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Journal Article

Differentiation of Lamproitic Magma: Case Study of Mesozoic High-K Dikes of the Ryabinovyi Massif (Central Aldan) Available to Purchase

A.E. Izokh, I.F. Chayka, I.V. Gaskov, V.V. Egorova
Published: 01 February 2024
Russ. Geol. Geophys. (2024) 65 (2): 195–213.
DOI: https://doi.org/10.2113/RGG20234610
...A.E. Izokh; I.F. Chayka; I.V. Gaskov; V.V. Egorova Abstract ––Studies of the mineral–petrographic and geochemical compositions of high-potassic lamprophyric dikes of the Tobuk complex, manifested at the Ryabinovyi plutonic massif (Central Aldan Mesozoic magmatic province, Russia), have shown...
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View PDF for article title, Differentiation of Lamproitic Magma: Case Study of Mesozoic High-K Dikes of the <span class="search-highlight">Ryabinovyi</span> <span class="search-highlight">Massif</span> (Central Aldan)
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Journal Article

Shonkinites and minettes of the Ryabinovyi massif ( Central Aldan ): composition and crystallization conditions Available to Purchase

E.Yu. Rokosova, L.I. Panina
Published: 01 June 2013
Russ. Geol. Geophys. (2013) 54 (6): 613–626.
DOI: https://doi.org/10.1016/j.rgg.2013.04.011
...E.Yu. Rokosova; L.I. Panina Abstract Dikes of biotitic shonkinites and minettes of the complex Ryabinovyi alkaline massif (Central Aldan) have been studied. The dikes are localized in a neck of K-picrites in the northeast of the massif, which intrudes gold-bearing microcline–muscovite metasomatites...
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View PDF for article title, Shonkinites and minettes of the <span class="search-highlight">Ryabinovyi</span> <span class="search-highlight">massif</span> ( Central Aldan ): composition and crystallization conditions
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Schematic geological map of the Ryabinovyi massif after (Shatov et al., 2012). A – Scheme showing the location of dikes of the Tobuk complex in the Muskovitovyi area, according to our data with regard to satellite images. B: 1 – Proterozoic basement (metamorphic complex); 2 – Vendian–Cambrian sedimentary rocks; 3 – Jurassic sedimentary rocks; 4–6 – Aldan intrusive complex: 4 – shonkinites, fergusites; 5 – porphyric aegirine–augite alkali–feldspar syenites (phase I); 6 – alkali–feldspar syenites (phase II); 7–9 – Tobuk dike complex: 7 – eruptive breccia with the matrix composed of olivine–diopside–phlogopite and diopside–phlogopite lamproites; 8 – minettes; 9 – syenite–porphyry; 10 – faults; 11 – sample number. Inset shows the study area.

Schematic geological map of the Ryabinovyi massif after ( Shatov et al., 20... Available to Purchase

Published: 01 February 2024
Fig. 2. Schematic geological map of the Ryabinovyi massif after ( Shatov et al., 2012 ). A – Scheme showing the location of dikes of the Tobuk complex in the Muskovitovyi area, according to our data with regard to satellite images. B : 1 – Proterozoic basement (metamorphic complex); 2
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Photomicrographs of rocks of the lamproite series of the Ryabinovyi massif. A, B, D – Transmitted light; C, E, F – crossed nicols.

Photomicrographs of rocks of the lamproite series of the Ryabinovyi massif.... Available to Purchase

Published: 01 February 2024
Fig. 4. Photomicrographs of rocks of the lamproite series of the Ryabinovyi massif. A , B , D – Transmitted light; C , E , F – crossed nicols.
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Compositions of olivines from olivine lamproites of the Ryabinovyi massif. 1 – macrocrysts and homogeneous cores of the phenocrysts (deep-chamber generation); 2 – zoned phenocrysts; 3 – thin rims of phenocrysts. Compositional fields for the low-Ti lamproites of the Mediterranean belt and northern Vietnam are shown by a solid line, and those for high-Ti lamproites worldwide are shown by a dashed line. Data for the fields are from the GeoRoc database (accessed September 2019), Prelević and Foley (2007), Tran et al. (1997), Mitchell et al. (1987), and our unpublished materials.

