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001			665912
005			20231030042019.0
035			_a(RuTPU)RU\TPU\network\37116
035			_aRU\TPU\network\22637
090			_a665912
100			_a20211123a2021 k y0engy50 ba
101	0		_aeng
102			_aDE
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181		0	_ai
182		0	_ab
200	1		_aPalaeo-environmental evolution of Central Asia during the Cenozoic: new insights from the continental sedimentary archive of the Valley of Lakes (Mongolia) _fA. Baldermann, O. Wasser, E. Abdullayev [et al.]
203			_aText _celectronic
300			_aTitle screen
320			_a[References: 84 tit.]
330			_aThe Valley of Lakes basin (Mongolia) contains a unique continental sedimentary archive, suitable for constraining the influence of tectonics and climate change on the aridification of Central Asia in the Cenozoic. We identify the sedimentary provenance, the (post)depositional environment and the palaeo-climate based on sedimentological, petrographical, mineralogical, and (isotope) geochemical signatures recorded in authigenic and detrital silicates as well as soil carbonates in a sedimentary succession spanning from ~34 to 21 Ma. The depositional setting was characterized by an ephemeral braided river system draining prograding alluvial fans, with episodes of lake, playa or open-steppe sedimentation. Metamorphics from the northern adjacent Neoarchean to late Proterozoic hinterlands provided a continuous influx of silicate detritus to the basin, as indicated by K-Ar ages of detrital muscovite (~798-728 Ma) and discrimination function analysis. The authigenic clay fraction is dominated by illite-smectite and “hairy” illite (K-Ar ages of ~34-25 Ma), which formed during coupled petrogenesis and precipitation from hydrothermal fluids originating from major basalt flow events (~32-29 and ~29-25 Ma).
330			_aChanges in hydroclimate are recorded in [delta]18O and [delta]13C profiles of soil carbonates and in silicate mineral weathering patterns, indicating that comparatively humid to semi-arid conditions prevailed in the late(st) Eocene, changing into arid conditions in the Oligocene and back to humid to semi-arid conditions in the early Miocene. Aridification steps are indicated at ~34-33, ~31, ~28 and ~23 Ma and coincide with some episodes of high-latitude ice-sheet expansion inferred from marine deep-sea sedimentary records. This suggests that long-term variations in the ocean-atmosphere circulation patterns due to pCO2 fall, reconfiguration of ocean gateways and ice-sheet expansion in Antarctica could have impacted the hydroclimate and weathering regime in the basin. We conclude that the aridification in Central Asia was triggered by reduced moisture influx by westerly winds driven by Cenozoic climate forcing and the exhumation of the Tian Shan and Altai Mountains and modulated by global climate events.
461			_tClimate of the Past
463			_tVol. 17, iss. 5 _v[P. 1955-1972] _d2021
610	1		_aэлектронный ресурс
610	1		_aтруды учёных ТПУ
610	1		_aкайнозой
610	1		_aозера
610	1		_aосадочные породы
610	1		_aконтинентальные отложения
610	1		_aиллиты
610	1		_aсмектиты
610	1		_aосадконакопление
610	1		_aтектоника
610	1		_aклимат
701		1	_aBaldermann _bA. _gAndre
701		1	_aWasser _bO. _gOliver
701		1	_aAbdullayev _bE. _gElshan
701		1	_aBernasconi _bS. _gStefano
701		1	_aLohr _bS. _gStefan
701		1	_aWemmer _bK. _gKlaus
701		1	_aPiller _bW. E. _gWerner
701		1	_aRudmin _bM. A. _cgeologist _cEngineer-researcher of Tomsk Polytechnic University _f1989- _gMaksim Andreevich _2stltpush _3(RuTPU)RU\TPU\pers\33254
701		1	_aRichoz _bS. _gSylvain
712	0	2	_aНациональный исследовательский Томский политехнический университет _bИнженерная школа природных ресурсов _bОтделение геологии _h8083 _2stltpush _3(RuTPU)RU\TPU\col\23542
801		2	_aRU _b63413507 _c20211209 _gRCR
856	4		_uhttp://earchive.tpu.ru/handle/11683/69114
856	4		_uhttps://doi.org/10.5194/cp-17-1955-2021
942			_cCF