Data for: K isotope behavior in topsoil from the southeastern margin of the Ti-betan Plateau

K isotope data for the manuscript entitled "K isotope behavior in topsoil from the southeastern margin of the Tibetan Plateau" to be published in Geochimica et Cosmochimica Acta. The SupplementaryData.xlsx file contains three tables: K isotope ratios, elemental results, and XRD results for the study region. The SupplementaryFigure.docx file contains a figure showing the elemental concentrations of K, Na, Mg, Fe, Al, and Ti in the study area.