TY - JOUR

T1 - Turga Lagerstätte (Middendorf’s Outcrop, Eastern Transbaikalia, Barremian–Aptian): Stratigraphic Range and Palaeoenvironments

AU - Kosenko, I. N.

AU - Pestchevitskaya, E. B.

AU - Efremenko, V. D.

AU - Metelkin, E. K.

AU - Yan, P. A.

AU - Rodchenko, A. P.

AU - Nikitenko, B. L.

AU - Mirzabaev, D. A.

N1 - Administration, materials, macrofauna studies (fish, insects, conchostracans), geochemical studies of OM (TOC content determination, biomarker hydrocarbon analysis, TOC isotope analysis) were financially supported by the Russian Science Foundation grant No. 22-17-00228 (https://rscf.ru/ project/22-17-00228/) and physically based at the Trofimuk Institute of Petroleum Geology and Geophysics of the Siberian Branch of the Russian Academy of Sciences (IPGG SB RAS). The 2021 field studies were conducted under the state task (current project of the Ministry of Education and Science FWZZ-2022-0004) and supported by the IPGG SB RAS a grant for field studies of. Studies of microfauna and palynomorphs were funded by the Russian Science Foundation (RSF) grant No. 22-17-00054. During the studies the research team received scientific and methodological support from RSF (FWZZ-2022–0004, FWZZ-2022–0005, FWZZ-2022–0007, FWZZ-2022–0011). The authors wish to express their thanks to A.V. Legalov (IS&EJ) and B. Wang (NIGPAS) for their help in identifying insects, G. Li (NIGPAS) for help in identifying conchostracans, J. Sha and J. Cheng (NIGPAS) for help in choosing the literature on the Mesozoic stratigraphy of China, and P.P. Sku-chas (St. Petersburg State University) and an anonymous reviewer for reviewing the manuscript. Публикация для корректировки.

PY - 2023

Y1 - 2023

N2 - The age of the Turga Formation in the Middendorf’s outcrop is determined as latest Barremian–earliest Aptian based on fauna and microfossil assemblages. The composition of the fauna and palynomorph assemblages allows correlations between the Turga Formation and the Yixian Formation and lower part of the Jiufotang Formation of Northeast China. Results of the petrographic and geochemical analysis as well as microfossil studies showed that sediments accumulated in a shallow lake with low-energy hydrodynamics, sometimes under low-oxygen conditions. Climate features (warm temperate climate transitional to subtropical) and type of vegetation (coniferous forests with admixture of hardwoods) are reconstructed taking into consideration the composition of spore-pollen assemblages.

AB - The age of the Turga Formation in the Middendorf’s outcrop is determined as latest Barremian–earliest Aptian based on fauna and microfossil assemblages. The composition of the fauna and palynomorph assemblages allows correlations between the Turga Formation and the Yixian Formation and lower part of the Jiufotang Formation of Northeast China. Results of the petrographic and geochemical analysis as well as microfossil studies showed that sediments accumulated in a shallow lake with low-energy hydrodynamics, sometimes under low-oxygen conditions. Climate features (warm temperate climate transitional to subtropical) and type of vegetation (coniferous forests with admixture of hardwoods) are reconstructed taking into consideration the composition of spore-pollen assemblages.

KW - Aptian

KW - Barremian

KW - Jehol Biota

KW - Transbaikalia

KW - Turga Formation

KW - Turga biocenosis

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85176455567&origin=inward&txGid=13aa156d1aa47c0b8f753371e73e0ac4

UR - https://www.mendeley.com/catalogue/a24c356d-e1db-3f83-8d9f-bc08475825cc/

U2 - 10.2113/RGG20234625

DO - 10.2113/RGG20234625

M3 - Article

VL - 64

SP - 1358

EP - 1381

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 11

ER -