The proxy data reported here are measured from a sediment core collected from the Hashilan Wetland in the Zagros Mountains of western Iran. For Loss-on-Ignition (LOI), samples with 1 cm3 volume were dried overnight at 105 °C and weighed. The dry samples were combusted at 550 °C for 4 hrs and at 950 °C for 2 hrs to determine OM and CaCO3 contents of the samples, respectively. The percentage of non-carbonate mineral matter (NCMM: LOI residue) was calculated using the following formula: 100 – LOI (in %). The analyses were carried out at the Faculty of Geography, University of Tehran.