РЕЗУЛЬТАТЫ КОМПЛЕКСНОГО ИССЛЕДОВАНИЯ ДВУХ ГОЛОЦЕНОВЫХ ТОРФЯНИКОВ ТОБОЛЬСКО-ПРИИРТЫШСКОГО ЛИТОФАЦИАЛЬНОГО РАЙОНА

• Main Authors: Ахтерякова, Анастасия, Лещинский, Сергей
• Format: Text
• Language: unknown
• Published: Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Национальный исследовательский Томский государственный университет" 2014
• Subjects: ЗАПАДНО-СИБИРСКАЯ РАВНИНА,ТОБОЛЬСКИЙ "МАТЕРИК",ГОЛОЦЕН,ТОРФЯНИКИ,ПАЛИНОЛОГИЧЕСКИЙ И РАДИОУГЛЕРОДНЫЙ АНАЛИЗЫ,WEST-SIBERIAN PLAIN,TOBOLSK "MAINLAND",HOLOCENE,PEAT,PALYNOLOGICAL ANALYSIS,ASH CONTENT,RADIOCARBON ANALYSIS; Torfyanoy; Yar; Yenisey; taiga; Siberia
• Online Access: http://cyberleninka.ru/article/n/rezultaty-kompleksnogo-issledovaniya-dvuh-golotsenovyh-torfyanikov-tobolsko-priirtyshskogo-litofatsialnogo-rayona; http://cyberleninka.ru/article_covers/15617518.png

Представлены результаты стратиграфического, палинологического и радиоуглеродного анализов голоценовых торфяников разрезов Горный Денщик (р. Иртыш) и Торфяной Яр (р. Демьянка). Рассматриваемые торфяники локализованы в пределах Тобольско-Прииртышского литофациального района, но сформированы на различных геоморфологических уровнях. Это позволяет оценить особенности формирования спорово-пыльцевых спектров в озерно-болотных отложениях, приуроченных к разным структурным элементам, и точнее охарактеризовать палеогеографическую обстановку времени осадконакоп-ления. Результаты исследований показали, что состав спорово-пыльцевых спектров напрямую зависит от геологических условий осадконакопления, а также от рельефа местности. The paper considers the results of a comprehensive research of two Holocene peatlands: Gorniy Denshchik and Torfyanoy Yar. The sections under study are located in the eastern part of the Tobolsk-Irtysh lithofacies area and confined spatially to the geobotanical subzone of the middle taiga. Peatlands are formed in the conditions of the same climatic zone but at different geomorphological levels. This gives the reason for differences in the composition of the established palynological complexes which are connected with the sedimentation specificity. The comparison between the data of palynological and radiocarbon analyses of samples from Torfyanoy Yar and Gorniy Denshchik yielded the following results. In the investigated sections, the common paludification seems to be proceeding concurrently, though the beginning of the mass peat accumulation does not contemporize. The beginning of the peat lens formation in Gorniy Denshchik (~9 ka.) seems to contemporize with the period of accumulation of clayey deposits of the flood-plain facies of Torfyanoy Yar. Similar conditions of the peat deposits formation appeared only since the Atlantic optimum (~7-5 ka.), when the accumulation on the both sites proceeded in the oligotrophic conditions. The investigation results obtained by the present authors correlate with data on the analogous objects of the considered region, thus suggesting the beginning of the common paludifi-cation of the central part of the West Siberian plain approximately since 10.3-9 ka. The main available information on the mass peat accumulation in the central part of Western Siberia has been gathered in studying the river valley complexes. The investigation of such sections prevents from the complete characterization of paleogeographical conditions of sedimentation due to the stable admixture of the redeposited paleontological material. As a consequence, the most representative are the data obtained from the high peat bogs outside the terrace complexes. It is the authors'' opinion that one such section is the peatland in Gorniy Denshchik which may become the key one for the Holocene of the Tobolsk-Irtysh lithofacies area. Results of investigating the large bog massifs in the Ob -Irtysh an Ob Yenisey interfluves demonstrate a similar dynamics of the development of the Holocene environment for the central part of the region.