干旱区生态环境知识资源中心(Arid): Climatically driven late Pleistocene - Holocene hydrological system transformation and landscape evolution in the eastern periphery of Chuya basin, SE Altai, Russia

Arid

DOI	10.1016/j.quaint.2020.01.013
	Climatically driven late Pleistocene - Holocene hydrological system transformation and landscape evolution in the eastern periphery of Chuya basin, SE Altai, Russia
	Nepop, R. K.; Agatova, A. R.; Uspenskaya, O. N.
通讯作者	Nepop, RK (corresponding author), Sobolev Inst Geol & Mineral, Novosibirsk, Russia.
会议名称	Workshop on Palaeohydrological Extreme Events - Evidence and Archives (EX-AQUA)
会议日期	SEP 26-OCT 01, 2016
会议地点	Padova, ITALY
英文摘要	This paper presents the results of geological, geomorphological, geochronological investigations and the analysis of the biological composition of deposits within the high-mountainous Boguty river basin. The main stages of landscape evolution during the last 14 ka have been investigated through 32 radiocarbon dates. The area is located in the most arid southeastern part of Russian Altai and constitutes the eastern periphery of the Chuya intermountain depression, and the western side of the Chikhachev range. Postglacial landscape development of the upper reaches of the Chuya River began from the degradation of its vast glaciation. By 14 ka cal BP the glaciers had either completely melted or retreated above 2500 m above sea level. As a result, numerous lakes occupied open places and five types of these basins can be seen in the modern topography. They are large moraine-dammed lakes connected with the Boguty River, while some basins have been dammed by uplifted tectonic blocks and numerous lakes are of thermokarst origin or are small cirque lakes and temporal lakes fed by seasonal meltwater from meteoric, ground water and permafrost degradation. Large moraine-dammed lakes within the Boguty basin were developed before the Holocene. The water filling these basins was controlled by the height of moraine dams and by the depth of the Boguty river incision. The moraine-dammed Low Boguty Lake formed earlier than 10 ka cal BP. Its partial draining and transformation of littoral zone into peat bog took place about 8.2-7.6 ka cal BP. As a result of the analysis of biological composition, four stages of water level fluctuations in the lacustrine-boggy system were recognized. The specific geomorphic and sedimentary features in the middle part of the Boguty basin determined the recurrence of debris flow events at about 8-7; 2.9-1; 0.65 and 0.3 ka cal BP, but the last event occurred in June 2017. The occurrence of fossil forest soils dating to about 11-8.5 ka cal BP and of charcoals (Larix sibirica Ledeb) of about 8.5-7.8 ka cal BP indicate a prolonged period of developing forest vegetation in the Boguty basin, which is currently treeless. In general, the data suggest that in SE Altai the climate in the first half of the Holocene was warmer and more humid in comparison with the modern one. The second half of the Holocene has been characterized by colder climate conditions accompanied by aridity intensification, which became especially pronounced during the last 2-1.5 ka.
英文关键词	Hydrological system transformation Landscape evolution Paleoenvironmental changes Late Pleistocene Holocene Russian Altai
来源出版物	QUATERNARY INTERNATIONAL
ISSN	1040-6182
EISSN	1873-4553
出版年	2020
卷号	538
页码	63-79
出版者	PERGAMON-ELSEVIER SCIENCE LTD
类型	Article; Proceedings Paper
语种	英语
收录类别	CPCI-S
WOS记录号	WOS:000535803200003
WOS关键词	GLACIER FLUCTUATIONS ; SOUTHEASTERN ALTAI ; OUTBURST FLOODS ; CLIMATE CHANGES ; MOUNTAINS ; RECORD ; TUVA ; GLACIATIONS ; DYNAMICS ; HISTORY
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
资源类型	会议论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/337015
作者单位	[Nepop, R. K.; Agatova, A. R.] Sobolev Inst Geol & Mineral, Novosibirsk, Russia; [Nepop, R. K.; Agatova, A. R.] Ural Fed Univ, Ekaterinburg, Russia; [Uspenskaya, O. N.] All Russian Res Inst Vegetable Growing, Vereya 500, Moscow Region, Russia
推荐引用方式 GB/T 7714	Nepop, R. K.,Agatova, A. R.,Uspenskaya, O. N.. Climatically driven late Pleistocene - Holocene hydrological system transformation and landscape evolution in the eastern periphery of Chuya basin, SE Altai, Russia[C]:PERGAMON-ELSEVIER SCIENCE LTD,2020:63-79.