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Sedimentology of the distal fan and lake deposits of the Tianshui- Qinan Basin (Central China): evidences against a possible eolian origin

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Alonso-Zarza, Ana María and Li, J. and Zhao, Z. and Song, C. H. and Zhang, J. and Wang, X. and Zhang, Y. (2006) Sedimentology of the distal fan and lake deposits of the Tianshui- Qinan Basin (Central China): evidences against a possible eolian origin. Geotemas, 9 . pp. 21-24. ISSN 1576-5172

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Abstract

In this paper we analyze two sections within the Tianshui-Qinan Basin, a closed basin in Central China. The deposits are Miocene and Pliocene in age and in recent times they have been considered as loess. The preliminary sedimentological study indicates a closed lacustrine basin, with a very flat topography in the inner parts. Periodical desiccation and subaerial exposure periods of both mudflats and shallow lakes caused important reworking of the sediments. The lake margins were ramp-like with different energy levels. Low energy lake margins are represented by marls, intraclastic and palus- trine limestones, whereas higher energetic levels are indicated by rippled sands and silts.


Item Type:Article
Uncontrolled Keywords:Tertiary, Central China, Tianshui-Qinan Basin, Alluvial fan, Lake deposits, Calcretes
Subjects:Sciences > Geology > Petrology
ID Code:60403
Deposited On:07 May 2020 11:04
Last Modified:12 May 2020 11:54

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