Granitoids of the Altakhta Сomplex, the Eastern Part of the Bureya Continental Massif, Central Asian Fold Belt: Age, Geochemical Features, and Geodynamic Interpretations.
Saved in:
| Title: | Granitoids of the Altakhta Сomplex, the Eastern Part of the Bureya Continental Massif, Central Asian Fold Belt: Age, Geochemical Features, and Geodynamic Interpretations. |
|---|---|
| Authors: | Guryanov, V. A.1 (AUTHOR) guryanov_v@mail.ru, Nigai, E. V.1 (AUTHOR), Yurchenko, Yu. Yu.2 (AUTHOR), Arkhipov, M. V.1 (AUTHOR), Amelin, S. A.3 (AUTHOR), Arapov, V. N.3 (AUTHOR) |
| Source: | Russian Journal of Pacific Geology. Jul2021, Vol. 15 Issue 4, p325-344. 20p. |
| Subject Terms: | *Geological time scales, *Continental margins, *Geodynamics, *Geochemistry, *Subduction, *Orogenic belts, *Subduction zones |
| Abstract: | New data are reported on the age, composition, and formation conditions of the Late Triassic granitoids of minor intrusions from the eastern part of the Bureya continental massif of the Central Asian fold belt, and their geodynamic interpretation is given. U–Pb geochronological zircon studies indicate that the rocks of the Altakhta syenite–leucogranite complex were formed in two phases within 235–224 Ma. The first phase (235.3 ± 2.9–230 Ma) was responsible for the formation of magmatic rocks that are similar to the А1-type intraplate granitoids in terms of geochemistry and resemble subduction- and collision- related granitoids in terms of REE composition. The second phase (226–224 Ma) produced granites similar to А2-type and А2 + I and S-types. A combination of within-plate and subduction signatures and the presence of A, I, and S-type rocks of similar ages in this complex supports their formation in a transform continental margin setting. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
|
Full text is not displayed to guests.
Login for full access.
|
|
| Abstract: | New data are reported on the age, composition, and formation conditions of the Late Triassic granitoids of minor intrusions from the eastern part of the Bureya continental massif of the Central Asian fold belt, and their geodynamic interpretation is given. U–Pb geochronological zircon studies indicate that the rocks of the Altakhta syenite–leucogranite complex were formed in two phases within 235–224 Ma. The first phase (235.3 ± 2.9–230 Ma) was responsible for the formation of magmatic rocks that are similar to the А1-type intraplate granitoids in terms of geochemistry and resemble subduction- and collision- related granitoids in terms of REE composition. The second phase (226–224 Ma) produced granites similar to А2-type and А2 + I and S-types. A combination of within-plate and subduction signatures and the presence of A, I, and S-type rocks of similar ages in this complex supports their formation in a transform continental margin setting. [ABSTRACT FROM AUTHOR] |
|---|---|
| ISSN: | 18197140 |
| DOI: | 10.1134/S1819714021040059 |
