Alonso Zarza, Ana MaríaLi, J.Zhao, Z.Song, C. H.Zhang, J.Wang, X.Zhang, Y.2023-06-202023-06-2020061576-5172https://hdl.handle.net/20.500.14352/52438In 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.spajournal articlehttp://www.sociedadgeologica.es/publicaciones_geotemas.htmlopen access552.5TertiaryCentral ChinaTianshui-Qinan BasinAlluvial fanLake depositsCalcretesPetrología