Global cooling controls on the chemical weathering as evidenced from the Plio-Pleistocene deposits of the North China Plain  

作　　者：YAO ZhengQuan1,2, XIAO GuoQiao1,2 & LIANG MeiYan2,3 1 State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710075, China 2 Graduate University of the Chinese Academy of Sciences, Beijing 100049, China 3 Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 

出　　处：《Chinese Science Bulletin》2010年第9期787-790,共4页

基　　金：supported by the National Natural Science Foundation of China (Grant No. 40730104) ;National Basic Research Program of China (Grant No. 2004CB720203)

摘　　要：Major element concentrations were analyzed on the sediments of a 203.6-m core from the North China Plain near Tianjin. The chemical index of alteration (CIA), Al2O3-(CaO+Na2O)-K2O diagram and elemental ratios, such as Al/K and Ti/Na, were used to reveal information of chemical weathering in the source regions since the late Pliocene. Results show that the fluvial materials in the North China Plain were derived from vast regions, which were in the early Na and Ca removal stage and underwent numerous upper-crustal recycling processes. Proxies of chemical weathering show a decreasing trend, in parallel with the global cooling since the late Pliocene, suggesting a strong role of the global cooing in controlling the continental chemical weathering intensity.Major element concentrations were analyzed on the sediments of a 203.6-m core from the North China Plain near Tianjin. The chemical index of alteration (CIA), Al2O3-(CaO+Na2O)-K2O diagram and elemental ratios, such as Al/K and Ti/Na, were used to reveal information of chemical weathering in the source regions since the late Pliocene. Results show that the fluvial materials in the North China Plain were derived from vast regions, which were in the early Na and Ca removal stage and underwent numerous upper-crustal recycling processes. Proxies of chemical weathering show a decreasing trend, in parallel with the global cooling since the late Pliocene, suggesting a strong role of the global cooing in controlling the continental chemical weathering intensity.

关 键 词：the North China PLAIN late PLIOCENE chemical WEATHERING ice sheet global cooling 

分 类 号：P595[天文地球—地球化学]