681 Figure 5 – SEM images of PT1, PT2, PT3, and PT4. Energy-dispersive X-ray spectroscopy (EDS) was performed to determine the elemental composition of the samples at the microscale. The results shown in Figure 6 confirm the compositional trends identified by XRF analysis. PT1 is predominantly composed of Fe and S, consistent with the presence of pyrite. PT2 is dominated by Si and O, corresponding to quartz-rich phases. PT3 and PT4 are primarily composed of Ca, C and O, confirming the predominance of calcite. Figure 6 – EDS analysis spectra of PT1, PT2, PT3, and PT4.
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