Matrix pore water in low-permeable crystalline bedrock: An archive for the palaeohydrogeological evolution of the Olkiluoto Investigation Site

Eichinger, F.; Waber, Niklaus; Smellie, J.A.T. (2013). Matrix pore water in low-permeable crystalline bedrock: An archive for the palaeohydrogeological evolution of the Olkiluoto Investigation Site. In: International Atomic, Energy Agency (ed.) Isotopes in Hydrology, marine ecosystems and climate change studies - Proceedings of the International Symposium held in Monaco, 27 March - 1 April 2011. Bd. 1. Proceedings series (pp. 73-82). Wien: IAEA

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Matrix pore water in the connected inter- and intragranular pore space of low-permeable crystalline bedrock interacts with flowing fracture groundwater predominately by diffusion. Based on the slow exchange between the two water reservoirs, matrix pore water acts as an archive of past changes in fracture groundwater compositions and thus of the palaeohydrological history of a site. Matrix pore water of crystalline bedrock from the Olkiluoto investigation site (SW Finland) was characterised using the stable water isotopes (δ18O, δ2H), combined with the concentrations of dissolved chloride and bromide as natural tracers. The comparison of tracer concentrations in pore water and present-day fracture groundwater suggest for the pore water the presence of old, dilute meteoric water components that infiltrated into the fractures during various warm climate stages. These different meteoric components can be discerned based on the diffusion distance between the two reservoirs and be brought into context with the palaeohydrological evolution of the site.

Item Type:

Book Section (Book Chapter)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geological Sciences > Rock-Water Interaction

UniBE Contributor:

Waber, Niklaus

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

0074–1884

ISBN:

978–92–0–135610–9

Series:

Proceedings series

Publisher:

IAEA

Language:

English

Submitter:

Niklaus Waber

Date Deposited:

11 Aug 2014 08:50

Last Modified:

06 Jun 2017 16:38

Related URLs:

URI:

https://boris.unibe.ch/id/eprint/49897

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