Compositions of olivines from olivine lamproites of the Ryabinovyi massif. ... Available to Purchase

Published: 01 February 2024
Fig. 7. Compositions of olivines from olivine lamproites of the Ryabinovyi massif. 1 – macrocrysts and homogeneous cores of the phenocrysts (deep-chamber generation); 2 – zoned phenocrysts; 3 – thin rims of phenocrysts. Compositional fields for the low-Ti lamproites of the Mediterranean
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Compositions of clinopyroxenes from dike rocks of the Ryabinovyi massif. 1 – Ol–Di–Phl lamproites; 2 – Di–Phl lamproites; 3 – minettes; 4 – syenite–porphyry and microsyenites. Compositional fields for clinopyroxenes from the other lamproitic rocks: 5 – lamproites of the other Mesozoic occurrences in the Aldan Shield (Bogatikov, 1991); 6 – low-Ti Mediterranean belt lamproites (GeoRoc data, accessed 20 June 2023); 7 – high-Ti lamproites worldwide (GeoRoc data, accessed 20 June 2023). Classification fields on plot a are after (Morimoto, 1989).

Compositions of clinopyroxenes from dike rocks of the Ryabinovyi massif. 1... Available to Purchase

Published: 01 February 2024
Fig. 10. Compositions of clinopyroxenes from dike rocks of the Ryabinovyi massif. 1 – Ol–Di–Phl lamproites; 2 – Di–Phl lamproites; 3 – minettes; 4 – syenite–porphyry and microsyenites. Compositional fields for clinopyroxenes from the other lamproitic rocks: 5 – lamproites of the other
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Compositions of micas from dike rocks of the Ryabinovyi massif. 1 – Ol–Di–Phl lamproites; 2 – Di–Phl lamproites; 3 – minettes; 4 – syenite–porphyry and microsyenites. Compositional fields for micas from the other lamproitic rocks: 5 – lamproites of the other Mesozoic occurrences in the Aldan Shield (Bogatikov, 1991); 6 – low-Ti Mediterranean belt lamproites (GeoRoc data, accessed 20 June 2023); 7 – high-Ti lamproites worldwide (GeoRoc data, accessed 20 June 2023). Classification fields on plot A are after (Rieder et al., 1998).

Compositions of micas from dike rocks of the Ryabinovyi massif. 1 – Ol–Di... Available to Purchase

Published: 01 February 2024
Fig. 11. Compositions of micas from dike rocks of the Ryabinovyi massif. 1 – Ol–Di–Phl lamproites; 2 – Di–Phl lamproites; 3 – minettes; 4 – syenite–porphyry and microsyenites. Compositional fields for micas from the other lamproitic rocks: 5 – lamproites of the other Mesozoic
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Geological scheme of the Ryabinovyi massif, after Maximov et al. (2010). 1 – Quaternary loose deposits; 2 – Jurassic terrigenous deposits; 3 – Vendian–lower Cambrian limestones of the platform cover; 4 – pre-Riphean metamorphic complex of the crystalline basement; 5–7 – intrusive alkaline rocks of the Aldan Complex: 5 – aegirine and aegirine–augite syenites; 6 – muscovitized feldspathic и and pseudoleucite syenites; 7 – shonkinites, fergusites; 8 – alkali-feldspathic trachytes and their breccias, sölvsbergite porphyry; 9 – sericite–microcline metasomatites after the massif and basement rocks (phenites); 10 – skarns; 11, 12 – Tobuk dike complex: lamprophyre dikes, potassic picrite basalt dikes and necks (11); syenite porphyry, orthophyre, sölvsbergite, grorudite, and tinguaite dikes (12); 13 – dislocations; 14 – deposits: I – Muskovitovoe, II – Novoe, III – Lagernoe ore occurrence.

Geological scheme of the Ryabinovyi massif, after Maximov et al. ( 2010 ). ... Available to Purchase

Published: 01 February 2023
Fig. 3. Geological scheme of the Ryabinovyi massif, after Maximov et al. ( 2010 ). 1 – Quaternary loose deposits; 2 – Jurassic terrigenous deposits; 3 – Vendian–lower Cambrian limestones of the platform cover; 4 – pre-Riphean metamorphic complex of the crystalline basement; 5 – 7
Journal Article

Chronology of Alkaline Magmatism and Gold Mineralization in the Central Aldan Ore District (Southern Yakutia) Available to Purchase

