Isotopic characteristics of the ermakovskoe fluorite–bertrandite–phenakite deposit (Western Transbaikalia)

Рипп, Г. С.; Избродин, И. А.; Ласточкин, Е. И.; Doroshkevich, A. G.; Рампилов, М. О.; Посохов, В. Ф.

doi:10.1134/s0016702916090056

Cited by 2 publications

(4 citation statements)

References 14 publications

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“…This is indicated by the sharp enrichment of carbonates of F-Be ores with low δ 18 O values up to -2.5... +2.0 ‰ δ 18 О with 15-22 ‰ in limestones (dolomites). The low δ 18 O values (mostly less than 3-5‰) are also recorded in other (including beryllium) minerals of the ore phase (Ripp et al, 2016b).…”

Section: Discussionmentioning

confidence: 82%

“…7) are also low. This indicates the involvement of the meteor source in the formation of the ores (Ripp et al, 2016b) together with deuterium depletion of water from hydroxyl-bearing minerals (from -130 to -177‰δD), as well as calculations of the oxygen content of equilibrium water with ore paragenesis minerals (-2 ...…”

Section: Hydrothermalitesmentioning

confidence: 80%

“…Finally, the participation of meteor source water (Ripp et al, 2016b) in the fluids that formed the F-Be ores shows the need to explain its occurrence in the magmatic chamber and the mechanism for the release of such fluid. At least one model of its exudation, as a result of fractional crystallization, is no longer enough.…”

Section: Discussionmentioning

confidence: 99%

“…It is known that pegmatites (with their high fluid saturation) are often contain ore mineralization, representing an intermediate link between magmatites and hydrothermalites (Frezzotti, 2001;Lowenstern and Thompson, 1995;Roedder, 1992). Detailed isotopic studies (Ripp et al, 2016b) established the participation of meteoric waters in formation of the deposit.…”

Section: Introductionmentioning

confidence: 99%

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Relationship of F-Be mineralization to granites and syenites at the Ermakovka deposit (Western Transbaikalia)

Рипп

Избродин

Рампилов

et al. 2020

GeA

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The paper presents the mineralogical and geochemical characteristics of two groups of hydrothermalites and their relation with igneous rocks of the Ermakovka deposit. The first group includes F-Be ore bodies, occurring outside the granite massif. The second group is presented in veinlets with sulfates, phosphates, kaolinite, muscovite and hematite. It contains Rare Earth Elements (REE) mineralization (monazite, florencite, xenotime) and occurs within the massif. There are two different massifs of igneous rocks (granite and syenite) at the area of the deposit which have ages (226-227Ma) close to the age of hydrothermalites (225Ma). Each of them could be a source of F-Be-containing veins. This paper reviews the ore potential of these rocks. Itincludes a mineralogical study isotopic analyses of Sr, Nd and O, and trace, including rare-earth element compositions and age determination (U-Pb) of F-Be ores. The data obtained by us evidence that the fluid source of F-Be ores were syenites rather than granites. This is proven by the absence of Be-mineralization in granites and schlieren pegmatites, and a sharp difference in composition of their fluid phases. A reductive fluid specification forming F-Be ores (containing CH4, H2, N2, CO2 and H2S), contrasts sharply with fluid specification of granites. The granites are characterized by high oxygen fugacity, due to ferric iron, sulfates and phosphates. Besides isotopic composition of oxygen in quartz (7.4 and 5.1 ‰ δ18О V-SMOW respectively), initial Sr ratios (0.7056-0.7065 and 0.707-0.709 respectively) and REE compositions are different.

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Section: Discussionmentioning

confidence: 82%

Section: Hydrothermalitesmentioning

confidence: 80%

Section: Discussionmentioning

confidence: 99%