Ascending Deep Fluids into Shallow Aquifer at Hydraulically Active Segments of the Western Boundary Fault of the Rhine Graben, Germany: Constraints from ⁸⁷Sr/⁸⁶Sr ratios

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• 作者：Gerhard Schmidt^a ; ^{Gerhard.Schmidt@geow.uni-heidelberg.de} ; Sami Al Najem^a ; Margot Isenbeck-Schr&ouml ; ter^a ; Florian Freundt^b ; Michael Kraml^c ; René ; Eichstä ; dter^b ; Werner Aeschbach^b
• 关键词：Rhine Graben ; Fault ; Fluid ; Aquifer ; Tracer ; Strontium isotopic ratios
• 刊名：Procedia Earth and Planetary Science
• 出版年：2017
• 出版时间：2017
• 年：2017
• 卷：17
• 期：Complete
• 页码：81-84
• 全文大小：561 K
• 卷排序：17

文摘

87Sr/86Sr ratios have been used as a tracer of fault-controlled fluid ascent into shallow aquifers at the Western Boundary Fault (WBF) of the northern upper Rhine Graben in Germany, a major rift system of the European continent. The 87Sr/86Sr ratios and Sr contents from the Quarternary groundwater conducting sediments of the uppermost aquifer increase with decreasing distance to the WBF. The 87Sr/86Sr ratios and Sr contents of the shallow groundwater range from 0.70877 to 0.71022 and 0.41 to 2.30 mg/l, respectively. The Strontium isotope ratios are important tracers of hydrological processes such as water-rock interaction and groundwater mixing at active faults and thus a powerful geochemical tool for the detection of the ascent of deep fluids at hydraulically active segments of faults and its mixing with shallow recharged groundwater.