1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China 2. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China
Abstract:
In this paper the boron contents and boron isotopic composition of acid-soluble phases in loess and paleosol samples are determined for the first time. The boron contents of acid-soluble phases in the Luochuan loess section (S0–S2) vary within the range of (0.8–2.7)×10−6 and their δ11 B values vary from −1.8‱ to +18.6‱, mostly within the range of 0−+10‱. The boron contents and δ11 B values of paleosol layers are higher than those of loess layers, especially in the loess layer S1. Varying chemical weathering intensity and loess adsorption capability are the main factors leading to the variations of boron contents and δ11B values of acid-soluble phases in the loess section. The variation of chemical weathering intensity in response to the variation of climatic conditions seems to be the main factor leading to the variations of boron contents and δ11B values of acid-soluble phases in the loess section.
