@WFS,World Fosssil Society,Riffin T Sajeev,Russel T Sajeev

Calcium Nodules as a Proxy for Quaternary Paleoclimate Change on China’s Loess Plateau

Citation: He W, He H, Zhu M (2015) Calcium Nodules as a Proxy for Quaternary Paleoclimate Change on China’s Loess Plateau. PLoS ONE 10(12): e0143928. https://doi.org/10.1371/journal.pone.0143928

Editor: Juan A. Añel, Universidade de Vigo, SPAIN

Abstract

Changes in paleosol organic matter and the content of three forms of carbonate (PCaCO3, which represents CO3, and CaCO3).SOM, soil organic matter.

Different proxies have been used to investigate Quaternary paleoclimate change. Here, we used weathering of calcium nodules in paleosols on China’s Loess Plateau as a proxy for Quaternary paleoclimate changes to provide an alternative indicator of these changes. Paleosol and carbonate nodules were collected from Luochuan and Lantian counties in Shaanxi Province, China. We found that this approach allowed quantitative reconstruction of temperature, rainfall, soil mineral composition, and the effects of weathering and leaching. The changes in carbonate content in the loess and paleosol sequences were controlled by alternating dry and wet climatic conditions. Nodule formation conditions were directly affected by the leaching and migration of elements. The loess and paleosol sequences developed calcium nodules, and their formation was closely related to the rainfall and leaching characteristics of the paleoclimate. The paleoclimate and soil minerals affected the vegetation types and directly influenced changes in the soil. During formation of the calcium nodules, the surface vegetation evolved slowly, and the number of species and quantity of vegetation both decreased.

@WFS,World Fosssil Society,Riffin T Sajeev,Russel T Sajeev