Nasium

Identifiant de l'opération archéologique : F1355200100041 Date de l'opération : 2001 (PT) Depuis 1999, des recherches ont été relancées sur la ville gallo-romaine de Nasium. Le programme est fondé sur l'emploi combiné de techniques de reconnaissances archéologiques non destructives (recherches archivistiques, prospection aérienne et pédestres). Les premiers résultats ont notamment mis en évidence l'importance de l'extension de l'agglomération (voir Bilans scientifiques régionaux 1999 et 2000..

Nasium – Agglomération antique à Naix-aux-Forges et Saint-Amand-sur-Ornain

Identifiant de l'opération archéologique : F1355200100041 Date de l'opération : 2001 (PT) Depuis 1999, des recherches ont été relancées sur la ville gallo-romaine de Nasium. Le programme est fondé sur l'emploi combiné de techniques de reconnaissances archéologiques non destructives (recherches archivistiques, prospection aérienne et pédestres). Les premiers résultats ont notamment mis en évidence l'importance de l'extension de l'agglomération (voir Bilans scientifiques régionaux 1999 et 2000..

Reservoir theory for studying the geochemical evolution of soils

[1] Linking mineral weathering rates measured in the laboratory to those measured at the landscape scale is problematic. In laboratory studies, collections of minerals are exposed to the same weathering environment over a fixed amount of time. In natural soils, minerals enter, are mixed within, and leave the soil via erosion and dissolution/leaching over the course of soil formation. The key to correctly comparing mineral weathering studies from laboratory experiments and field soils is to consistently define time. To do so, we have used reservoir theory. Residence time of a mineral, as defined by reservoir theory, describes the time length between the moment that a mineral enters (via soil production) and leaves (via erosion and dissolution/leaching) the soil. Age of a mineral in a soil describes how long the mineral has been present in the soil. Turnover time describes the time needed to deplete a species of minerals in the soil by sediment efflux from the soil. These measures of time are found to be sensitive to not only sediment flux, which controls the mineral fluxes in and out of a soil, but also internal soil mixing that controls the probability that a mineral survives erosion. When these measures of time are combined with published data suggesting that a mineral’s dissolution reaction rate decreases during the course of weathering, we find that internal soil mixing, by partially controlling the age distribution of minerals within a soil, might significantly alter the soil’s mass loss rate via chemical weathering. Citation: Mudd, S. M., and K. Yoo (2010), Reservoir theory for studying the geochemical evolution of soils, J. Geophys. Res., 115, F03030, doi:10.1029/2009JF001591. 1