Calibrated geochemical ages of the Baltic Artesian Basin groundwater

Geologos

article

Vytautas Samalavičius¹  Jurga Arustienė¹ 

[1] Institute of Geosciences at Vilnius University

关键词: groundwater dating;    isotope geochemistry;    radiocarbon;    radiokrypton;   

DOI  :  10.14746/logos.2022.28.3.0001

学科分类：社会科学、人文和艺术（综合）

来源: Walter de Gruyter GmbH

【 摘 要 】

For the present study, geochemical ages were derived from radiocarbon and radiokrypton age calibration with ground-water chemical contents (Na+, K+, Mg2+, Ca2+, Cl−, SO42−, HCO3−). Geochemical ages may fill the dating gap (40–150 ka) between the isotope techniques mentioned. A case study of groundwater in the Baltic Artesian Basin has involved geochemical age calibration, data filtering (such as regional subdivision of the basin for more accurate results) and geochemical dating of groundwater of unknown age. Various approaches to interpretations of geochemical age results could be used. Bicarbonate and sulphate are sensitive to the hydrochemical environment and should be omitted from geochemical age calculations. Modern fresh groundwater samples should also be excluded from calibration in order to obtain more reliable trend lines. Calcium-sodium cation exchange occurs in deep aquifers and may be used for geo-chemical age determination of fossil groundwater.

【 授权许可】

CC BY-NC-ND