Abstract
Gabbroid intrusions within the Vitim alkaline province (some 100 km east of Lake Baikal, Russia) are scarce and occur as rather small bodies. History of their formation and evolution, as well as their link with alkaline and acidic magmatism, are not fully understood. To shed light on these research issues, geochronological, mineralogical, petro-geochemical, and isotopic (Sr, Nd, Pb, O) studies of scapolite, scapolite-bearing, and garnet-bearing gabbro of the Bambuy intrusion were carried out. It was deduced for the first time that there are two types of scapolite in the rocks. The first type appears to be a sodium meionite enriched in SO3, Cl, and CO2, which likely originated during the magmatic stage. The second type, on the other hand, is scapolite of meionite composition (rich in CO2) and occurs in the contact zone of the Bambuy intrusion and its host rocks. U–Pb isotopic dating of zircons from gabbro limits the age of the intrusion to 270 ± 1 Ma. The Bambuy intrusion formed later in time than the alkaline and acidic rocks (315–280 Ma) in this region. Gabbroids are characterized by: enrichment in large-ionic lithophilic elements (LILE) and negative Ta-Nb and Ti anomalies on the primitive mantle-normalized spectra, negative values of eNd (t) (ranging from −9.17 to −9.33), isotope-heavy values of δ18 O v-SMOW (+7.0… +11.6%), and Sr (I) of 0.70754–0.70756. All these geochemical characteristics imply that the Bambuy rocks originated from sources of lithospheric mantle modified by subducted material. Subsequently, the basic melt interacted with sedimentary carbonate strata which led to the formation of scapolite in the gabbro.
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Acknowledgements
The research on the geological structure and mineralogy of the rocks of the Bambuy complex was carried out with the financial support of the GIN SB RAS (AAAA-A21-121011390002-2) and IGM SB RAS (FWZN-2022-0024), geochronological and geochemical studies of the rocks were carried out with the financial support of the Russian Science Foundation (RSF), project 22-17-00078. We are grateful to E.A. Khromova (EMPA analysis), O.V. Zarubina (ICP-MS analysis) for their outstanding analytical work. We would like to thank Magdalena Dumańska-Słowik and an anonymous reviewer for constructive criticism of the first version of the manuscript. Their comments and suggestions were very helpful and improved the quality of the article significantly. Oles Savchuk is thanked for help with the English language. The editorial work of Prof. Wolf-Christian Dullo is also highly acknowledged.
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Izbrodin, I., Doroshkevich, A., Rampilov, M. et al. Age and petrogenesis of scapolite gabbro from the Bambuy intrusion (Vitim plateau, Russia) and their tectonic significance. Int J Earth Sci (Geol Rundsch) 111, 1859–1883 (2022). https://doi.org/10.1007/s00531-022-02202-4
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DOI: https://doi.org/10.1007/s00531-022-02202-4