Abstract
Results of isotope Sr, Ns, and O analyses of volcanic rocks from the Uda sector of the West Transbaikal Rift Zone have allowed estimation of the character of interaction of their parental mantle melts with crustal rocks. The smallest magnitude of this interaction has been found in the compositions of Late Cretaceous (83–70 Ma) volcanics, the geochemical and isotope markers of which suggest their derivation from a moderately enriched mantle compositionally resembling OIB sources. The Early Cretaceous volcanics were derived from mantle sources that included a mantle enriched by subduction. While ascending through the crust, the parental melts of the Uda Complex (130–111 Ma) were contaminated by the lower crust matter. The Zazin Complex magmas (143–135 Ma) have features suggesting their interaction with upper crustal granitoids of the Angara–Vitim Batholith.
Similar content being viewed by others
References
V. V. Yarmolyuk and V. G. Ivanov, Geotectonics 34 (2), 121–140 (2000).
V. V. Yarmolyuk, V. G. Ivanov, and V. I. Kovalenko, Petrology 6 (2), 101–123 (1998).
A. A. Vorontsov, V. V. Yarmolyuk, and T. Yu. Komaritsyna, Russ. Geol. Geophys. 57 (5), 723–744 (2016).
State Geological Map of the Russian Federation 1: 1000000, Sheets No. N-49 (Karpinsky Russ. Geol. Res. Inst., St. Petersburg, 2011).
A. Zindler and S. Hart, Annu. Rev. Earth Planet. Sci. 14, 493–571 (1986).
A. A. Tsygankov, Russ. Geol. Geophys. 55 (2), 153–176 (2014).
V. V. Yarmolyuk and V. I. Kovalenko, Geol. Geofiz. 44 (12), 1260–1274 (2003).
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © T.Yu. Komaritsyna, V.V. Yarmolyuk, A.A. Vorontsov, 2018, published in Doklady Akademii Nauk, 2018, Vol. 481, No. 3.
Rights and permissions
About this article
Cite this article
Komaritsyna, T.Y., Yarmolyuk, V.V. & Vorontsov, A.A. Crustal Contamination of Early Cretaceous Magmatic Rocks of the Western Transbaikal Rifting Zone. Dokl. Earth Sc. 481, 948–952 (2018). https://doi.org/10.1134/S1028334X18070231
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1028334X18070231