SS19: Molecules to Planets: Infrared spectroscopy in geochemistry, exploration geochemistry and remote sensing
Organizers / Organisateurs: Penny King, Mike Ramsay, Gregg Swayze
Room / Salle: AS 201
Time: 9:40 AM
Presenter: Jeffrey M. Byrnes
Infrared spectroscopic analysis of synthetic glasses: application to basaltic lava flow emplacement
Byrnes1, J.M., Ramsey, M.S., and King2, P.L. 1Department of Geology and Planetary Science, University of Pittsburgh, Pittsburgh, PA, USA, 15260-3332, email@example.com 2Department of Earth Sciences, University of Western Ontario, London, ON, N6A 5B7
To better assess and mitigate volcanic hazards associated with lava flows using infrared data, an improved understanding of the relationship between laboratory, field, and remote sensing data coupled with improved knowledge of flow field development is needed. Quantifying the physical changes that occur in silicate melts using infrared emission spectroscopy will provide a means to examine the affects of vesicle formation and distribution, surface chill coats, and short-range crystal lattice formation on the emitted infrared spectrum. The linkage between IR spectroscopy and lava cooling will yield important constraints for application to the basaltic lava flow field development. A suite of glasses will be synthesized in the Experimental Analysis Laboratory at the University of Western Ontario to represent a range of compositions and vesicle contents. Spectra of these samples will be collected using the FT-IR spectrometer housed in the University of Pittsburgh’s IVIS Laboratory. This will provide a first-order comparison between the spectral morphology and the crystallinity of the samples. The second phase of the study will be to collect spectra of samples cooling from above liquidus temperatures. The spectrometer will be fit with a heating/cooling/photography stage in order to provide a means to melt the synthetic glasses, collect their emitted thermal spectra, and obtain coincident digital images of the samples. Chilled samples will be analyzed using XRD analysis to determine the percentage and compositions of the crystals formed. These results will be compared with thermal emission spectra of basalt samples that represent distinct styles of lava flow emplacement that have been collected at the 1969-1974 Mauna Ulu flow field (Kilauea Volcano, Hawai'i, USA).