“…Parkam is selected as case study and in order to evaluate the proposed combined U-N and U-A models because this area and its condition (sample type, their grid, alteration map, etc.) is very suitable for validation of methods performance based on previous studies (Ghannadpour et al 2015b, 2017a; Ghannadpour and Hezarkhani 2018, 2020). It should be noted that sampling in Parkam was superficial and the samples located in sediments were collected either from rock outcrops or from trenches having access to rock.…”