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Impact of gently dipping discontinuities on basement aquifer recharge: An example from Ploemeur (Brittany, France) by S. Ruelleu; F. Moreau; O. Bour; D. Gapais; G. Martelet is a Earth and Planetary Sciences article available to read on EtoBox.

What is Impact of gently dipping discontinuities on basement aquifer recharge: An example from Ploemeur (Brittany, France) about?

Classically, geological surveys of water resources in hard-rock aquifers are made from aerial photographs or geophysical techniques that basically permit to detect vertical features. On the other hand, aquifers only linked to vertical structures are very limited in space and offer in most cases very poor water resources. In the present case, we do show that an outstanding aquifer in Brittany is linked to a geological context associated with low-angle faults possibly directly connected with vertical feeders. In particular, we show through a high-resolution gravimetric survey that the highly fractured contact between granite and micaschists, which constitutes the main path for groundwater flow, is a gently dipping structure. Combined gravimetric, magnetic and geological data allowed us to establish the overall aquifer geometry by running a three-dimensional forward model. In addition, details about the shape of the contact have been obtained using an iterative scheme based on the method of Oldenburg (1974). The gravimetric model confirms the presence of sub-vertical faults that may constitute important drains for the aquifer recharge. Thus, the geological context associated with exce

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Author

S. Ruelleu; F. Moreau; O. Bour; D. Gapais; G. Martelet

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0926-9851)

Published

2010

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)