Surface reflectance and pXRF for assessing soil weathering indexes - Souza, Arnaldo Barros e; Di Raimo, Luis Augusto Di Loreto; Mello, Danilo César de; Guimaraes, Clecia Cristina Barbosa; Urbina-Salazar, Diego F; Silva, Sérgio Henrique Godinho; Curi, Nilton; Dematte, Jose Alexandre Melo (Journal of South American Earth Sciences, 2022)