河南孟津寺河南中全新世湖泊沉积物的易溶盐测定及其古水文意义

通过对寺河南中全新世湖泊沉积物的易溶盐HCO3-,Cl-,SO42-,Ca2 ,Mg2 等5项离子的测定和分析,可以恢复古湖泊的水文演变过程。结果表明,在湖泊存在期间,该湖泊属于重碳酸盐型的淡水湖类型,湖水盐度总体呈增加趋势,并于约5660aBP和4040aBP开始分别出现两次较明显的咸化过程。易溶盐变化所反映的两次湖水咸化过程不仅与前人根据孢粉和软体动物的研究结果一致,也与该地区气候变化背景下的古湖泊演变过程基本吻合。

Paleo-Hydrological Signification in Mid-Holocene Revealed by the Analysis of Soluble Salts of Sihenan Profile in Mengjin,Henan Province

According to the determination and analysis for the soluble salts of Sihenan lake sediments,the paleo-hydrological evolvement of the lake in Mid-Holocene can be recovered.Five kinds of ions were selected for the determination,including HCO-_3,Cl-,SO 2-_4,Ca 2 and Mg 2 .The results indicate that the lake was a freshwater lake of hi-carbonate type,and the salt concentration increased with the evolvement of the lake.Two salting periods appeared around 5660aBP and 4040aBP respectively.Compared with the results concluded from the study for pollens and mollusk fossils,the conclusion drawn from soluble salts coincides with them,which also accords with the lake evolvement history in the background of regional climate change.