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Gorbatova E. A. Kholodnov V. V. Pirogov B. I. Kolkova M. S. Shagalov E. S. 《Geology of Ore Deposits》2021,63(5):431-453
Geology of Ore Deposits - The experimental works of Russian and foreign researchers focused on the behavior of ore minerals, such as titanomagnetite and ilmenite in an oxidizing environment in... 相似文献
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G. B. Fershtater A. A. Krasnobaev F. Bea P. Montero V. Ya. Levin V. V. Kholodnov 《Petrology》2009,17(5):503-520
This paper presents results of isotopic (Cameca IMS1270 NORDSIM and SHRIMP-II ion microprobes) and geochemical (LA-ICP MS)
study of zircons in three dunite samples of the Uralian-Alaskan-type massifs of the Urals: Kosva, Sakharin, and Eastern Khabarny.
The zircons in the dunites share common features. Each sample contains the following genetic and age groups of zircons: (1)
xenogenic zircons of the Archean and Proterozoic age; (2) zircons of magmatic appearance, which in age and geochemistry are
close to the zircons from associated gabbroids; (3) postmagmatic zircons that presumably crystallized from hydrothermal solutions.
The xenogenic zircons of the Archean age in each of three samples comprise transparent fragments, which are depleted in U
and other trace elements and presumably have mantle origin. Xenogenic zircons of the Proterozoic age (1500–2000 Ma) occur
as oval grains with surface abrasion, the traces of their redeposition. The geochemical features of the xenogenic zircons
unequivocally demonstrate their affiliation to the continental crust—the basement of the Uralian orogen.
The zircons of magmatic habit in all the dunite samples are close in age to the associated gabbroids: 435–432 Ma in the Kosva
Massif, 378–374 in the Sakharin Massif, and 407–402 Ma in the Eastern Khabarny Massif, and mark the age of dunite formation.
In addition, the magmatic zircons from dunites and associated gabbroids share similar geochemical features. These data could
serve as additional argument in support of cumulate origin of dunites in the Uralian-Alaskan-type complexes. The postmagmatic
zircons are most enriched in trace elements and were presumably formed from a fluid phase, which was responsible for the recrystallization
of dunites and redistribution of Cr-spinel and PGE mineralization. 相似文献
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G. B. Fershtater V. V. Kholodnov A. A. Kremenetsky A. A. Krasnobaev N. S. Borodina E. A. Zin’kova S. V. Pribavkin 《Geology of Ore Deposits》2010,52(1):58-76
Gabbro-tonalite-granodiorite-granite (GTGG) plutons productive for gold are suprasubduction intrusive bodies formed at an
Andean-type active continental margin 410–380, 365–355, and 320–290 Ma ago. The Devonian plutons are situated in the southeastern
marginal continental zone, whereas the Carboniferous plutons occur in the northwestern zone. All GTGG plutons are mantle-crustal.
Their formation started with hydrous basic magmatism and was accompanied by such magmatism up to the final stage. Mantle-derived
amphibole gabbro and diorite experienced partial melting (anatexis) in the lower crust under a pressure of 6–10 kbar, giving
birth to the tonalite-granodiorite members of the GTGG series. The latter, in turn, were involved in anatexis with the formation
of adamellite and granite, immediately accompanied by hydrothermal gold mineralization. The multistep anatexis is the main
petrogenetic process responsible for the gold resource potential of GTGG plutons. In the process of anatexis occurring under
high fluid saturation, gold was repeatedly removed from rocks into fluid, facilitating its concentration in ore deposits. 相似文献
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