Isochron Re-Os age of gold from mayskoe gold-quartz vein deposit (Northern Karelia, Baltic Shield)

Бушмин, С. А.; Belyatsky, B. V.; Krymsky, R. Sh.; Глебовицкий, В. А.; Buiko, A. K.; Savva, E. V.; Сергеев, С. А.

doi:10.1134/s1028334x13010030

Cited by 12 publications

(12 citation statements)

References 9 publications

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“…Three groups of fluids inclusions were defined in quartz from the studied gold deposits ( Fluids of H 2 O-CO 2 composition with low salinity are favorable for formation of gold-only deposits in metamorphic complexes, because these fluids are able to mobilize Au from metamorphosed rocks and transport it in a form of Au-S complexes, but the content of base metals in these fluids is low [46,48]. Earlier we noted very high Au concentrations up to 202 ppm in fluids in the Porojarvi occurrence [39].…”

Section: Distribution and Timing Of Formation Of Gold Deposits In Thementioning

confidence: 92%

“…Pre-ore propylites formed 1770 ± 9 Ma (Rb-Sr, minerals and rock) [45]. Age of Mg-metasomatism is 1610 ± 30 Ma (Rb-Sr, minerals and rock) [39]. K-Ar age of feldspar in Si-K-Ba metasomatite was estimated 1380 ± 40 Ma [23].…”

Section: The Salla-kuolajarvi Beltmentioning

confidence: 99%

“…K-Ar age of feldspar in Si-K-Ba metasomatite was estimated 1380 ± 40 Ma [23]. Finally, Re-Os age of gold is 397 ± 15 Ma [39].…”

Section: The Salla-kuolajarvi Beltmentioning

confidence: 99%

“…The stage 1.87-1.70 Ga is revealed only in pre-ore regional propylitization, and other metasomatic processes are dated to be Middle Proterozoic (1.6-1.4 Ga). The Re-Os age of gold 397 ± 15 Ma [39] corresponds to the time of the Paleozoic tectonic activization and formation of alkaline ultramafic intrusions in the Kola region, but this dating needs to be verified, and may not actually be the time of formation of the deposit, but rather the time of gold recrystallization. Table 10.…”

Section: Distribution and Timing Of Formation Of Gold Deposits In Thementioning

confidence: 99%

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Gold Prospects in the Western Segment of the Russian Arctic: Regional Metallogeny and Distribution of Mineralization

et al. 2019

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Location of the deposits and occurrences of gold mineralization in metamorphic complexes of the Kola region is controlled by tectonic zones at the regional scale at the boundaries of major segments of the Fennoscandian Shield. Three zones are the most important: (1) the system of Neoarchean greenstone belts Kolmozero–Voron’ya–Ura-guba along the southern boundary of the Murmansk craton; (2) the suture, delineating the core of the Lapland–Kola orogeny in the north; and (3) the series of overthrusts and faults at the eastern flank of the Salla–Kuolajarvi belt. Gold deposits and occurrences are located within greenstone belts of Neoarchean and Paleoproterozoic age, and hosted by rocks of different primary compositions (mafic metavolcanics, diorite porphyry, and metasedimentary terrigenous rocks). The grade of metamorphism varies from greenschist to upper amphibolite facies, but the mineralized rocks are mainly lower amphibolite metamorphosed, close to the transition from greenschist to amphibolite facies. Gold deposits and occurrences in the northeastern part of the Fennoscandian Shield formed during two periods: the Neoarchean 2.7–2.6 Ga and the Paleoproterozoic 1.9–1.7 Ga. According to paleo-geodynamic reconstructions, these were the periods of collisional and accretionary orogeny in the region. Those Archean greenstone belts, which were reworked in the Paleoproterozoic (e.g., Strel’na and Tiksheozero belts), can contain gold deposits of Paleoproterozoic age.

