Sr isotopes in natural waters: Applications to source characterisation and water-rock interaction in contrasting landscapes
Strontium isotopes are now routinely measured in hydrochemical studies to determine sources and mixing relationships. It is often assumed that in contrast to the commonly used stable isotopes of O,H, C and S, 87Sr/86Sr is not fractionated by low temperature processes such as dissolution and precipitation.However, recent modelling and laboratory studies have enhanced our understanding of how Sr isotopes behave in low temperature environments and challenged early assumptions about Sr behaviour. High 8TSr/86Sr may for example be caused by the preferential release of 87Sr from sites previously occupied by 87Rb due to contrasting ionic radii. Furthermore, variations in the weathering rates and mechanisms of different minerals can often make determining the weathering component of environments difficult. Nevertheless, Sr isotopes are useful, when combined with other hydrochemical data, to constrain models of water-rock interaction and mixing as well as geochemical processes such as ion-exchange. This paper presents a summary of recent work by the authors in constraining the sources of waters and weathering processes in surface catchments and aquifers.
P.Shand A.J.Love D.P.F.Darbyshire W.M.Edmunds
CSIRO Land and Water/CRC LEME, Glen Osmond, Australia Department of Water, Land and Biodiversity Conservation, Adelaide, Australia NERC Isotope Geosciences Laboratory, Keyworth, Nottingham, UK School of Geography, Oxford University Centre for the Environment, Oxford, UK
国际会议
第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)
昆明
英文
27-35
2007-07-31（万方平台首次上网日期，不代表论文的发表时间）