Lithium isotopes in waters of the tropical volcanic island of Guadeloupe: A proxy of high and low-temperature water-rock interactions

We also report the chemical composition of these waters (concentrations of dissolved Li, Na, K, Ca, Mg, Cl, S, SiO2). We show that the large range of δ7Li values (3.0 to 31.6 ‰) is explained by several water-rock interaction processes at the scale of this small island.

These results have important implications for characterizing the mean riverine flux of lithium coming from the weathering of continental volcanic rocks, understanding the global oceanic budget of lithium, and finally, for interpreting the δ7Li of past seawater.