TWO COLD-HUMID CLIMATIC EVENTS RECORDED IN THE EARLY PLEISTOCENE DEPOSITS OF THE LINXIA BASIN

摘要

The carbonate content in the stratigraphy of Loess and inland lakes is a sensitive indicator of climatic changes. 3267 samples in total were collected at 2.5 cm intervals from an 80 m thick lacustrine deposits, spanning 2.35 Ma, in the Dongshanding section of Linxia Basin. All the samples were analyzed by using a standard Bascomb calcimeter. The variation of carbonate contents shows that there exist two obvious