I.V. Gaskov, A.S. Borisenko, I.D. Borisenko, A.E. Izokh, A.V. Ponomarchuk
Published: 01 February 2023
Russ. Geol. Geophys. (2023) 64 (2): 175–191.
DOI: https://doi.org/10.2113/RGG20214427
...Fig. 3. Geological scheme of the Ryabinovyi massif, after Maximov et al. ( 2010 ). 1 – Quaternary loose deposits; 2 – Jurassic terrigenous deposits; 3 – Vendian–lower Cambrian limestones of the platform cover; 4 – pre-Riphean metamorphic complex of the crystalline basement; 5 – 7...
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View PDF for article title, Chronology of Alkaline Magmatism and Gold Mineralization in the Central Aldan Ore District (Southern Yakutia)
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Major-component variation plots for rocks of the Tobuk complex, Ryabinovyi massif, vs. other lamproitic and alkaline–ultramafic rocks and mineral fractionation trends. A – Total alkali–silica classification chart (Le Maitre et al., 2005); B – K2O–Na2O covariations for rocks of the Tobuk complex, Ryabinovyi massif; C, D – MgO vs. Al2O3 and MgO vs. CaO binary plots; E – MgO–CaO–Al2O3 ternary (modified after (Fershtater et al., 1999)). 1–12: 1 – Ol–Di–Phl lamproites; 2 – Di–Phl lamproites; 3 – minettes; 4 – carbonate-rich minette; 5 – microsyenites and syenite–porphyry; 6 – melt inclusion in olivine I52-12 (Chayka et al., 2020); 7 – groundmass of the most primitive lamproite (I52-12); 8 – lamproites and lamprophyres of northern Vietnam; 9 – lamproites of sills of the Yakokut massif (Krivenko, 1980); 10 – rocks of the Inagli massif; 11 – compositional points for minerals; 12 – trends of melt fractionation during the crystallization of olivine (Ol), phlogopite (Phl), and clinopyroxene (Cpx).

Major-component variation plots for rocks of the Tobuk complex, Ryabinovyi ... Available to Purchase

Published: 01 February 2024
Fig. 12. Major-component variation plots for rocks of the Tobuk complex, Ryabinovyi massif, vs. other lamproitic and alkaline–ultramafic rocks and mineral fractionation trends. A – Total alkali–silica classification chart ( Le Maitre et al., 2005 ); B – K 2 O–Na 2 O covariations for rocks
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Mg-Fe2+–Ca composition diagram for clinopyroxenes from the rocks of the Ryabinovyi massif (Dobretsov et al., 1971).

Mg-Fe 2+ –Ca composition diagram for clinopyroxenes from the rocks of the R... Available to Purchase

Published: 01 June 2013
Fig. 3. Mg-Fe 2+ –Ca composition diagram for clinopyroxenes from the rocks of the Ryabinovyi massif ( Dobretsov et al., 1971 ).
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Trace-element composition plots of rocks of the Tobuk complex, Ryabinovyi massif. A – Primitive-mantle-normalized (Lyubetskaya and Korenaga, 2007) spidergram of the average compositions of the studied rocks; B – chondrite (C1)-normalized (McDonough and Sun, 1995) average REE spectra. A–F – see explanations in the text.

Trace-element composition plots of rocks of the Tobuk complex, Ryabinovyi m... Available to Purchase

Published: 01 February 2024
Fig. 13. Trace-element composition plots of rocks of the Tobuk complex, Ryabinovyi massif. A – Primitive-mantle-normalized ( Lyubetskaya and Korenaga, 2007 ) spidergram of the average compositions of the studied rocks; B – chondrite (C1)-normalized ( McDonough and Sun, 1995 ) average REE
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SEM BSE photomicrographs of zoned crystals of the rock-forming minerals from rocks of the lamproite series of the Ryabinovyi massif. A – A clinopyroxene microlith from the groundmass of the olivine–diopside–phlogopite lamproite; B – partially resorbed phenocryst of clinopyroxene from the microsyenite; C – phlogopite phenocryst from a minette; D – zoned crystal of K-felspar from the microsyenite.

