Abstract: End-member analysis (EMA) was performed on particle size data collected from 75 samples from the continuous Late
Pleistocene-Holocene Gedazhang (GDZ) loess-palaeosol profile in Xinzheng, Henan Province. Wavelet analysis was also performed for
the EMs in the time domain. The results show that three EMs can be separated from sediment particle sizes in the GDZ profile. EM2
may have been influenced by dynamic changes in the strength of the East Asian summer monsoon, with changes in temperature and
humidity caused by the summer monsoon resulting in weathering and pedogenesis. EM2 appears to have been influenced by the
dynamic effects of dust storm accumulation controlled by the northwesterly monsoon, and contains typical components of aeolian loess.
EM3 contains coarse-grained components that are indicative of strong transporting forces and proximal sediment sources influenced by
northeasterly winds from the Yellow River flood plain, particularly significant since 3100 a. Results of wavelet analysis show that each
EM has different periodic characteristics at different time scales. The EMA method is effective in indicating the sedimentary
environment and sediment source characteristics. The combined characteristics of each EM reflect the sedimentary dynamics and can
also derive sedimentary dynamic changes since the Late Pleistocene. The wavelet analysis method provides important results in terms
of cyclic features and trends of dynamics change in particle size within each EM.

Key words: Late Pleistocene, Loess-paleosol, grain size, End-Member analysis, wavelet analysis