A comparative study of aquifer systems occurring at the Paraná sedimentary basin, Brazil: U-isotopes contribution
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- 作者：D. M. Bonotto (1)
- 关键词：Groundwater ; Uranium isotopes ; Paraná sedimentary basin
- 刊名：Environmental Earth Sciences
- 出版年：2013
- 出版时间：March 2013
- 年：2013
- 卷：68
- 期：5
- 页码：1405-1418
- 全文大小：599KB
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1. Instituto de Geociências e Ciências Exatas-IGCE, Universidade Estadual Paulista-UNESP, Av. 24-A No. 1515, PO Box 178, Rio Claro, S?o Paulo, 13506-900, Brazil - ISSN：1866-6299
文摘
The radioactivity due to 238U and 234U in three aquifer systems occurring within the Paraná sedimentary basin, South America, has been investigated. Uranium is much less dissolved from fractured igneous rocks than from the porous sedimentary rocks as indicated by the U-mobility coefficients between 7.6?×?10? and 1.2?×?10??g?cm?. These values are also compatible with the U preference ratios relative to Na, K, Ca, Mg and SiO2, which showed that U is never preferentially mobilized in the liquid phase during the flow occurring in cracks, fissures, fractures and faults of the igneous basaltic rocks. Experimental dissolution of diabase grains on a time-scale laboratory has demonstrated that the U dissolution appeared to be a two-stage process characterized by linear and second-order kinetics. The U dissolution rate was 8?×?10?6?mol?m??s? that is within the range of 4?×?10?6-?×?10?4?mol?m??s? estimated for other rock types. The 234U/238U activity ratio of dissolved U in solutions was higher than unity, a typical result expected during the water–rock interactions when preferential 234U-leach from the rock surfaces takes place. Some U-isotopes data allowed estimating 320?ka for the groundwater residence time in a sector of a transect in S?o Paulo State. A modeling has been also realized considering all U-isotopes data obtained in Bauru (35 samples), Serra Geral (16 samples) and Guarani (29 samples) aquifers. The results indicated that the Bauru aquifer waters may result from the admixture of waters from Guarani (1.5?%) and Serra Geral (98.5?%) aquifers.