SEM BSE photomicrographs of zoned crystals of the rock-forming minerals fro... Available to Purchase

Published: 01 February 2024
Fig. 9. SEM BSE photomicrographs of zoned crystals of the rock-forming minerals from rocks of the lamproite series of the Ryabinovyi massif. A – A clinopyroxene microlith from the groundmass of the olivine–diopside–phlogopite lamproite; B – partially resorbed phenocryst of clinopyroxene from
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SEM BSE photomicrographs of carbonate assemblages in rocks of the lamproite series of the Ryabinovyi massif. A – Interstitial calcite in the minette groundmass; B – rock-forming dolomite and calcite in the carbonate-rich minette (I57/1-12); C – a carbonate globule surrounded by phlogopite tables in microsyenite. Ap – apatite; Mag – magnetite; Kfsp – K-feldspar; Phl – phlogopite; Ccp – chalcopyrite; Tfphl – tetraferriphlogopite; Cal – calcite; Dol – dolomite; Aeg – aegirine.

SEM BSE photomicrographs of carbonate assemblages in rocks of the lamproite... Available to Purchase

Published: 01 February 2024
Fig. 5. SEM BSE photomicrographs of carbonate assemblages in rocks of the lamproite series of the Ryabinovyi massif. A – Interstitial calcite in the minette groundmass; B – rock-forming dolomite and calcite in the carbonate-rich minette (I57/1-12); C – a carbonate globule surrounded
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Compositions of clinopyroxene (a–c) and phlogopite (d–f) from rocks of the Bilibin massif on chemical variation plots. The solid line outlines the compositional fields of minerals from low-Ti lamproites; the dashed line, the compositional fields of minerals from high-Ti lamproites worldwide, according to the GeoRoc database. The fields on classification diagram b are according to Morimoto [1989], and those on classification diagram d are according to Rieder et al. [1998]. 1 – phlogopite clinopyroxenites; 2 – melashonkinites; 3 – shonkinites; 4 – alkali syenite; 5 – quartz syenites; 6 – granites; 7 – dikes of the lamproite series of the Ryabinovyi massif. Aeg-Aug – Aegirine-augite; Di/Aug – diopside/augite; Hed/Aug – hedenbergite/augite.

Compositions of clinopyroxene ( a – c ) and phlogopite ( d – f ) from rocks... Available to Purchase

Published: 01 April 2025
– quartz syenites; 6 – granites; 7 – dikes of the lamproite series of the Ryabinovyi massif. Aeg-Aug – Aegirine-augite; Di/Aug – diopside/augite; Hed/Aug – hedenbergite/augite.
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Compositions of olivine (a–c) and Cr-spinel (d–i) from the rocks of the Bilibin massif. The solid line outlines the contours of the composition fields of minerals from low-Ti lamproites; the dotted line, from high-Ti lamproites of the world, according to the data of [Mitchell et al., 1987; Hoa et al., 1997; Prelević and Foley, 2007], the GeoRoc database, and our unpublished data. From here on, Mg# = Mgmol/(Mgmol + Fe2+mol); Cr# = Crmol/(Crmol + Almol). Classification of Cr-spinel is according to [Bosi et al., 2019]. 1 – phlogopite clinopyroxenite; 2 – melashonkinites; 3 – shonkinite; 4 – lamproite-series rocks of the Ryabinovyi massif [Chayka et al., 2020; Izokh et al., 2024].

Compositions of olivine ( a – c ) and Cr-spinel ( d – i ) from the rocks of... Available to Purchase

Published: 01 April 2025
– melashonkinites; 3 – shonkinite; 4 – lamproite-series rocks of the Ryabinovyi massif [ Chayka et al., 2020 ; Izokh et al., 2024 ].
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Inner structure and zoning of the selected olivine phenocrysts from lamproites of the Tobuk complex, Ryabinovyi massif, revealed by EPMA and element mapping. A – A phenocryst with a high-Mg homogeneous core derived from a deep chamber; B – a phenocryst with a resorbed low-Al, low-P relic of mantle olivine. The compositional profiles are shown by the arrows on the maps. Individual spot analyses are listed in Table 2. The data and, partially, maps are taken from our recent paper (Chayka et al., 2020); for the conditions of mapping and spot analyses, refer to (Batanova et al., 2015; Chayka et al., 2020).

