The Mongolo-Transbaikalian alkali-granite province stretches for about 2000 km and includes 350 plutons. The largest, Bryansky, pluton covers more than 1600 km2 and is made up of two almost coeval syenite-granite series: alkali-feldspar (AFS) (287 Ma) and peralkaline (PAS) (285 Ma). In the period between the AFS and PAS formation, a bimodal trachybasalt-comendite series erupted. Comendite is regarded as a volcanic rock comagmatic to peralkaline granites. Data on mineralogy and geochemistry of the granitoids suggest that the rocks in each series were produced by fractional crystallization in deep magma chambers. Although AFS and PAS are closely associated in space and time, there are no direct genetic links between them. Studies of melt inclusions (MI) in quartz and c1inopyroxene from peralkaline syenite, granite, and comendite show that the crystallization of syenitic magma commenced at T > 930–940 °C, which is much higher than the determined Iiquidus temperature of granitic melts (760–790 °C). Both the syenitic and highly silicic magmas were enriched in Cl (about 0.2–03 wt.%). As the fractional crystallization proceeded, the residual silicic melts became enriched in F, up to 1.5–1.7 wt.%. Based on a study of MI in comendite, the temperature of generation of peralkaline silicic magma has been estimated at > 1000 °C. Similar high temperatures have been established for other comendites of the province. This suggests that the silicic magma was generated at depths significantly greater than the normal crust thickness.
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Research Article|
August 01, 1999
GENESIS OF TWO SYENITE-GRANITE SERIES: BRYANSKY PLUTON (Transbaikalia)
A. N. Zanvilevich;
A. N. Zanvilevich
Geological Institute, Siberian Branch of the RAS, ul. Sakh’yanovoi 6a, Ulan Ude, 670047, Russia
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B. A. Litvinovsky;
B. A. Litvinovsky
Geological Institute, Siberian Branch of the RAS, ul. Sakh’yanovoi 6a, Ulan Ude, 670047, Russia
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A. V. Titov;
A. V. Titov
*
United Institute of Geology, Geophysics and Mineralogy, Siberian Branch of the RAS, prosp. Akad. Koptyuga 3, Novosibirsk, 630090, Russia
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D. V. Kuz’min
D. V. Kuz’min
*
United Institute of Geology, Geophysics and Mineralogy, Siberian Branch of the RAS, prosp. Akad. Koptyuga 3, Novosibirsk, 630090, Russia
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A. N. Zanvilevich
Geological Institute, Siberian Branch of the RAS, ul. Sakh’yanovoi 6a, Ulan Ude, 670047, Russia
B. A. Litvinovsky
Geological Institute, Siberian Branch of the RAS, ul. Sakh’yanovoi 6a, Ulan Ude, 670047, Russia
A. V. Titov
*
United Institute of Geology, Geophysics and Mineralogy, Siberian Branch of the RAS, prosp. Akad. Koptyuga 3, Novosibirsk, 630090, Russia
D. V. Kuz’min
*
United Institute of Geology, Geophysics and Mineralogy, Siberian Branch of the RAS, prosp. Akad. Koptyuga 3, Novosibirsk, 630090, Russia
Publisher: Novovsibirsk State University
Received:
22 May 1998
First Online:
15 Oct 2024
Online ISSN: 1878-030X
Print ISSN: 1068-7971
© 2000 by Allerton Press, Inc.
Allerton Press, Inc.
Russ. Geol. Geophys. (1999) 40 (8): 1177–1194.
Article history
Received:
22 May 1998
First Online:
15 Oct 2024
Citation
A. N. Zanvilevich, B. A. Litvinovsky, A. V. Titov, D. V. Kuz’min; GENESIS OF TWO SYENITE-GRANITE SERIES: BRYANSKY PLUTON (Transbaikalia). Russ. Geol. Geophys. 1999;; 40 (8): 1177–1194. doi:
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Index Terms/Descriptors
- A-type granites
- Asia
- Buryat Russian Federation
- chemical composition
- chlorine
- Cisuralian
- comendite
- Commonwealth of Independent States
- fluid inclusions
- fluorine
- fractional crystallization
- geochemistry
- granites
- halogens
- homogenization
- igneous rocks
- inclusions
- intrusions
- lithogeochemistry
- Lower Permian
- magmas
- magmatic differentiation
- major elements
- mass balance
- melt inclusions
- metals
- mineral composition
- Paleozoic
- peralkalic composition
- Permian
- plutonic rocks
- plutons
- rare earths
- rhyolites
- Russian Federation
- syenites
- temperature
- trace elements
- Transbaikalia
- volatile elements
- volcanic rocks
- Mongol-Okhotsk Belt
- Bryansky Pluton
Latitude & Longitude
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