[Eoas-seminar] Greene MS Defense - Reminder!

[eoas-seminar at lists.fsu.edu]

Good morning,

Please join us for Jade Walker Greene's MS Defense on October 7th at 9 AM in EOAS 5067.

Title: Geochemical Investigation of Sulfur Springs in the Woodville Karst Plain



Name: Jade W. Greene

Date: 10/7/2026

Time: 9AM - 12 PM

Location: EOAS 5067

Major Professor: Seth Young


 Abstract: Sulfur cycling and redox evolution within sulfur springs in the Woodville Karst Plain are governed by groundwater residence time, water–rock chemical reactions, microbial sulfate reduction, and connate groundwater and seawater influx. The dynamics of these mechanisms are influenced by hydraulic controls, including fluctuations in the potentiometric surface of the Upper Floridan aquifer and associated pressure changes that regulate groundwater flow and mixing. This study uses physiochemical parameters, major ion chemistry, sulfur isotopes, and solid-phase bedrock geochemistry to identify distinct geochemical regimes between inland sulfate-reducing springs and coastal, marine-influenced systems. Inland sites, including St. Marks Sulfur Spring #2, Newport Spring, and Newport Park Well, display strongly reducing conditions characterized by low concentrations of dissolved oxygen, negative oxidation–reduction potentials, and large sulfur isotope fractionations consistent with prolific microbial sulfate reduction. Geochemical comparisons between aquifer lithology and spring waters indicate that sulfate at these sites is primarily derived from dissolution of sulfate-bearing minerals within deeper strata of the aquifer, suggesting longer residence time groundwater. In contrast, coastal sites such as Panacea Mineral Spring #1 and Shepherd Spring display elevated major ion concentrations and sulfur isotope compositions consistent with modern-day Gulf of Mexico seawater, indicating active mixing between marine and freshwater end members and shorter groundwater residence times. The results of this study reveal a geochemical distinction within the aquifer, where inland sulfur springs evolve along redox-driven pathways dominated by sustained sulfate loading and microbial sulfate reduction and coastal sites reflecting freshwater and seawater mixing. Incorporating isotopic and geochemical characteristics provides a framework for interpreting sulfur sources, redox evolution, and vulnerability to seawater intrusion in the Floridan aquifer system.

Best,
Adea





Adea Arrison

Sr. Academic Program Specialist

Department of Earth, Ocean & Atmospheric Science

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