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Saizyral Dike

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Occurrence frequency histograms of plagioclase of different compositions (mol. % An) in composite dikes of Western Sangilen: a, basite, b, salic components. The curves of probability density distribution: 1, Tavyt-Dag dike; 2, Saizyral dike. The composition of rock-forming minerals (Fig. 3–5) was determined using a LEO-1430VP scanning electron microscope fitted with an INCA Energy energy-dispersive spectrometer. Determination was carried out in polished rock thin sections with the selection of the freshest grains. Grains of ground mass and zonal grains (center, intermediate zone, edge) were separately analyzed for plagioclase. The curves of probability density distribution were plotted with the aid of the ISOPLOT software (Ludwig, 2003).

Occurrence frequency histograms of plagioclase of different compositions (m... Available to Purchase

Published: 01 January 2019
Fig. 3. Occurrence frequency histograms of plagioclase of different compositions (mol. % An) in composite dikes of Western Sangilen: a , basite, b , salic components. The curves of probability density distribution: 1 , Tavyt-Dag dike; 2 , Saizyral dike. The composition of rock-forming
Journal Article

Geological Position, Sources, and Age of Mingling Dikes of the Northwestern Margin of the Tuva–Mongolian Massif in Western Sangilen, Southeastern Tuva Available to Purchase

V.A. Yakovlev, I.V. Karmysheva, V.G. Vladimirov, D.V. Semenova
Published: 01 February 2024
Russ. Geol. Geophys. (2024) 65 (2): 214–232.
DOI: https://doi.org/10.2113/RGG20234589
... mingling dike and salic dikes are presented. Approximately ~485 Ma, high-potassium granitoid massifs formed simultaneously with the intrusion and occurrence of a complex of granitoid and mingling dikes. The Saizyral mingling dike resulted from the joint intrusion and mixing of basic and silicic magmas...
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Journal Article

Composition and U–Pb (LA-ICP-MS) Isotopic Age of Zircons from Composite Dikes of Western Sangilen (Tuva-Mongolian Orogen) Available to Purchase

A.A. Tsygankov, G.N. Burmakina, V.A. Yakovlev, V.B. Khubanov, V.G. Vladimirov, I.V. Karmysheva, M.D. Buyantuev
Published: 01 January 2019
Russ. Geol. Geophys. (2019) 60 (1): 45–66.
DOI: https://doi.org/10.15372/RGG2019004
...Fig. 3. Occurrence frequency histograms of plagioclase of different compositions (mol. % An) in composite dikes of Western Sangilen: a , basite, b , salic components. The curves of probability density distribution: 1 , Tavyt-Dag dike; 2 , Saizyral dike. The composition of rock-forming...
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View PDF for article title, Composition and U–Pb (LA-ICP-MS) Isotopic Age of Zircons from Composite <span class="search-highlight">Dikes</span> of Western Sangilen (Tuva-Mongolian Orogen)
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Internal structure of the Saizyral mingling dike. a – general view of the dike, vertical wall (lower [I], middle [II], and upper [III] parts of the dike); b, c – separation structures in the middle part of the dike; d – hybrid rocks and biotite clots in granites of the middle part of the dike; d – secant contact of the dike granites with host rocks. The dotted line indicates the boundaries of the mingling dike (a), contacts of leucogranites and host gneiss granites (e). Arrows (b, c) show the direction of separation of mafic fragments.

Internal structure of the Saizyral mingling dike. a – general view of the... Available to Purchase

Published: 01 February 2024
Fig. 2. Internal structure of the Saizyral mingling dike. a – general view of the dike, vertical wall (lower [I], middle [II], and upper [III] parts of the dike); b , c – separation structures in the middle part of the dike; d – hybrid rocks and biotite clots in granites of the middle part
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Internal structure components of composite dikes (dark-colored, basite, light-colored, salic components). Saizyral area (I): а, general layout of outcropping (position of the dike contact with host plagiogranite-gneiss is presented with a dashed line in the upper left corner of the drawing); the marginal part of the dike is salic (leucogranite); the central part is mostly basite; the most typical mingling structures (rounded nodules enclosed in leucogranite matrix and concentrated in the transition area from the basite part to the salic one (the central part of the drawing); the outcropping is about 3 m high; (b) the most typical mingling texture (Saizyral site), ovate-oblong basite (dark-colored) nodules with scalloped edges “cemented” with leucogranite. Tavyt-Dag site (II): c, d, cross-section of the composite dike. The internal reticulate structure of the dike is made of leucogranite “veinlet” tissue; e, basite apophyse in gneissose granites of the Matut pluton; the contact of the dike and its apophyse cuts gneissic banding of the host rocks near at the right angle; f, a hybrid zone on the contact of the composite dike with host rocks. Further details are given in the text of the study.

Internal structure components of composite dikes (dark-colored, basite, lig... Available to Purchase

Published: 01 January 2019
Fig. 2. Internal structure components of composite dikes (dark-colored, basite, light-colored, salic components). Saizyral area (I): а , general layout of outcropping (position of the dike contact with host plagiogranite-gneiss is presented with a dashed line in the upper left corner
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Diagrams with concordia for zircons from the rocks of composite dikes and host formations of Western Sangilen. Saizyral site: a, gneissose granites of the Erzin tectonic zone, b, salic, c, basite components of the composite dike; Tavyt-Dag site: d, granites of Matut pluton, e, salic, f, basite components of the composite dike. Error values for the given U–Pb dating correspond to 95% confidence interval (±2σ).

