main source of copper could be rocks of basic composition because only they contain high Cu contents. Fluids from deep zones could penetrate to the surface and form Cu sandstone-hosted deposits.

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Section: Deposits In Carbonate-terrigenous Rocksmentioning

confidence: 99%

Section: Deposits In Carbonate-terrigenous Rocksmentioning

confidence: 99%

“…It occurs in the exocontact of the Chineysky pluton and it is natural to suppose that its ores were largely formed under its influence. S2 and after [2,25,50,52].…”

Section: Mineral Composition Of Ores In the Kodar-udokan Regionmentioning

confidence: 99%

“…Maybe, this is the influence of the Luktursky gabbro massif. Therefore, this composition could be the result of S2 and after [2,25,50,52].…”

Section: Mineral Composition Of Ores In the Kodar-udokan Regionmentioning

confidence: 99%