Oxygen isotope and geochemistry of groundwater from the surfical, Castle Hayne, and Peedee aquifers of southeastern North Carolina / by E. Lauren Hedges.
| Author/creator | Hedges, E. Lauren author. |
| Other author | Woods, Terri L., degree supervisor. |
| Other author | East Carolina University. Department of Geology. |
| Format | Theses and dissertations |
| Production | 2002. |
| Description | viii, 127 leaves : illustrations, maps (some color), charts ; 28 cm |
| Supplemental Content | Access via ScholarShip |
| Subjects |
| Summary | Samples of groundwater and surface waters in southeastern North Carolina were collected in July 2000 and April 2001 and analyzed for HCO3̄-, pH, SiO2, SO4 2-, P04 3-, Ca2+, Mg2+,Na+, K+, Fe2+, C1-, N03-, NH4+, F-, and ̥18O. Aquifer samples were taken from the Surficial, Castle Hayne, and Peedee. With the exception of calcium and magnesium in the Castle Hayne (CH), chemical trends for both the (CH) and Peedee (PD) Aquifers in the Southern Coastal Plain (SCP) indicate that major elements tend to increase moving away from the recharge area. Oxygen isotopes are useful tracers for distinguishing between aquifers, particularly the CH (-5.17 0 to --4.5 0) and PD (-5.04 0 to -2.68 0). Maximum estimated residence times for the Castle Hayne are approximately 7,000 years and those for the PD (15,000 years) indicate that some waters may have been recharged during the Last Glacial Maximum (LGM). Groundwater from both the CH and PD show ̥18O values heavier than modem meteoric water (-5.8 0). The observed values are most likely influenced by a number of factors, including saltwater intrusion, evaporation, and change of recharge season. Chemical data and ̥18O values for the majority of springs along Pages and Futch Creeks indicate that they flow out the CH. One spring on Futch Creek flows out of the PD based on major element chemistry and ̥18O values. Differences in hydrostratigraphy between the SCP and Northern Coastal Plain (NCP) account for many variations observed in both the chemical trends and isotopic signatures. While positive ̥18O relative to modem water was also observed in the NCP, it was proposed to be a result of mixing with LGM seawater, isotopic exchange during water/rock interaction, and the reservoir effect. |
| General note | Presented to the faculty of the Department of Geology. |
| General note | Advisor: Terri Woods |
| Dissertation note | M.S. East Carolina University 2002 |
| Bibliography note | Includes bibliographical references (leaves 90-94). |
| Genre/form | dissertations. |
| Genre/form | Academic theses. |
| Genre/form | Academic theses. |
| Genre/form | Thèses et écrits académiques. |
Availability
| Library | Location | Call Number | Status | Item Actions |
|---|---|---|---|---|
| Joyner | University Archives | ASK AT SPECIAL COLLECTIONS DESK | ✔ Available | Request Material |
| Electronic Resources | Access Content Online | ✔ Available |