Despite a first study dating from 1986 (Richardson, 1986), magnetic mineralogy in peat was not considered and used as a potential palaeoenvironmental proxy until very recently. The first aim of our study was to determine what technics can be used on peat (SIRM, SARM and their demagnetization) and how, to overcome the specific problems arising from the use of peat : very low magnetic signal, evolution of the signal through time, etc. The relevant magnetic procedure was then applied to three peat cores frome La Trézence peat bog(Charente-Maritime, France) along with geochemical analyses giving informations on the environmental evolution throught time. After comparison of all the results, part of the magnetic mineralogy variations fits with environmental evolution. The other part can be concidered as a proxy of pedologic processes that studied geochemical parameters do not show.
