Manganese Mineralization in the Mesozoic Siliceous Deposits of the Central Sikhote-Alin and Nadanhada-Alin

Volokhin, Yu. G.; Карабцов, А. А.; Ustinov, A. Yu.

doi:10.1134/s181971401901007x

Cited by 4 publications

(1 citation statement)

References 6 publications

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“…In addition, in association with gold plates in a sample from the upper anthracite interlayer of the Detroit guyot Co-rich crust, we encountered a small plate of native copper (Figure 8). Moreover, cuprous gold is found in the hydrothermal crust of the Belyaevsky underwater volcano, and it is also found in the continental stratiform manganese deposits of the Sikhote-Alin mountain range [42], which were formed in marine environments [63]. The low-temperature formation of the researched ores in the cold marine environment is also characterized by the deficiency of reducing agents necessary for the destabilization of the prevailing halogen-and hydroxy-complex gold ions [64].…”

Section: Gold Concentrationmentioning

confidence: 99%

Gold in Ferromanganese Deposits from the NW Pacific

Михайлик

Иванов

2021

Minerals

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Ferromanganese crusts from four different areas of the North-West Pacific Ocean—the Detroit (northern part of the Imperial Ridge) guyot, the Zubov (Marshall Islands) guyot, the “Gummi Bear” seamount (an intraplate volcano near the Krusenstern FZ), and Belyaevsky volcano (the Sea of Japan)—were studied. Samples from the Detroit and Zubov guyots and the “Gummi Bear” seamount have similar chemical and mineral compositions of hydrogenetic cobalt-rich ferromanganese crusts. Crust from the Sea of Japan seems to reflect a hydrothermal influence. The gold content in most samples from the Detroit guyot was 68 ppb and from the Zubov guyot varied from 180 to 1390 ppb, which is higher than the average for the Pacific crusts (55 ppb). Gold content in two other samples was less than 10 ppb. Based on the electron microscopic studies, aggregation of gold particles with a size of 680 μm were identified in the Detroit guyot crust. The sizes of the Au particles are up to 10–15 μm, which has not been previously noted. Gold particles similar in morphology and size were also found in the Zubov guyot crust, which is located far from the Detroit guyot. The largest particle of gold (≈60 μm), represented by electrum, was found in the clay substrate from the “Gummi Bear” seamount. The lamellar, rudaceous morphology of the gold particles from the Detroit and Zubov guyots reflects their in situ formation, in contrast to the agglutinated, rounded with traces of dragging gold grain found in the substrate of the sample from the “Gummi Bear” seamount. Three-component (Ag-Au-Cu) gold particles were found in the hydrothermal crust from the Belyaevsky underwater volcano. Grains similar in composition were also found in Co-rich crust. The research results show that the gold was probably added to by hydrothermal fluid in the already-formed hydrogenetic ferromanganese crusts during rejuvenated volcanic stages. Biogeochemical processes may have played a major role in the formation of submicron solid-phase gold particles.

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Section: Gold Concentrationmentioning

confidence: 99%