Inner structure and zoning of the selected olivine phenocrysts from lamproi... Available to Purchase

Published: 01 February 2024
Fig. 6. Inner structure and zoning of the selected olivine phenocrysts from lamproites of the Tobuk complex, Ryabinovyi massif, revealed by EPMA and element mapping. A – A phenocryst with a high-Mg homogeneous core derived from a deep chamber; B – a phenocryst with a resorbed low-Al, low-P
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Trace-element spectra of the Bilibin massif rocks normalized to the compositions of the primitive mantle (PM) [Sun and McDonough, 1989] (a, c, and e) and CI chondrite [McDonough and Sun, 1995] (b, d, and f). g and h are, respectively, PM- and CI-normalized spectra of the average compositions of the Bilibin massif rock varieties. The compositional field of the lamproite-series rocks of the Ryabinovyi massif is according to [Vladykin, 1997; Davies et al., 2006; Izokh et al., 2024]; that of low-Ti lamproites of the Mediterranean is according to the GeoRoc database; that of continental crust is according to [Rudnick and Gao, 2003]; and that of Mesozoic granites of the southern Aldan–Stanovoy Shield is according to [Strikha, 2005; Kukuschkin et al., 2015]. 1 – phlogopite clinopyroxenites; 2 – melashonkinites; 3 – shonkinites; 4 – alkali syenite; 5 – quartz syenites; 6 – granites; 7 – lamproite-series rocks of the Aldan Shield; 8 – low-Ti lamproites of the Mediterranean; 9 – continental crust; 10 – Mesozoic granites of the southern Aldan–Stanovoy Shield.

Trace-element spectra of the Bilibin massif rocks normalized to the composi... Available to Purchase

Published: 01 April 2025
of the average compositions of the Bilibin massif rock varieties. The compositional field of the lamproite-series rocks of the Ryabinovyi massif is according to [ Vladykin, 1997 ; Davies et al., 2006 ; Izokh et al., 2024 ]; that of low-Ti lamproites of the Mediterranean is according to the GeoRoc database
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Chemical variation plots of Cr-spinel from lamproites of the Ryabinovyi massif. 1 – olivine-hosted crystal inclusions; 2 – clinopyroxene-hosted crystal inclusions; 3 – chromite phenocrysts; 4 – rims of chromite phenocrysts. Compositional fields for Cr-spinel from the low-Ti lamproites of the Mediterranean belt and northern Vietnam are shown by a solid line, and those for high-Ti lamproites worldwide are shown by a dashed line. Data for the fields are from Conticelli and Peccerillo (1992), Venturelli et al. (1991), Prelević et al. (2005), Prelević and Foley (2007), Semiz et al. (2015), Jaques (2016), and Cambeses et al. (2016).

Chemical variation plots of Cr-spinel from lamproites of the Ryabinovyi mas... Available to Purchase

Published: 01 February 2024
Fig. 8. Chemical variation plots of Cr-spinel from lamproites of the Ryabinovyi massif. 1 – olivine-hosted crystal inclusions; 2 – clinopyroxene-hosted crystal inclusions; 3 – chromite phenocrysts; 4 – rims of chromite phenocrysts. Compositional fields for Cr-spinel from the low-Ti
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Composition of rocks and inclusion glasses in minerals of Aldan lamproitic rocks, lamproites and K-basaltoids in the coordinates: (A) (SiO2/Al2O3) – (100 FeO/(FeO + MgO + TiO2)), (B) (K2O + Na2O) – Al2O3 – (MgO + CaO + FeO). Large marks are for composition of rocks, and small marks for the composition of inclusion glasses in minerals: 1–4 – Aldan lamproites (1 – Molbo River, 2 – Yakokut Massif and Upper-Yakokut Depression, 3 – Muron Massif, 4 – Ryabinovyi Massif: based on data from Table 3); 5 – lamproites of Western Australia, USA, Spain [1, 18–21]; 6 – K-basaltoids of Siberia, Armenia, Eifel (Germany) [4, 22]. The arrows show evolution trends for initial melts during crystallization.

Composition of rocks and inclusion glasses in minerals of Aldan lamproitic ... Available to Purchase

Published: 01 January 1997
, and small marks for the composition of inclusion glasses in minerals: 1 – 4 – Aldan lamproites ( 1 – Molbo River, 2 – Yakokut Massif and Upper-Yakokut Depression, 3 – Muron Massif, 4 – Ryabinovyi Massif: based on data from Table 3 ); 5 – lamproites of Western Australia, USA, Spain [ 1 , 18 – 21