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Late cretaceous granitoids of the Mainitsky terren (Eastern Koryak Highlands): age, geochemical features and geodynamics
- Authors: Moiseev A.V.1, Luchitskaya M.V.1, Palechek T.N.1, Sokolov S.D.1, Razumnyj A.V.2, Aksenov S.V.2, Mal’ceva A.V.2
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Affiliations:
- Geological institute, Russian Academy of Sciences
- A.P. Karpinsky Russian Geological Research Institute
- Issue: Vol 514, No 1 (2024)
- Pages: 97-104
- Section: PETROLOGY
- Submitted: 31.01.2025
- Published: 27.06.2024
- URL: https://rjmseer.com/2686-7397/article/view/650026
- DOI: https://doi.org/10.31857/S2686739724010119
- ID: 650026
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Fig. 1. Tectonic scheme of the Koryak highlands (according to [12]). 1 – Paleogene-Quaternary deposits; 2 – volcanogenic-siliceous- terrigenous deposits of the Middle Jurassic – Turonian; 3 – terrigenous deposits of Alba–date; 4 – ophiolites of the Late Paleozoic–Late Mesozoic; volcanogenic-siliceous- terrigenous and terrigenous deposits Middle Jurassic – Turonian; 5 – ophiolites of the Late Paleozoic – Early Mesozoic; terrigenous deposits of the Upper Jurassic – Paleo- Price; 6 – ophiolites of the Late Paleozoic – Early Jurassic; terrigenous deposits of the Upper Jurassic – Paleocene; 7 – terrigenous deposits of the Late Jurassic – Late Cretaceous; basalt- siliceous rocks of Oxford–Campana; 8 – terrigenous deposits of the Santonian–Paleocene; 9 – volcanites and Tufo-terrigenous deposits of the Upper Jurassic – Valangina. 10, 11 – Late Cretaceous igneous bodies outside the scale: 10 – volcanites; 11 – granitoids: a – stocks; b – dikes; 12 – thrusts, teeth in the direction of fall; 13 – shifts; 14 – stratigraphic disagreement; 15 – area of study. Terranes: West Kamchatka
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Fig. 2. Schemes of the geological structure of the districts of the Severnaya River (a), Lake Mainitz (b) of the Mainitsky terrane, according to [1, 3-5] with changes. 1 – Quaternary deposits; 2, 3 – terrigenous and volcanogenic-terrigenous deposits: 2 – Kellovey-Goteriv, Topol strata; 3 – Albaturon, Kuibiveyem series; 4 – stocks of plagiogranites and granodiorites; 5 – diorite porphyrites; 6 – dikes of granitoids; 7 – geological boundaries; 8 – faults; 9 – geochronological sampling sites and their numbers.
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Fig. 3. Concordia diagrams for zircon from Late Cretaceous granitoids of the Mainitsky terrane of the Koryak folded region. The age values are given in millions of years, the specified error and the size of the ellipses correspond to the value 2σ. The red ellipse shows the result excluded from the calculation.
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Fig. 4. Chondrite-normalized REE distributions (a) and spidergrams of rare elements normalized to the composition of the primitive mantle (b) of the granitoids of the Severnaya River and Lake. Mainitz, Koryakia. 1, 2 – granitoids: 1 – river Se- vernaya, 2 – lake. Mainitz; 3 – Cretaceous volcanites of acidic composition of OCHVP [14]; 4 – Albian volcanites of OCHVP [14]; 5 – the average composition of I-type granite [16].
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Fig. 5. Diagrams Rb–(Y+Nb) [20] (a), Fe2O3*–TiO2*10–MgO [18] (b), Th/Yb–Nb/Yb [19] (c) for granitoids of the Severnaya River and Lake. Mainitz, Koryakia. 1, 2 – granitoids: 1 – Severnaya River, 2 – Lake. Maynitz.
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Appendix 1
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Appendix 2
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