Age determination and hydrochemistry of groundwater from the Kaikoura plains, New Zealand

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van der Raaij, R.W. 2010 Age determination and hydrochemistry of groundwater from the Kaikoura plains, New Zealand Lower Hutt, N.Z.: GNS Science. GNS Science report 2010/05 41 p.

Abstract: Tritium (3H), CFC, SF6, Ar-N2, oxygen-18 and chemistry measurements have been carried out on groundwater samples from fifteen bores on the Kaikoura Plains as part of a study into groundwater resources in this area by Environment Canterbury. The measurements have been used to determine the age and recharge source of the groundwater drawn from the bores, and to examine the relationship between groundwater age and hydrochemistry. The bores range between 12 and 53 metres in depth and are screened into gravel-dominated aquifers formed in alluvial fan deposits. In addition, oxygen-18 data from two surface water sites sampled in 2009 and previously published tritium and oxygen-18 data from 14 bores and 2 rivers has been used to aid in the groundwater age interpretation. (auth/DG)