Distribution and Environmental Information of Rb and Sr in the Mawo Karst Basin Sediments of Weining in Guizhou
详细信息
- 责任者：Cao Zhenxing (College of Resource and Environment Engineering ; Guizhou University ; Guiyang 550003 ; China) ; Wu Pan
- 刊名：Acta Geologica Sinica
- 出版年：2013
- 卷期：87(2)
- 关键词：铷 ; rubidium ; 锶 ; strontium ; 古气候 ; paleoclimate ; 贵州 ; Guizhou Province
- 页码：p.259-268
- 图表：illus., 2 tables, 37 refs.
- 分类号：1400
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
The evolution of karst basin plays a crucial role in earth surface processes, which well records the history of watershed erosion and chemical weathering. Rb/Sr has been widely used for revealing environmental information among different palaeoclimatic archives. In this study, based upon the 14C dates and characteristics of K and Ca in the Mawo karst basin sediments from Weining county of Guizhou province, the geochemical behaviour of Rb and Sr were analysed and Rb/Sr were compiled for the palaeoclimate in Northwest Guizhou. The results showed that concentrations of Rb in the four studied profiles were mostly greater than Sr, and strong positive correlations between Rb and K and between Sr and Ca were observed, which further confirmed the notion that Sr was more mobile than Rb in the evolution of Mawo karst basin. The vertical variation of Rb/Sr in all profiles suggested periodic sedimentary environment in the studied area, which corresponded to the field characteristics, especially the color variation of the sediments. High Rb/Sr primarily controlled by Rb indicated the arid climate or a low water level of the basin, otherwise the opposite. There existed 31 2 dry-moist climate cycles in the past 40ka of the karst basin that could be used as ideal archive for reconstructing palaeoclimate in karst areas.
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