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Communication Dans Un Congrès Année : 2011

Source and mobility of Rare Earth Elements in a sedimentary aquifer system: Aquitaine basin (Southern France)

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Résumé

The large Eocene Sand aquifer system of the Aquitaine sedimentary basin was studied through various hydrological, chemical and isotopic tools. This system extends over 116,000 km² in the South west part of the French territory. The aquifer being artesian in the west of the district and confined with piezometric levels around 250-m depth in the east. The 'Eocene Sands', composed of sandy Tertiary sediments alternating with carbonate deposits, is a multi-layer system with high permeability and a thickness of several tens of metres to a hundred metres. The Eocene Sand aquifer system comprises at least five aquifers: Paleocene, Eocene infra-molassic sands (IMS), early Eocene, middle Eocene, and late Eocene. One important feature, in these confined systems isolated from anthropogenic influence, is the range in salinities by a factor of 10, from 250 mg/L up to 2.5 g/L. The ΣREE, in the range 2-54 ng/L, with a dependence on salinity when expressed in % HCO3 or SO4, reflect the carbonate or evaporite source of REEs. The UCC normalized-REE patterns show a large variability as exemplified by the REE flat patterns-low SREE associated with salinity controlled by HCO3.
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Dates et versions

hal-00630766 , version 1 (10-10-2011)

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  • HAL Id : hal-00630766 , version 1

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Philippe Négrel, Emmanuelle Petelet-Giraud, Romain Millot, Eline Malcuit. Source and mobility of Rare Earth Elements in a sedimentary aquifer system: Aquitaine basin (Southern France). AGU Fall meeting 2011, Dec 2011, San Francisco, United States. pp.H34C-02. ⟨hal-00630766⟩

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