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Dissolved Organic and Inorganic 14C Concentrations and Ages for Coastal Plain Aquifers
Abstract
The Aquia (Paleocene) and Magothy (Late Cretaceous) Formations of the Atlantic Coastal Plain represent
two well-characterized (hydrodynamically and geochemically) aquifers in southern Maryland. 14C measurements of the dissolved organic (DOC) and inorganic carbon (DIC) of Aquia and Magothy groundwaters have been made using accelerator mass spectrometry (AMS). Both DI14C and D014C concentrations in the initial flow path are unexpectedly low. As the water progresses farther from the recharge area, the D114C percent modern carbon (pMC) is consistently lower than the D014C pMC; this difference stays constant for all samples. The 14C-derived ages for an Aquia water sample downgradient at Site 4 are 17 ka and 12 ka for D114C and D014C, respectively. Radiocarbon ages have been compared to ages determined by two other independent dating methods: computer-simulated hydrodynamic modeling and age estimates based on changes in C1-,180 and 2H distributions, which are interpreted to be influenced by sea level and climate.
two well-characterized (hydrodynamically and geochemically) aquifers in southern Maryland. 14C measurements of the dissolved organic (DOC) and inorganic carbon (DIC) of Aquia and Magothy groundwaters have been made using accelerator mass spectrometry (AMS). Both DI14C and D014C concentrations in the initial flow path are unexpectedly low. As the water progresses farther from the recharge area, the D114C percent modern carbon (pMC) is consistently lower than the D014C pMC; this difference stays constant for all samples. The 14C-derived ages for an Aquia water sample downgradient at Site 4 are 17 ka and 12 ka for D114C and D014C, respectively. Radiocarbon ages have been compared to ages determined by two other independent dating methods: computer-simulated hydrodynamic modeling and age estimates based on changes in C1-,180 and 2H distributions, which are interpreted to be influenced by sea level and climate.