Denne, Richard2025-03-112025-03-112024-12-02https://repository.tcu.edu/handle/116099117/66900This study was an attempt to utilize a handheld LIBS to study mudrocks. The LIBS was tested on the Ernst Member of the Boquillas in Big Bend Ranch State Park and in the laboratory on the Swenson 1H core from McMullen County. The analyses on 5 Ernst outcrops found that samples need to be pelletized for optimal results with the LIBS, so it is not a useful field tool, but the XRF analyses found that the outcrops were not affected by hydrothermal fluids from the Solitario. Analyses of the core found an initial poor correlation between the handheld XRF and LIBS, which was improved after calibration of the LIBS and pelletizing the samples. These results were used to determine redox conditions and to correlate to nearby cores. The light element detection capability of the LIBS suggests potential for the study of mudrocks, but not as a stand-alone tool.Format: OnlineenGeologyBig Bend Ranch State ParkBoquillasLaser induced breakdown spectroscopyText