New Isotope Constraints on the Time of Formation of the Nersa Dolerite Complex from the Biryusa–Sayan Area
Autor: | E. F. Letnikova, E. A. Vasyukova, Dmitry V. Metelkin, F. A. Letnikov |
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Rok vydání: | 2019 |
Předmět: |
010504 meteorology & atmospheric sciences
Isotope Geochemistry 010502 geochemistry & geophysics 01 natural sciences Mantle (geology) Isotopic composition Petrography Earth and Planetary Sciences (miscellaneous) General Earth and Planetary Sciences Sedimentary rock Metasomatism Geology 0105 earth and related environmental sciences Zircon |
Zdroj: | Doklady Earth Sciences. 485:363-367 |
ISSN: | 1531-8354 1028-334X |
DOI: | 10.1134/s1028334x19040172 |
Popis: | New data on the Sm–Nd isotopic composition of the dolerites of the Nersa complex that are consistent with the petrographic study and the U–Pb dating of detrital zircon from the overlying sedimentary sequences of the Biryusa–Sayan area are presented. The data obtained indicate the absence of the supposed magmatic event 1.6 billion years ago and clearly indicate the Neoproterozoic age of the intrusions. Their source could have been the metasomatized mantle; dolerites went through several stages of metasomatism during their formation, which was reflected in the evolution of its isotopic systems. |
Databáze: | OpenAIRE |
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