A diffusive ion flux of non-marine origin in Cumbrian lake sediments: Implications for element budgets in catchments

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Scientific paper

Diffusion controlled concentration gradients of many elements exist in the sediments of Derwentwater Lake (Cumbria, Northern England) which indicate hydraulic connection with a reservoir of high salinity water. A widely distributed source of saline groundwater beneath Cumbria, with a composition that is compatible with anomalous surface water chemistry, is demonstrated. Element and stable isotope characteristics indicate that the most likely source of enhanced salinity is from water-rock interaction at depth, involving the Lake District granite batholith and surrounding meta-sediments. These results demonstrate the permeability and reactivity of basement rocks and suggest also that chloride cannot be regarded as conservative in water balance studies.

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