Fine gold particles and gold dust in alluvial autochthonous placers in southern West Siberia

Nesterenko, G. V.; Kolpakov, V.V.

doi:10.1016/j.rgg.2007.01.004

Cited by 6 publications

(1 citation statement)

References 4 publications

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“…The second is the alluvial transport of gold and the formation of a placer. Placer gold is characterized by a wide distribution of high-fineness rims with contrasting boundaries and a rare presence of high-fineness rims with diffusion boundaries, which may indicate a significant duration of gold residence in weathering crusts compared to its presence in alluvium [46]. The association of gold and uranium is well known, rather widespread and characteristic of several types of golduranium mineralization [47][48][49][50][51]: iron-oxide-copper-gold-uranium (IOCGU)-Ag deposits and most notably the Olympic Dam in South Australia, associated with hematite breccias, 2.57 to 1.0 billion years old; deposits of the "unconformity" type, Paleo-Meso-Proterozoic age (Alligator Rivers, etc.…”

Section: Discussionmentioning

confidence: 99%

Native Gold and Unique Gold–Brannerite Nuggets from the Placer of the Kamenny Stream, Ozerninsky Ore Cluster (Western Transbakalia, Russia) and Possible Sources

Zhmodik,

Airiyants,

Belyanin

et al. 2023

Minerals

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We carried out a comprehensive study of native gold (morphology, composition, intergrowths, and microinclusions) from alluvial deposits of the Kamenny stream (Ozerninsky ore cluster, Western Transbaikalia, Russia). The study showed that there were four types of native gold, which differed significantly in their characteristics and probably had different primary sources from which placers were formed: gold–quartz, oxidized gold–sulfide, gold–silver, and zones of listvenites with copper–gold and gold–brannerite (Elkon-type). Particular attention was paid to the study of unique, both in size and in composition, gold–brannerite nuggets of the Kamenny stream. It was established that the gold in the gold–brannerite nuggets (GBNs) had wide variations in chemical composition and mineral features. According to them, there were five different fineness types of native gold: 750–800‰; 850–880‰; 880–920‰; 930–960‰; and 980–1000‰. The data obtained indicated a multistage, possibly polygenic, and probably polychronous formation of GBN gold–uranium mineralization. The first stage was the formation of early quartz–nasturanium–gold–W–rutile–magnetite association (Middle–Late Paleozoic age). The second was the crystallization of brannerite and the replacement of an earlier pitchblende with brannerite (Late Triassic (T3)–Early Jurassic (J1) age). The third was the formation of the hematite–barite–rutile–gold association as a result of deformation–hydrothermal processes, which was associated with the appearance of zones of alteration in brannerite in contact with native gold with 8–15 wt.% Ag. The fourth was hypergene or the low-temperature hydrothermal alteration of minerals of early stages with the development of iron hydroxides (goethite) with impurities of manganese, tellurium, arsenic, phosphorus, and other elements. The carbon isotopic composition of an organic substance indicates the involvement of a biogenic carbon source. In the OOC area, there were signs that the composition of the GBNs and the quartz–chlorite–K–feldspar-containing rocks corresponded to Elkon-type deposits.

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Section: Discussionmentioning

confidence: 99%