Secular Variation in the 87Sr/86Sr Composition of Groundwater, Stampriet Artesian Aquifer, Namibia
N. G. Hemming, M. Stute and A. S. Talma
Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, 10964, USA
Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, 10964, and Barnard College, Columbia University, New York, NY 10027, USA
Division of Water, Enviromnent and Forestry, CSIR, Pretoria, South Africa