Abstract
This paper reports new data on the geology and stratigraphy of the Upper Jurassic–Lower Cretaceous deposits of the eastern part of the Oloy zone (upper reaches of the Oloy, Ilguveem, Aluchin rivers), including the description of sections, lithological-petrographic and paleontological characteristics of volcaniclastic sediments, the results of petrological-geochemical study of volcanic rocks, and their isotope dating. Two concordant dates were obtained using the zircon U–Pb method: 147 ± 2 Ma (Elom Formation) and 140 ± 2 Ma (Glukhovskaya Formation). The island-arc nature of the studied formations has been substantiated. The facies conditions and geodynamic settings of all stages of the formation of the volcanic-sedimentary complex in the various structural-facies zones have been characterized.
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ACKNOWLEDGMENTS
We are grateful to our colleagues, who participated in the field and laboratory works, processing and preparation of obtained material. We thank T.N. Surin for help and support during performance of works, consultations, and discussion of obtained results.
Funding
This work was supported by the 2019, 2021 government-financed program of VSEGEI in the framework of GPD-200 works in the Upper Oloy area, project no. 121031700312-1 SVKNII, and by the government-financed program of GIN RAS (project no. 0135-2019-0038). The final part of the work was partially supported by the Russian Science Foundation (project no. 20-17-00169).
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SUPPLEMENTARY 1.
SUPPLEMENTARY 1.
Description of sections of the stratified units of the Oloy Zone
Section numbers correspond to those presented in Figs. 2, 3. Faunal determinations were made by V.A. Zakharov (GIN RAS) (bivalves) and M.A. Alekseev (VSEGEI) (foraminiferas).
Section I, Ukon Sequence, Umkuveem SFZ
Watershed of the left tributaries (the Aist and Razdvoennyi creeks) of the Pravyi Ilguveem River:
1. Alternation of basalts, basaltic andesites, their tuffs (xenotuffs), and tuffites of the intermediate composition, >30 m
2. Psephitic andesite tuffs (xenotuffs) with interlayers of psammitic and silty tuffites with remains of bivalves Buchia concentrica (Sow.), B. ischeriana (d’Orb.), and tuffstones, 120 m
3. Psammitic and silty tuffites intercalated with andesites and tuffstones with remains of bivalve shells Buchia tenuistriata (Lah.), Isocyprina (Venericyprina?) birkelundi (Für.), 80 m
4. Alternation of tuffstones with buchia remains (20–40-m thick) with tuffites, tuffaceous siltstones (thickness up to 5 m), and lenses of tuffaceous gravelstones (10–20-m thick), scarce interlayers of andesites and their tuffs (20–40-m thick); Foraminiferas Trochammina cf. minutissima (Dain), T. cf. quinquelocularis (Dain), T. cf. kumaensis (Levina), Meandrospira sp., Sacammina sp. Geinizinita ex gr. nodulosa (Furss. et Polen.) were extracted from tuffaceous interlayers, over 200-m thick.
Thickness of section >430 m.
Section II – Ukon Sequence, Ilguveem SFZ
Middle reaches of the Keiettyne River, near the mouth of its left tributary of the Mylka Creek:
1. Andesite and basaltic andesite tuffs of psammitic dimension, locally finely psephitic lithic crystal tuffs, >40 m
2. Alternation of basalts, basaltic andesites, and andesites with the predominance of the latter, more rarely andesitic dacites with thin tuff interlayers, 80–100 m
3. Lithic crystal tuffs of psephitic dimension, 50–60 m
4. Alternation of andesite covers (predominant), andesitic dacites, amygdaloidal basalts and basaltic andesites with thin intercalations of basaltic tuffs; facies transitions are possible, over 150 m
Thickness of the section of more than 350 m.
Section III, Elom Sequence, Umkuveem SFZ
Right bank of the Klin Creek (left tributary of the Ilguveem River):
1. Alternation of andesite and rhyolite tuffs with thin intercalations of lavas of the same composition, >140 m;
2. Massive rhyolite and rhyodacite tuffs, 70 m;
3. Andesite tuff with intercalations of andesite and andesitic dacite lavas, 120 m;
4. Massive, pseudofluidal rhyolite tuffs, 60 m;
5. Alternation of tuffs and lavas of basalts, basaltic andesites, dacites, and rhyodacites, 110 m
6. Hematized basalts, amygdaloidal at the base, their tuffs and tuffites, intercalations of andesitic dacite tuffs, 10–40 m;
7. Massive rhyolite and rhyodacite tuffs, 60–100 m;
8. Alternation of tuffs and lavas of andesites, dacites, and andesitic dacites, >70 m.
Thickness of section, 710 m.
Section IV, Elom Sequence, Ilguveem SFZ
Upper reaches of the Keiettyne River, western slope of Mt. Mylka:
1. Dacite, rhyodacite, more rarely andesitic dacite tuffs with thin interlayers of aphyric dacites, >170 m
2. Rhyolite and rhyodacite tuffs, 90 m;
3. Alternation of dacites and their tuffs with thin andesite intercalations, 80 m;
4. Dacite tuffs and xenotuffs, 20 m
5. Locally amygdaloidal basalts, basaltic andesites, 50 m;
6. Alternation of tuffs and lavas of basalts and andesites, with thin tuffstone intercalation in the upper part, >60 m;
Section thickness >470 m.
