Travertine is calcium carbonate precipitated from groundwater and spring water, and is widely distributed in northwest Iran. It is one of the suitable samples which can reconstruct paleoenvironment on land with a high resolution.In this study, I first determine the formation age of the travertine and then reveal its source by a series of data of 14C, δ13C, δ18O, 87Sr/86Sr and major- and trace-elemental compositions.
