A geochemical and lithological correlation of lower Jurassic conglomerates in the area surrounding the Lake Baikal rift zone: an improved reconstruction of the region’s palaeogeographic and tectonic evolution

Akulov, Nikolay; Mel’nikov, A. I.; Shtel’makh, S. I.; Akulova, V.V.; Hearn, P.P.

doi:10.1080/00206814.2020.1836683

Cited by 2 publications

(3 citation statements)

References 11 publications

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“…Despite the large number of publications devoted to studies of the Irkutsk coal-bearing basin [3][4][5][7][8][9][10][11], there are too few modern analytical data for this area. In recent years, the study of the Irkutsk coal-bearing basin was focused on stratigraphy, structural evolution, and sedimentology [5,[11][12][13][14][15][16]. Geochemical data were only obtained for coals of the Azeisk coal deposit [17] and the uppermost Prisayan Fm.…”

Section: Introductionmentioning

confidence: 99%

“…years, the study of the Irkutsk coal-bearing basin was focused on stratigraphy, structural evolution, and sedimentology [5,[11][12][13][14][15][16]. Geochemical data were only obtained for coals of the Azeisk coal deposit [17] and the uppermost Prisayan Fm.…”

Section: Introductionmentioning

confidence: 99%

“…and Kuda Fm. [11,12,18]. On the global scale, the Toarcian is marked by an ocean anoxic event (Toarcian-OAE) [19], which in turn likely resulted from Karoo-Ferrar flood basalt volcanism [20,21].…”

Section: Introductionmentioning

confidence: 99%

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Geochemistry of the Cheremkhovo and Lower Prisayan Formations from the Jurassic Irkutsk Coal-Bearing Basin: Evidence for Provenance and Climate Change in Pliensbachian–Toarcian

2021

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The Cheremkhovo formation (Pliensbachian) is the primary coal-bearing formation of the Irkutsk basin, Eastern Siberia. Still, few geochemical studies of the Jurassic sediments of the Irkutsk coal-bearing basin have been conducted, and there are no data on the geochemistry of the coal-bearing formation itself. This study presents geochemical data for 68 samples from the Cheremkhovo formation and the overlying Lower Prisayan formation. The age of the former has been estimated by U-Pb dating of zircon from a tonstein (altered volcanic ash) layer as Pliensbachian, whereas the age of the latter is estimated as Pliensbachian–Toarcian according to regional stratigraphy. Major oxide and trace element concentrations were obtained using X-ray fluorescence spectrometry. Geochemical indicators showed diversity between the two studied formations. The indicators used show the change in climate conditions, from warm and humid in the Cheremkhovo formation, to hot and arid during the deposition of the lower Prisayan formation. The provenance of the Irkutsk coal-bearing basin was mainly influenced by the source composition, not recycling, and sediments were mainly derived from felsic to intermediate igneous rocks with a mixture of other rock types.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geochemistry of the Cheremkhovo and Lower Prisayan Formations from the Jurassic Irkutsk Coal-Bearing Basin: Evidence for Provenance and Climate Change in Pliensbachian–Toarcian

2021

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Exposure of Carboniferous Granitoids on Triassic–Jurassic Seashores in the Western Caucasus: A Stratigraphical Review

Ruban

2024

JMSE

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Granitoids are known to crop out on ancient seashores, but the related geological evidence remains limited. The information from the Western Caucasus sheds light on the stratigraphical distribution of coarse siliciclastic beds associated with late Carboniferous granitoids of the Dakh, Rafabgo, and Sakhray crystalline massifs. For the purposes of this study, the available information was reviewed and verified against the modern stratigraphical scales. It is established that the considered coarse sisliciclastic beds occur at five stratigraphical levels of the Triassic–Jurassic succession. A rocky seashore with granitoid exposures existed for a short time around the Sakhray and probably Rufabgo massifs at the very beginning of the Triassic. The Dakh Massif possessed such a shore twice (at least), i.e., in the Norian–Rhaetian and the Early Toarcian. However, it cannot be excluded that rocky shores persisted there for >50 Ma. Generally, the Western Caucasus provides an example of granitoid exposures on Mesozoic seashores and adds knowledge of the global distribution of rocky shores in the Triassic and Jurassic periods.

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A geochemical and lithological correlation of lower Jurassic conglomerates in the area surrounding the Lake Baikal rift zone: an improved reconstruction of the region’s palaeogeographic and tectonic evolution

Cited by 2 publications

References 11 publications

Geochemistry of the Cheremkhovo and Lower Prisayan Formations from the Jurassic Irkutsk Coal-Bearing Basin: Evidence for Provenance and Climate Change in Pliensbachian–Toarcian

Geochemistry of the Cheremkhovo and Lower Prisayan Formations from the Jurassic Irkutsk Coal-Bearing Basin: Evidence for Provenance and Climate Change in Pliensbachian–Toarcian

Exposure of Carboniferous Granitoids on Triassic–Jurassic Seashores in the Western Caucasus: A Stratigraphical Review

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