[Deeper Digs] Characterization of Obsidian and Coarse to Fine-Paste Ceramics with Handheld XRF
Applications of XRF in archaeology have expanded beyond the analysis of homogenous materials, such as obsidian, to include more heterogenous materials used, created, formed, or associated with human practices. Applications therefore include characterizations of ceramics, metals, glasses, soils, sediments, plasters, pigments/ residues, cherts, and metavolcanic or metasedimentary rocks. While obsidian analysis is relatively straightforward, the other materials require additional procedures before formulating interpretations based on geochemical attributes. This online seminar presents two case studies, one using obsidian artifacts from the western Great Basin and one using both coarse and fine-paste ceramics from Mesoamerica. In this seminar, the instructors examine appropriate methods to prepare specimens, to assess the precision and accuracy of results obtained, and discuss the strengths and weaknesses of different sample preparation techniques. While it is recognized that a ‘one size fits all’ method does not exist for all pXRF applications, we discuss what factors should be given careful consideration if the goal is to share data across projects and emphasize that such results are of the greatest utility to clients and stakeholders alike.