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Section: Distribution and Timing Of Formation Of Gold Deposits In Thementioning

confidence: 92%

Section: The Salla-kuolajarvi Beltmentioning

confidence: 99%

“…K-Ar age of feldspar in Si-K-Ba metasomatite was estimated 1380 ± 40 Ma [23]. Finally, Re-Os age of gold is 397 ± 15 Ma [39].…”

Section: The Salla-kuolajarvi Beltmentioning

confidence: 99%

Section: Distribution and Timing Of Formation Of Gold Deposits In Thementioning

confidence: 99%

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Gold Prospects in the Western Segment of the Russian Arctic: Regional Metallogeny and Distribution of Mineralization

et al. 2019

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“…manifestations of these features simultaneously in the relationship. In terms of complex quantitative and qualitative features of mineral objects, the composition of mineral uniformity (in a brief reflection) is presented in the form of the following initial subcategories: I. Qualitative mineral uniformity, in which the quality of gold-bearing ores is manifested in the following indicators [6,7]: -level of gold content in mineral objects and formations; -uneven distribution of gold in them; -the fineness of gold particles and the difference in the shapes of gold; -Mineral purity of gold and other quality indicators. II.…”

Section: Mining Technological Homogeneitymentioning

confidence: 99%

Mining technological homogeneity and its composition

Sekisov

Yakimov

2018

E3S Web Conf.

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It is proposed with the initial justification, as a new scientific and production category in the field of development of deposits of solid minerals, it is noted - “Mining technological homogeneity”. At the same time, its high relevance, as well as the important role in the solution of the current problem of scientific and practical substantiation and in achieving a significant increase in the efficiency of the development of deposits of solid minerals, in the creation and rational use of innovative mining technologies. The system-complex composition of mining-technological mineral homogeneity as a subject conceptual-terminological category and, mainly, as a scientific and production activity associated with exploration, deposits of solid minerals is presented. The content of this category, as a scientific and industrial activity

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Pretreatment of Nitric Acid with Hydrogen Peroxide Reduces Total Procedural Os Blank to Femtogram Levels

et al. 2015

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Determining and correcting for background contributions of Re and Os from chemical reagents is critical for accurate and precise Re-Os dating of materials with parts per billion to parts per trillion Re and Os concentrations. Here we investigate reducing Os content in nitric acid, as it is the main contributor to the Os blank. Pretreating high-purity nitric acid with hydrogen peroxide (H2O2) significantly reduces nitric acid's Os contribution to femtogram levels, greatly reducing Os blank corrections. The improvement in background Os allows analysis of samples with extremely low Os concentrations (into the low ppt level). We present experimental data identifying key factors in reducing Os blank, including nitric acid to hydrogen peroxide volume ratios, wet versus dry glassware, and dark versus lighted reaction environments. These variables affect the reaction time between the two reagents, which in turn correlates inversely with the final Os content. The volume ratio of H2O2/HNO3 is shown to be the fundamental control on reaction time and final Os content, yielding a well-defined exponential relationship; minor variations in reaction time result from wet/dry glassware and light/dark reaction environment. At a H2O2/HNO3 volume ratio of ∼0.24, the total procedural Os blank is reduced from 6.5 pg (no H2O2) to 0.043 pg. The (187)Os/(188)Os of the Os blank ranges from 0.18 to 0.36, consistent with the Os blank compositions obtained by the AIRIE Program and other Re-Os laboratories worldwide, and is uncorrelated with any experimental variables. In contrast to Os, pretreatment with hydrogen peroxide did not improve the Re blank of nitric acid; Re background reduction requires conventional methods such as sub-boiling distillation.

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Isochron Re-Os age of gold from mayskoe gold-quartz vein deposit (Northern Karelia, Baltic Shield)

Cited by 12 publications

References 9 publications

Gold Prospects in the Western Segment of the Russian Arctic: Regional Metallogeny and Distribution of Mineralization

Gold Prospects in the Western Segment of the Russian Arctic: Regional Metallogeny and Distribution of Mineralization

Mining technological homogeneity and its composition

Pretreatment of Nitric Acid with Hydrogen Peroxide Reduces Total Procedural Os Blank to Femtogram Levels

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