Diagrams with concordia for zircons from the rocks of composite dikes and h... Available to Purchase

Published: 01 January 2019
Fig. 9. Diagrams with concordia for zircons from the rocks of composite dikes and host formations of Western Sangilen. Saizyral site: a , gneissose granites of the Erzin tectonic zone, b , salic, c , basite components of the composite dike; Tavyt-Dag site: d , granites of Matut pluton, e
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Classification diagram with imaging points for amphibole composition from the basite component of the composite dikes (Leake et al., 1997) (а) and diagram of the relation TiO2–Mg/(Mg + Fe2+) (b). 1, Saizyral; 2, Tavyt-Dag.

Classification diagram with imaging points for amphibole composition from t... Available to Purchase

Published: 01 January 2019
Fig. 4. Classification diagram with imaging points for amphibole composition from the basite component of the composite dikes ( Leake et al., 1997 ) ( а ) and diagram of the relation TiO 2 –Mg/(Mg + Fe 2+ ) ( b ). 1 , Saizyral; 2 , Tavyt-Dag.
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TAS-diagram (SiO2–(Na2O + K2О)) (The Petrographic Code, 2009) (a) and K2O–SiO2 diagram (margins defined by (Rickwood, 1989)) (b) for the rocks of composite dikes of Western Sangilen and host formations. Saizyral site: 1, host gneiss-plagiogranites of the Erzin tectonic zone, 2, basite, 3, salic components of the composite dike; Tavyt-Dag site: 4, granites of the Matut pluton, 5, basite, 6, salic component of the composite dike.

TAS-diagram (SiO 2 –(Na 2 O + K 2 О)) ( The Petrographic Code, 2009 ) ( a )... Available to Purchase

Published: 01 January 2019
Fig. 6. TAS-diagram (SiO 2 –(Na 2 O + K 2 О)) ( The Petrographic Code, 2009 ) ( a ) and K 2 O–SiO 2 diagram (margins defined by ( Rickwood, 1989 )) ( b ) for the rocks of composite dikes of Western Sangilen and host formations. Saizyral site: 1 , host gneiss-plagiogranites of the Erzin tectonic
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Discrimination diagrams for basic and intermediate rocks of the Saizyral mingling dike. a – Nb/U – Nb diagram (Kapezhinskas et al., 1996); b – P2O5 – TiO2 diagram. Rock fields of volcanic arcs and NEB (Nb-enriched basalts) according to (Defant et al., 1992); c – Rb/Y – Nb/Y diagram (Pearce, 2008); d – Th/Yb – Nb/Yb diagram; (Yang et al., 2019). 1 – gabbro, 2 – diorite.

Discrimination diagrams for basic and intermediate rocks of the Saizyral mi... Available to Purchase

Published: 01 February 2024
Fig. 10. Discrimination diagrams for basic and intermediate rocks of the Saizyral mingling dike. a – Nb/U – Nb diagram ( Kapezhinskas et al., 1996 ); b – P 2 O 5 – TiO 2 diagram. Rock fields of volcanic arcs and NEB (Nb-enriched basalts) according to ( Defant et al., 1992 ); c – Rb/Y – Nb
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Classification diagrams. a – Na2O + K2O – SiO2 diagram (Middlemost, 1994); b – FeOgen./(FeOgen. + MgO) – SiO2 diagram (Frost et al., 2001); c – MALI – SiO2 diagram (Frost et al., 2001); d – A/NK – A/CNKdiagram, I, S line (Chappell and White, 2001). The rocks of the Saizyral mingling dike (1–4): 1 – gabbro, 2 – diorites, 3 – hybrid rocks, 4 – leucogranites; 5 – leucogranite dikes. The light gray field denotes the host gneiss granites of the Erzin metamorphic complex (Karmysheva et al., 2021), and the dark gray field shows the granitoids of the Ukhadag complex (Karmysheva et al., 2022).

Classification diagrams. a – Na 2 O + K 2 O – SiO 2 diagram ( Middlemost... Available to Purchase

Published: 01 February 2024
of the Saizyral mingling dike ( 1 – 4 ): 1 – gabbro, 2 – diorites, 3 – hybrid rocks, 4 – leucogranites; 5 – leucogranite dikes. The light gray field denotes the host gneiss granites of the Erzin metamorphic complex ( Karmysheva et al., 2021 ), and the dark gray field shows the granitoids of the Ukhadag
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Geological structure of Western Sangilen (southeasternTuva) (Karmysheva et al., 2017). 1, formations of the Tannuol island arc; metamorphic complexes (2–4): 2, Moren, 3, Lower Erzin, 4, Erzin migmatite-granite; 5, carbonate-terrigenous sedimentary cover (Sangilen Group); magmatic complexes and series (6–9): 6, Aktovrak dunite–harzburgite complex, 7, Pravyi Tarlashkin anorthosite-gabbronorite complex, 8, gabbros and 9, granitoids of the Bayankol gabbro–monzodiorite–granodiorite–granite complex; 10, gabbroids and 11, granitoids of the Bashkymugur gabbro–monzodiorite–granite–leucogranite complex; 12, tectonic zones: (er) Erzin, (ko) Kokmolgarga; 13, Agardag suture; 14, borders of overthrust mass; 15, faults; 16, tectonic blocks (13): 1, Tarlashkin, 2, Mugur-Chinchilig, 3, Erzin–Naryn. Insets: A, Location of Western Sangilen within the structure of the adjacent Siberian Platform (Kuzmichev, 2004); B, geological position of composite dikes (1, “Tavyt-Dag” site, 2, “Saizyral” site).

Geological structure of Western Sangilen (southeasternTuva) ( Karmysheva et... Available to Purchase

Published: 01 January 2019
of the adjacent Siberian Platform ( Kuzmichev, 2004 ); B , geological position of composite dikes (1, “Tavyt-Dag” site, 2, “Saizyral” site).