The geochemistry of boron and its isotopes in groundwaters from marine and non-marine sandstone aquifers |
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| Institution: | 1. Department für Geo- und Umweltwissenschaften, Ludwig-Maximilians-Universität München, Theresienstr. 41, 80333 München, Germany;2. Géoscience Environnement Toulouse, CNRS-UPS-OMP, 14 av. Édouard Belin, 31400 Toulouse, France;1. Predictive Mineral Discovery Cooperative Research Centre (pmd*CRC), School of Geosciences, Monash University, Victoria 3800, Australia;2. The Pheasant Memorial Laboratory for Geochemistry and Cosmochemistry, Institute for Study of the Earth''s Interior, Okayama University at Misasa, Tottori-ken 682-0193, Japan;1. Center of Deep Sea Research, Institute of Oceanography, Chinese Academy of Sciences, Qingdao 266071, China;2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China;3. CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;4. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;5. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing 100101, China;6. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;7. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi''an 710069, China;8. Center for Ocean Mega-Science, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, China;9. University of Chinese Academy of Science, Beijing 100101, China |
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| Abstract: | The geological evolution of B in two UK sandstone aquifers is followed from precipitation chemistry through to groundwaters in both the unconfined and confined zones. Measurements have been made of major element geochemistry, B concentrations and B isotopic ratios. The isotopic measurements were carried out using ICP/MS following a simple preconcentration step. Isotopic measurements of rainfall show a bimodal distribution and it is suggested that enriched signatures are characteristic of Atlantic air over Britain and depleted signatures representative of continental air. In the marine Lower Greensand aquifer dissolution of glauconite results in the mobilisation of B and a correlation with SO4 suggests that this dissolution is related to the oxidation of pyrite which appears to be the SO4-forming reaction in the aquifer. In the non-marine Hastings beds isotopic ratios and a correlation with HCO3 suggest that B is associated with the dissolution of ferroan carbonates. In both aquifers the geochemical evolution of B is complex and more information is needed on the behaviour of B isotopes during evapotranspiration and groundwater recharge. |
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