Spatial Variations in the Chemical Composition of Eolian Sediments in Hyperarid Regions: a Case Study from the Badain Jaran Desert, Northwestern China

A significant spatial variation in the chemical composition of eolian sediments is observed in hyperarid desert regions, particularly between marginal and central zones of the Badain Jaran Desert. This variation is primarily driven by differences in source rock chemistry rather than sedimentary sorting or precipitation heterogeneity. The study analyzed 115 samples of eolian sand, lacustrine sediment, and exposed bedrock using X-ray fluorescence spectrometry to determine elemental concentrations and ratios. Findings suggest that the Chemical Index of Alteration (CIA) may not be a reliable proxy for chemical weathering in hyperarid regions, necessitating caution in its use for paleoenvironmental reconstructions. This research enhances understanding of sediment transport and deposition processes in extreme environments.

Chen, Q., Li, Z., Dong, S., Wang, N., Lai, D. Y. F., & Ning, K. (2018). Spatial Variations in the Chemical Composition of Eolian Sediments in Hyperarid Regions: a Case Study from the Badain Jaran Desert, Northwestern China. Journal of Sedimentary Research, 88(2), 290–300. https://doi.org/10.2110/jsr.2018.11