Carbon isotope systematics of the Cambrian-Vendian aquifer system in the northern Baltic Basin: Implications to the age and evolution of groundwater

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• 作者：Valle Raidla ; Kalle Kirsim?e ; Rein Vaikm?e ; Enn Kaup ; T?nu Martma
• 刊名：Applied Geochemistry
• 出版年：2012
• 出版时间：October, 2012
• 年：2012
• 卷：27
• 期：10
• 页码：2042-2052
• 全文大小：715 K

文摘

Groundwater in the Cambrian-Vendian aquifer system has a strongly depleted stable isotope composition (¦Ä¹⁸O values of about ?22¡ë) and a low radiocarbon concentration, which suggests that the water is of glacial origin from the last Ice Age. The aim of this paper was to elucidate the timing of infiltration of glacial waters and to understand the geochemical evolution of this groundwater. The composition of the dissolved inorganic C (DIC) in Cambrian-Vendian groundwater is influenced by complex reactions and isotope exchange processes between water, organic materials and rock matrix. The ¦Ä¹³C composition of dissolved inorganic C in Cambrian-Vendian water also indicates a bacterial modification of the isotope system. The corrected radiocarbon ages of groundwater are between 14,000 and 27,000 radiocarbon years, which is coeval with the advance of the Weichselian Glacier in the area.