Distribution of rare elements at different evolutionary stages of Riphean and Phanerozoic tholeiite-basalt melts in the eastern part of the Siberian platform
https://doi.org/10.31242/2618-9712-2021-26-1-2
Abstract
Basite magmatism has been manifested repeatedly for a long time in various geodynamic structures within the eastern part of the Siberian platform. In the Late Precambrian and Middle Paleozoic, it was related to rifting processes, and in the Late Paleozoic-Early Mesozoic – to the initiation and development of trap syneclises. Differences of the geodynamic regime of magma formation are displayed in the material composition of rocks. This article presents a generalizing study of the petro-geochemical features of the tholeiitic basaltic melts formed in different geodynamic settings. The composition of initial magmas changes significantly at different stages of the development of magmatic system. Using multicomponent analysis, we reviewed the influence of fractionation processes of the basal melt, which occurred under various PT conditions, on its chemical composition. A significant change of the composition occurs during the intra-chamber differentiation of the melt in a sequence of rock strata varied from the basic magnesian to felsic alkaline rocks. In the resulting series of rocks, the content of rare elements included in the lattice of the early femic phases decreases, as well as the accumulation of almost all incompatible elements. The evolution of melts of normal alkalinity occurs with an increase in REE content and their insignificant separation. Intrusions that have undergone the stage of high-pressure fractionation in the deep transitional chamber are of particular importance. As a result of such differentiation, a peculiar group of rocks is formed in the cross section of bodies, such as monzonite-porphyries in one case and anorthosite gabbrodolerites in the other. It is established that the monzoitoid type of differentiation is characterized by accumulation of LREE, LITE and the elements of zirconium group Nb, Ta, Hf and Y. Isolation of anorthosite gabbro-dolerites in the cross-section of bodies, as well as an increase in the content of aluminum, calcium, and strontium in them, is an indication of the anorthositic tendency of magmatic melt differentiation.
Keywords
Supporting agencies: The study was carried out according to the plan of research and development work of the Diamond and Precious Metal Geology Institute SB RAS (Project 0381-2019-0003) and was financially supported by the RFBR under Project No. 18-45-140043 p_a.
About the Author
A. G. Kopylova
Diamond and Precious Metal Geology Institute SB RAS
Russian Federation
Russian Federation
KOPYLOVA Albina Georgievna, Researcher
39 Lenina pr., Yakutsk 677980
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For citations:
Kopylova A.G. Distribution of rare elements at different evolutionary stages of Riphean and Phanerozoic tholeiite-basalt melts in the eastern part of the Siberian platform. Arctic and Subarctic Natural Resources. 2021;26(1):17-31. (In Russ.) https://doi.org/10.31242/2618-9712-2021-26-1-2
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