Formation stages of the large-scale noble metal mineralization in the Sukhoi Log deposit, east Siberia: Results of isotope-geochronological study

Лаверов, Н. П.; Чернышев, И. В.; Чугаев, А. В.; Bairova, E. D.; Gol’tsman, Yu. V.; Distler, V. V.; Yudovskaya, Marina A.

doi:10.1134/s1028334x07050339

Cited by 37 publications

(17 citation statements)

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“…The oldest tm values of 455 to 424 Ma were established for five pyrite samples (table, analyses 22-26) having the most primitive lead isotopic composition. Taking into account the abovementioned analytical uncertainty, these values are consistent with the Rb-Sr age (447 ± 6 Ma) of stringer-disseminated ore (Laverov et al, 2007 points corresponding to the pyrite cluster in the lower part of the trend immediately under the medium-crust curve of the Stacey-Kramers model (μ 2 = 238 U/ 204 Pb = 9.74) and in the curve of "orogen" in the Doe-Zartman plumbotectonics model (Fig. 2b).…”

Section: Resultssupporting

confidence: 78%

“…The Rb-Sr dating of hydrothermal alteration indicates that the formation of noble metal mineralization at the deposit is related to the Paleozoic tectonomagmatic activation (Laverov et a., 2007). This conclusion is consistent with the first determinations of lead isotopic composition of ore from gold deposits in the Lena province, including Sukhoi Log-type deposits with a Pb-Pb model age younger than 450 Ma (Neimark et al, 1993).…”

Section: Brief Characterization Of the Sukhoi Log Depositsupporting

confidence: 79%

“…The host rocks have been metasomatically altered (Rusinov et al, 2005). According to the available Rb-Sr data, gold mineralization formed in two stages (Laverov et al, 2007). Hydrothermal metasomatic alteration and the formation of stringer-disseminated gold-sulfide ore, whose reserves are about 1500 t Au (Karpenko et al, 2006), are related to the early stage (447 ± 6 Ma).…”

Section: Brief Characterization Of the Sukhoi Log Depositmentioning

confidence: 98%

“…This model is supported and developed by many researchers. Geological and Rb-Sr geochronological data, however, indicate that the deposit formed approximately 150 Ma later than the regional metamorphism of Upper Riphean terrigenouscarbonate complexes (Laverov et al, 2007). It was shown that the altered rocks in zones of stringer-disseminated gold mineralization and gold-bearing quartz veins are related to hydrothermal events of different age.…”

Section: Introductionmentioning

confidence: 97%

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Lead isotopic composition from data of high-precession MC-ICP-MS and sources of matter in the large-scale Sukhoi Log noble metal deposit, Russia

et al. 2009

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The lead isotopic composition of 33 sulfide samples from orebodies of the Sukhoi Log deposit was studied by high-precession MC-ICP-MS with a precision of ± 0.02% ( ± 2 SD from 120 analyses of the SRM 981 standard sample). The deposit is located in the Bodaibo gold mining district in the northern Baikal-Patom Highland. Gold mineralization is hosted in Neoproterosoic black slates. Variations of lead isotope ratios of the Sukhoi Log sulfides are generally typical of Phanerozoic deposits and ore fields. They are significant for 206 Pb / 204 Pb (17.903-18.674), moderate for 208 Pb / 204 Pb (37.822-38.457), and relatively narrow for 207 Pb / 204 Pb (15.555-15.679). In the Pb-Pb isotope diagrams, the data points of pyrite and galena constitute a linear trend. The points corresponding to pyrite from metasomatic ore occupy the left lower part of the trend. Galena from late gold-quartz veins shows more radiogenic Pb, and corresponding data points are located in the upper part of the trend. According to the Stacey-Kramers model, the end points of the trend, which is regarded as a mixing line, have μ 2 = 9.6 and μ 2 = 13.2 and model Pb-Pb ages 455 and 130 Ma, respectively. The isotope characteristics of ore lead, their relationships in pyrite and galena, and the mixing trend of Pb isotopic compositions are clearly tied to two Paleozoic stages in the formation of the Sukhoi Log deposit ( 447 ± 6 and 321 ± 14 Ma) and testify to the leading role of crustal sources, which are suggested as being the Neoproterozoic black-shale terrigenous-carbonate rocks.

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Section: Resultssupporting

confidence: 78%

Section: Brief Characterization Of the Sukhoi Log Depositsupporting

confidence: 79%

Section: Brief Characterization Of the Sukhoi Log Depositmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 97%

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Lead isotopic composition from data of high-precession MC-ICP-MS and sources of matter in the large-scale Sukhoi Log noble metal deposit, Russia

et al. 2009

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“…This model assumes gold extraction from the initially siderite-chalcophilic host rocks and refers to a common source of the veinlet-impregnated and quartz-vein types of the gold mineralization, which jointly occur in the ore bodies in Sukhoi Log-type deposits in the Baikal-Patom Highland. According to the geochronological studies conducted in the most studied field of Sukhoi Log, these types of gold mineralization occurred in significantly distant time intervals dated 447±5 and 321±14 Ma, respectively [Laverov et al, 2007]. The first dating is consistent with the occurrence of granitoids in the Mama formation (421±15 Ma, U-Pb dating, SHRIMP-II) [Zorin et al, 2008], and the second dating corresponds to the age of the Barguzin formation composing the Angara-Vitim batholith (330-310 Ma) [Tsygankov et al, 2007;.…”

Section: Introductionmentioning

confidence: 99%

Silurian age of major folding in Riphean deposits of the Baikal-patom zone

et al. 2008

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Introduction. The Lena gold province is one of the largest known gold resources in the world. The history of its exploration is long, but the genesis of gold mineralization hosted in black shales in the Bodaibo synclinorium still remains unclear. The studies face the challenge of discovering sources for the useful component and mechanisms of its redistribution and concentration. This study aims to clarify the time sequence of the ore mineralization in the Chertovo Koryto deposit on the basis of detailed mineralogical and geochemical characteristics of the ore, wallrock metasomatites and the Early Proterozoic host black shales, and to assess the applicability of the Sukhoi Log model for clarifying the Chertovo Koryto origin.Geological setting. The Lena gold province is located in the junction area of the Siberian platform and the Baikal mountain region (Fig. 1). The main element of its geological structure is the Chuya-Tonoda-Nechera anticline. Its axial segment is marked by horsts composed of the Early Proterozoic rocks with abundant granitoid massifs. The Chertovo Koryto deposit is located within the Kevakta ore complex at the Tonoda uplift, the largest tectonically disturbed block between the Kevakta and Amandrak granitoids massifs. The 150 m thick and 1.5 km long ore zone of the Chertovo Koryto deposit is confined to the hanging wall of the fold-fault zone feathering the Amandrak deep fault (Fig. 2).Composition. In the ore zone, rocks of the Mikhailovsk Formation include carbonaceous shales of the feldsparchlorite-sericite-quartz composition with nest-shaped ore accumulations of the pyrite-quartz composition and quartz veinlets. In our study, we distinguish five mineral associations resulting from heterochronous processes that sequentially replaced each other:-The earliest association related with the quartz-muscovite-sericite metasomatism and the removal of REE and other elements from the rocks and their partial redeposition; -Metamorphic sulphidization presented by scattered impregnations of pyrrhotite, as evidenced by small lenses of pyrrhotite, which are considerably elongated (axes up to 0.7 cm long) along the foliation planes (Figs 3, a, b); -Ore mineralization represented by a superimposed hydrothermal gold association with arsenopyrite ( Fig. 3, d); -Late chalcophilic mineralization formed at the final stage of hydrothermal-metasomatic process (Figs 3, e, f); -Post-ore silification. Geochemical characteristics. The geochemical study of rocks and ores from the Chertovo Koryto deposit show that the rocks of the Mikhailovsk Formation are characterized by higher contents of rock-forming elements, such as of Al2O3, Fe2O3total, MgO, K2O, and P2O5, in comparison to the PAAS standards [Condie, 1993] and the black shale standard composition (SChS-1) [Petrov et al., 2004]. A characteristic feature of the ore zone is that the contents of practically all the oxides, except SiO2, tend to decrease (Table 1). The distribution of rare elements repeats the pattern established for major elements. The least me...

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Fluid Inclusion Evidences for the P-T Conditions of Quartz Veins Formation in the Black Shale-Hosted Gold Deposits, Bodaybo Ore Region, Russia

2020

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Formation stages of the large-scale noble metal mineralization in the Sukhoi Log deposit, east Siberia: Results of isotope-geochronological study

Cited by 37 publications

References 2 publications

Lead isotopic composition from data of high-precession MC-ICP-MS and sources of matter in the large-scale Sukhoi Log noble metal deposit, Russia

Lead isotopic composition from data of high-precession MC-ICP-MS and sources of matter in the large-scale Sukhoi Log noble metal deposit, Russia

Silurian age of major folding in Riphean deposits of the Baikal-patom zone

Fluid Inclusion Evidences for the P-T Conditions of Quartz Veins Formation in the Black Shale-Hosted Gold Deposits, Bodaybo Ore Region, Russia

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