Miocene stratigraphy and spore-pollen complexes of the Tyulgan brown coal mine (Southern Urals)
The results of the palynological investigations of the Miocene sediments of the Tyulgan brown coal mine are summarized and discussed in this paper. Seven pollen complexes have been established according to the pollen analysis of the Tyulgan, Kuyurgaza, and Voroshilovka horizons (Cis-Uralian Superhor...
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| Format: | Article |
| Language: | English |
| Published: |
Kazan Federal University
2017-12-01
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| Series: | Учёные записки Казанского университета: Серия Естественные науки |
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| Online Access: | https://kpfu.ru/miocene-stratigraphy-and-spore-pollen-complexes_329267.html |
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| Summary: | The results of the palynological investigations of the Miocene sediments of the Tyulgan brown coal mine are summarized and discussed in this paper. Seven pollen complexes have been established according to the pollen analysis of the Tyulgan, Kuyurgaza, and Voroshilovka horizons (Cis-Uralian Superhorizon, Lower-Middle Miocene). The less informative pollen complexes have been discovered from the deposits of the Ushkatly horizon (Middle-Upper Miocene). Six sections of the Tyulgan brown coal mine have been stratified and correlated on the basis of the palynological data. New data on the vegetation evolution, main sources of coal, sedimentation, and climate changes of the Southern Urals during the Miocene have been obtained. It has been revealed that the Tyulgan time was characterized by the warmest (subtropical) climate when Taxodiaceae forests developed. During the Kuyurgaza time, the climate changed from cool to warm and back to cool at the end. The Voroshilovka time is characterized by warm climate conditions. In summary, vegetation of the studied area during the Miocene changed in the following way: 1) coniferous-broadleaved forest with significant participation of the subtropical elements; 2) mixed broadleaved forests, 3) coniferous forests with admixture of small- and broadleaved trees, 4) small-leaved forests and mixed small- and broadleaved forests with admixture of the subtropical elements. Two types of sediment accumulation conditions have been established – low swamps developed during the Tyulgan and Kuyurgaza time and transitional swamps that existed during the Voroshilovka time. According to the palynological analysis, Taxodiaceae, Nyssa sp., Alnus sp., Sphagnum sp., and Polypodiaceae were the main coal-forming plants. |
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| ISSN: | 2542-064X 2500-218X |