Geochronological analysis reveals new insights into syenite and gabbroid compositions in the Bystrinskii massif, suggesting a formation mechanism influenced by deep-seated fluids.
Numerous massifs of so-called syenites and gabbroids were known long ago among the metamorphic rocks of the Slyudyanskian series in the southwestern Baikalian region. Till now, however, no geochronological study of syenite massifs has been carried out in spite of their wide Occurrence in the region. Within the Bystrinskii massif investigated there are autochtone and allochtone (veined) fades clearly recognized, which are represented by charnockitoids, syenites, quartz syenites, leucogranites, alkaline granitoids, monzonites. In petrogeochemical aspect most of these rocks are distinguished for anomalously high concentrations of TiO2, A12O3, P2O5, Zr, La, Ce, Y, Ba, Sr, and low concentrations of Pb and Rb as compared with the clarke values, which evidences their formation by the same mechanism under effect of deep-seated (mantie) fluids.
No takes yet. Share an insight, caveat, or question.
Levitskii et al. (1991) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: