Paleohydrogeology of a Paleozoic sandstone aquifer within an intracratonic basin: Geochemical and structural controls

Using Production Well Behavior to Evaluate Risk in the Depleted Cambrian‐Ordovician Sandstone Aquifer System, Midwestern USA

“…Hadley et al (2020) simulated a large-scale aquifer test that occurred adjacent to the SFZ and found that bulk horizontal hydraulic conductivity (K h ) of the fault core is at least an order of magnitude less than the surrounding host rock at a regional scale. Kelly et al (2018) also found that structural features such as the LaSalle anticlinal belt influence groundwater chemistries and recharge to the deep sandstone units.…”

“…Kelly et al. (2018) also found that structural features such as the LaSalle anticlinal belt influence groundwater chemistries and recharge to the deep sandstone units.…”

Impact of salinity origin on microbial communities in saline springs within the Illinois Basin, USA

“…The discharged water, that is, spring water, is typically chemically reduced, in many cases enriched with reduced sulfur or iron species that originate from a deep evaporated seawater source interacting with pyritic coal and shale in the shallow subsurface at 50-500 m depth. The spring water also contains variable concentrations of Cl À , Na + , Ca 2+ , and Mg 2+ because of different salinity sources and dilution by intersected fresh groundwater (Kelly et al, 2018;Panno et al, 1994Panno et al, , 2006Panno et al, , 2013Panno et al, , 2018Panno et al, , 2022. These springs can be grouped into saline (Cl À > 80 mg L À1 ) and non-saline Fe-or S-rich mineral springs.…”

“…The discharge is generally found along basin margins and geologic structures, such as fractured bedrock associated with folds and faults, and mainly exists in three types: (1) free‐flowing springs, (2) salt licks, and (3) bedrock seeps. More than 40 such occurrences have been identified in the Illinois Basin, and their chemical and isotopic composition, origin of geological stratum, salinity source, and relationships with the bedrock geology have been studied previously (Kelly et al, 2018 ; Panno et al, 1994 , 2013 , 2018 ). The discharged water, that is, spring water, is typically chemically reduced, in many cases enriched with reduced sulfur or iron species that originate from a deep evaporated seawater source interacting with pyritic coal and shale in the shallow subsurface at 50–500 m depth.…”

“…These springs can be grouped into saline (Cl − > 80 mg L −1 ) and non‐saline Fe‐ or S‐rich mineral springs. The location and geochemistry of these saline and mineral springs are controlled by multiple geological, hydrological, and geochemical factors, such as bedrock lithology, groundwater‐chemical composition, rock–water interactions, geologic structure, and groundwater flow regime (Kelly et al, 2018 ; Labotka et al, 2015 ; Panno et al, 2018 , 2022 ).…”