Petrographic description and age of Aldan-Anabar block rocks of the Siberian Platform basement according to deep well logs
https://doi.org/10.52349/0869-7892_2022_92_28-40
Abstract
Results of studying the petrographic and chemical composition and determining the absolute age of basement rocks of the central Siberian Platform are described. Chemically, the analyzed rocks belong to the acid and medium rocks of the normal and moderately alkaline series of the pluton class. The REE distribution spectra, normalized to chondrite, are characterized by the predominance of light elements over heavy ones; at the level of heavy elements, the graph gradually flattens out. The obtained age datings of the rocks characterize four independent stages of the basement formation – 3,16–3,17; 2,83; 2,71–2,72 and 1,90 Ga, which corresponds to the range from the Lower Lopian Erathem (LP1) of the Upper Archean (AR2) to the Upper Karelian (KR2) of the Lower Proterozoic (PR1).
About the Authors
A. I. Larichev
A. P. Karpinsky Russian Geological Research Institute (VSEGEI)
Russian Federation
Russian Federation
Larichev Andrey Ivanovich – Candidate of Geological and Mineralogical Sciences, Deputy General Director
74 Sredny Prospect, St. Petersburg, 199106
S. V. Vidik
A. P. Karpinsky Russian Geological Research Institute (VSEGEI)
Russian Federation
Russian Federation
Vidik Svetlana Vladimirovna – Candidate of Geological and Mineralogical Sciences, Head of the laboratory
74 Sredny Prospect, St. Petersburg, 199106
S. A. Sergeev
A. P. Karpinsky Russian Geological Research Institute (VSEGEI)
Russian Federation
Russian Federation
Sergeev Sergey Andreevich – Candidate of Geological and Mineralogical Sciences, Director, CIR
74 Sredny Prospect, St. Petersburg, 199106
I. V. Osadchiy
A. P. Karpinsky Russian Geological Research Institute (VSEGEI)
Russian Federation
Russian Federation
Osadchiy Il’ya Vladimirovich – Head of Department
74 Sredny Prospect, St. Petersburg, 199106
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Review
For citations:
Larichev A.I., Vidik S.V., Sergeev S.A., Osadchiy I.V. Petrographic description and age of Aldan-Anabar block rocks of the Siberian Platform basement according to deep well logs. Regional Geology and Metallogeny. 2022;(92):28-40. (In Russ.) https://doi.org/10.52349/0869-7892_2022_92_28-40
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