The Characterization and Composition of the Exterior Kasota Limestone with Regards to Weathering of the Cathedral of Saint Columba, Youngstown, OH
Brigitte Petras, SA-8989, Youngstown State University, Department of Geological and Environmental Sciences and Department of Chemistry
Purpose
The composition and characterization of building stones can give insight into the structure of the stone’s cavities, which en- able weathering and erosion. Previous studies of the building stone have been conducted by others [Twin City Testing (1918), Bowles (1918), and Sledge et al. (2017)] but this is the first analysis of the structure of the calcic dolomite, known as the Kasota (Mankato) stone, at this location.
Background
The Cathedral of Saint Columba in Youngstown was built in 1958 with Ordovician Kasota (Mankato) stone (see Figure 1) which has been quarried since the 1800s near the towns of Mankato and Kasota in southern Minnesota. Abundant trace fossils represent ancient burrows formed in a shallow-marine and tropical environment.
lowing techniques, at YSU or Materials Research Laboratory: Scanning Electron Microscopy and Energy Dispersive X-ray Spectroscopy (SEM/EDS), X-ray Florescence (XRF), and X-ray Diffraction (XRD). Adobe Photoshop was used to colorize some of the results. An unpolished thin section was used under po- larized light with a Leica Microscope (Figure 2). It was subse- quently covered in a thin layer of gold to provide conductivity
Figure 2 - 4X magnification of an unpolished thin section of Kasota stone from the Cathedral.
for the Topcon (ISI) scanning electron microscope of Paramus, NJ, SEM/EDS.
Determination of Structure
Figure 1 - Cathedral of Saint Columba, Youngstown, OH (Roadside Architecture, n.d.).
Materials and Methods Samples from the building were characterized, using the fol- 28 TPG
Jan.Feb.Mar 2019
Quartz and monocline were detected in both this study (Figure 3) and another study (Charola et al., 2017). Unique to this study, sanidine was detected, while orthoclase, micas, and clays were detected in the former study.
Elements of Kasota Stone
Table 1 on page 29 depicts the XRF data from three different studies. Twin City Testing (TCT) conducted their analysis on the stone quarried from Kasota and Bowles analyzed stones
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