Section VI, Otelochnaya Formation, lower part, Umkuveem SFZ
Watershed of the upper reaches of the Krylo and Klin creeks (left tributary of the Ilguveem River):
1. Fine and medium-pebbled conglomerates with gravelstone interlayers, >140 m;
2. Members of flyschoid intercalation of fine-grained sandstones and siltstones (thickness 10–40 m) separated by units of monotonous medium- and fine-grained volcanomictic sandstones and tuffstones with scarce shells Buchia unschensis (Pavl.), B. fischeriana (d’Orb.), thin intercalations of conglomerates and gravelstones, 240 m;
3. Alternation of fine-grained sandstones (tuffstones) and siltstones with a gradual increase of siltstone fraction, >130 m;
Section thickness >510 m.
Section VII, Otelochnaya Formation, upper part, Umkuveem SFZ
Rosomakha River Basin (left tributary of the Ilguveem River):
4. Calcareous sandstones, 20 m;
5. Volcanomictic sandstones with bivalve shells Buchia fischeriana (d’Orb.), B. russiensis (Pavl.), 50 m;
6. Finely pebbled conglomerates , 15 m;
7. Siltstones, 25 m;
8. Volcanomictic sandstones with scarce thin (up to 20 cm) interlayers of vitric psammitic rhyolite tuffs. Finds of bivalves Buchia ex gr. fischeriana (d’Orb.), B. sp. juv in sandstones, 200 m;
9. Alternation of volcanomictic sandstones, calcareous sandstones (thickness of 10–15 m), tuffstones, siltstones (1–3 m), 90 m;
Section thickness >400 m.
Section VIII, Pereval’ninskaya Formation, Umkuveem SFZ
Right bank of the Pravyi Ilguveem River:
1. Medium- and coarse-pebbled (tuffaceous conglomerates), bouldery conglomerates, with intercalations of tuffaceous gravelstones with coalified plant detritus, >50 m;
2. Volcanomictic sandstones with intercalations of tuffstones, tuffaceous siltstones, coaly mudstones, and tuffites of andesites, lenses and interlayers of coalified plant detritus; interlayer of carbonaceous mudstones yielded foraminiferas Kutsevella cf. difficilis (Kusina), Cribrostomoides cf. concavoides (Bulynn.), C. cf. romanovae (Bulynn.), Recurvoides cf. obskiensis (Rom.), Verneuilinoides cf. pseudo- minusculus (Bystr.), Ammodiscus continentalis (Schar.), Mjatliukajena ex gr. gaultina (Berth.), Pylammina aff. dainae (Bulynn), Meandrospira sp., 40 m;
3. Volcanomictic sandstones with intercalations (5–10 m) of calcareous sandstones and sandy coquina made up of fragments of shells Buchia ex gr. sublaevis (Keys.), 190 m;
4. Volcanomictic sandstones with scarce remains of bivalves Buchia inflata (Lah.), B. sp. ind., 60 m;
5. Andesite tuffs and tuffites, 40 m;
6. Volcanomictic sandstones and tuffstones with remains of bivalves and coalified plant detritus, intercalations of shell sediments with Buchia ex gr. sublaevis (Keys.), 60 m;
7. Andesite tuffs, 10 m;
8. Tuffstones with coquina intercalations, 70 m;
9. Volcanomictic sandstones with coquina intercalations containing Buchia ex gr. sublaevis (Keys.), 50 m;
Section thickness >570 m.
Section IX, Glukhovskaya Formation, Vukvaam SFZ
Left bank of the Sablya Creek (right tributary of the Aluchin River):
1. Psephitic–silty andesite and andesitic dacite tuffs, >150 m;
2. Alternation of andesite and andesitic dacite tuffs of psephitic–silty dimensions and thin-bedded tuffaceous siltstones, 40 m;
3. Andesitic dacite tuff of silty-psephitic dimensions, 60 m;
4. Alternation of dacite and rhyodacite tuffs of psephitic, silty dimension, >320 m;
The thickness of the recovered part of the section, 570 m.
Section X, Prozrachnenskaya Formation, lower part, Vukvaam SFZ
Right bank of the Sablya Creek (right tributary of the Aluchin River):
1. Alternation of coarse-grained volcanomictic sandstones, psammitic and ash dacite tuffs, >50 m;
2. Coarse-grained volcanomictic sandstones with siltstone intercalations and with scarce fragments of bivalve shells Buchia sp. ind. (ex gr. fischeriana), 25 m;
3. Alternation of coarse-grained volcanomictic sandstones, ash tuffs of dacites and rhyolites, 75 m;
4. Thin-bedded ash dacite tuffs, 30 m;
5. Alternation of psammitic tuffites and ash tuffs of dacites, coarse-grained volcanomictic sandstones, and tuffstones, 45 m;
6. Alternation of tuffites, psammitic–psephitic dacite tuffs; with scarce thin intercalations (up to 0.3 m) of organogenic limestones (coquina deposits) with shells of Buchia ex gr. unschensis (Pavl.); B. ex gr. fischeriana (d’Orb.), 50 m;
7. Psephitic–psammitic and psephitic andesitic dacite and andesite tuffs with intercalations of welded tuffs, coarse-grained sandstones, and tuffstones, 80 m;
8. Alternation of psammitic and psephitic–psammitic dacite tuffs, 55 m;
9. Psephitic rhyolite tuffs with thin (1–2 m) intercalations of psammitic tuffites and ash dacite tuffs, 35 m;
10. Psephitic–psammitic tuffs of dacites, andesitic dacites, and rhyolites with intercalations of welded tuffs, 85 m;
Section thickness is 530 m.
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Starikova, E.V., Gagieva, A.M., Konovalov, A.L. et al. Upper Jurassic–Lower Cretaceous Deposits of the Eastern Part of the Oloy Zone: Stratigraphy, Geochemistry, Age, and Geodynamic Setting. Russ. J. of Pac. Geol. 17, 297–321 (2023). https://doi.org/10.1134/S181971402304005X
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DOI: https://doi.org/10.1134/S181971402304005X