Lyubavinskoe Gold Deposit (Eastern Transbaikalia): Sources of the Formation and Petrogeochemical Features of Rocks and Ores

Abramov, B. N.; Posohov, V. F.; Kalinin, Yu. A.

doi:10.1134/s1028334x19040196

Cited by 1 publication

(8 citation statements)

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“…The CAOB includes two principal structural oroclines, the Kazakhstan orocline and the Mongol-Okhotsk belt, both of which are characterized by adakite magmatism [246][247][248][249][250][251][252][253][254][255][256][257][258] (Figure 18). The Kazakhstan orocline is composed of Precambrian crustal fragments, Early (Cambrian to Early Silurian) and Late (Early Devonian to Carboniferous) Paleozoic magmatic arcs and accretionary wedges.…”

Section: Kazakhstanmentioning

confidence: 99%

“…The Trans-Baikal region records a protracted history of ocean basin openings and closures, terrane accretions and major collision episodes associated with intense regional deformation, metamorphism and plutonism [251]. For example, the final episodes of the subduction of the Paleo-Asian ocean floor produced the 339-285 Ma granitic Angara-Vitim [253]; Delmachik [254]; Baley (Taseevsky) [252]; Oui-Tolgoi [256]; Erdenet [246,255]; Shirokinsky [251]; Luginsky [252]; Noion-Tolgoi [252]; Kounrad [249]; Aktogai [246,248]; Duobaoshan [258]; Tuwu-Yandong [246,257]; Bystrinsky [250]; Aksug [247].…”

Section: Trans-baikal Regionmentioning

confidence: 99%

“…The Late Jurassic-Early Cretaceous post-collision extension that followed the final closure of the Mongol-Okhotsk Ocean is marked with prolific calc-alkaline to shoshonitic and alkali basaltic volcanism as well as ultramafic/mafic to felsic plutonism associated with numerous Cu-Au-Ag-Mo-polymetallic porphyry/skarn/epithermal deposits and mineral showings [247,250,251]. Adakites are quite common through out the Trans-Baikal region, where they host several large Cu-Au-Mo porphyry, skarn and epithermal deposits (Figures 18 and 19; Table 10; [247,[250][251][252][253]. One of the largest mineralized systems closely associated with adakite magmatism in the Trans-Baikal region, is the giant Bystrinsky Cu-Fe-Mo-Au deposit located in the eastern part of this metal-rich region (Figure 18; Table 10; [251]).…”

Section: Trans-baikal Regionmentioning

confidence: 99%

“…Some adakite-hosted deposits in the Trans-Baikal region represent high-level Au-Ag or vertically zoned, telescoped porphyry/high-sulfidation Au-dominated polymetallic environments [252][253][254]. One of the best-known examples of this type is the Shirokinsky cluster (Figure 18), which includes the Novo-Shirokinsky gold-polymetallic deposit, currently a 0.8 million tonnes per annum (mtpa) operation by Highland Gold (Table 10).…”

Section: Trans-baikal Regionmentioning

confidence: 99%

“…Several epithermal gold deposits in the Trans-Baikal region are also associated with adakite magmas. The Lyubavinsky low-sulfidation gold deposit (Figure 18; Table 10) is hosted in Jurassic gradnodiorite and quartz porphyry dikes and stocks intruded into Devonian-Triassic clastic metasediments [253]. The mineralization is represented by high-grade (0.5-600 g/t Au, average of 45.1 g/t Au) quartz, quartz-micirocline and quartz-adularia veins containing minor pyrite, arsenopyrite, chalcopyrite and molybdenite [253].…”

Section: Trans-baikal Regionmentioning

confidence: 99%

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Adakites, High-Nb Basalts and Copper–Gold Deposits in Magmatic Arcs and Collisional Orogens: An Overview

et al. 2022

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Adakites are Y- and Yb-depleted, SiO2- and Sr-enriched rocks with elevated Sr/Y and La/Yb ratios originally thought to represent partial melts of subducted metabasalt, based on their association with the subduction of young (<25 Ma) and hot oceanic crust. Later, adakites were found in arc segments associated with oblique, slow and flat subduction, arc–transform intersections, collision zones and post-collisional extensional environments. New models of adakite petrogenesis include the melting of thickened and delaminated mafic lower crust, basalt underplating of the continental crust and high-pressure fractionation (amphibole ± garnet) of mantle-derived, hydrous mafic melts. In some cases, adakites are associated with Nb-enriched (10 ppm < Nb < 20 ppm) and high-Nb (Nb > 20 ppm) arc basalts in ancient and modern subduction zones (HNBs). Two types of HNBs are recognized on the basis of their geochemistry. Type I HNBs (Kamchatka, Honduras) share N-MORB-like isotopic and OIB-like trace element characteristics and most probably originate from adakite-contaminated mantle sources. Type II HNBs (Sulu arc, Jamaica) display high-field strength element enrichments in respect to island-arc basalts coupled with enriched, OIB-like isotopic signatures, suggesting derivation from asthenospheric mantle sources in arcs. Adakites and, to a lesser extent, HNBs are associated with Cu–Au porphyry and epithermal deposits in Cenozoic magmatic arcs (Kamchatka, Phlippines, Indonesia, Andean margin) and Paleozoic-Mesozoic (Central Asian and Tethyan) collisional orogens. This association is believed to be not just temporal and structural but also genetic due to the hydrous (common presence of amphibole and biotite), highly oxidized (>ΔFMQ > +2) and S-rich (anhydrite in modern Pinatubo and El Chichon adakite eruptions) nature of adakite magmas. Cretaceous adakites from the Stanovoy Suture Zone in Far East Russia contain Cu–Ag–Au and Cu–Zn–Mo–Ag alloys, native Au and Pt, cupriferous Ag in association witn barite and Ag-chloride. Stanovoy adakites also have systematically higher Au contents in comparison with volcanic arc magmas, suggesting that ore-forming hydrothermal fluids responsible for Cu–Au(Mo–Ag) porphyry and epithermal mineralization in upper crustal environments could have been exsolved from metal-saturated, H2O–S–Cl-rich adakite magmas. The interaction between depleted mantle peridotites and metal-rich adakites appears to be capable of producing (under a certain set of conditions) fertile sources for HNB melts connected with some epithermal Au (Porgera) and porphyry Cu–Au–Mo (Tibet, Iran) mineralized systems in modern and ancient subduction zones.

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