Comprehensive mapping and compositional analysis of the Alca obsidian source, Peru: Datasets and Supplementary Materials

The data archive includes compositional and geographic data for geologic samples from the Alca obsidian source in the Peruvian Andes. Compositional data for geologic samples from six other Peruvian obsidian sources are also included. Tables S1-S4 provide data for samples in csv format: Table S1 neutron activation analysis (NAA) concentrations; Table S2 laboratory energy-dispersive x-ray fluorescence (ED-XRF) concentrations; Table S3 portable x-ray fluorescence (pXRF) concentrations; Table S4 portable x-ray fluorescence (pXRF) precision analysis. Concentrations are parts per million (ppm). Geographic coordinates are UTM Zone 18S, Datum WGS-84, elevations are meters above sea level. The ED-XRF and pXRF datasets include compositional data for geologic samples from six other Peruvian obsidian sources: Anillo, Chivay, Jampatilla, Lisahuacho, Potreropampa, and Quispisisa. Figures S1 and S2 are .tif maps plotting Alca obsidian geologic samples and Arma and Sencca ignimbrite formations mapped by Peru's Instituto Geológico Minero y Metalúrgico (INGEMMET). Details on methods, results, and significance are in Rademaker et al. 2021, Quaternary International. https://doi.org/10.1016/j.quaint.2021.11.029