Geochemical Study of a Crater Lake: Lake Pavin, France:A View through Li-O-H Isotopes☆

Abstract Here we report δ 18 O values and for the first time δD and lithium isotopic data for the Pavin crater lake (French Massif Central). In its deeper unmixed part, this meromictic lake presents low H and O isotope compositions as a result of CO 2 intrusion and the presence of mineral water ingress. This influence of sub-lacustrine water contribution is confirmed by lithium isotopes with low δ 7 Li values.