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Extramural Research

Grantee Research Project Results

NCER Grantee Research Project Results

Central Texas Cave Speleothems as Tracers of Long-Term Variations in Groundwater Chemistry and Flow Routes: Implications for Regional Paleoclimate

EPA Grant Number: U915135
Title: Central Texas Cave Speleothems as Tracers of Long-Term Variations in Groundwater Chemistry and Flow Routes: Implications for Regional Paleoclimate
Investigators: Musgrove, MaryLynn
Institution: University of Texas at Austin
EPA Project Officer: Manty, Dale
Project Period: September 1, 1997 through September 1, 2000
Project Amount: $102,000
RFA: STAR Graduate Fellowships (1997)
Research Category: Fellowship - Geology , Academic Fellowships , Ecological Indicators/Assessment/Restoration

Description:

Objective:

The objective of this research project is to determine whether temporal changes in groundwater chemistry, as recorded in carbonate cements deposited from groundwater in caves (speleothems) over recent geologic time, may be utilized and used to understand mechanisms and time scales of variations in groundwater chemistry and their relation to climatic and hydrologic factors.

Approach:

The Edwards aquifer of central Texas is developed in karstified Cretaceous limestone, and it is the most significant water resource for the region. Numerous studies have detailed the development of the aquifer, fluid hydrodynamics, and groundwater and limestone geochemistry. In this research project, the integration of strontium and uranium-series isotope measurements in conjunction with other geochemical and hydrologic tracing tools (e.g., carbon and oxygen isotopes and trace elements), is being investigated toward providing improved sensitivity for reconstructing environmental records, and unique insight into the links between climate variability, hydrology, and water chemistry.

Supplemental Keywords:

fellowship, geochemistry, karst, caves, speleothems, geochronology, hydrogeology., Scientific Discipline, Geographic Area, Water, Hydrology, Environmental Chemistry, State, Analytical Chemistry, Engineering, Chemistry, & Physics, Environmental Engineering, water contamination detection, speleothems, chemical composition, chemical detection techniques, geochemistry, Texas (TX), aquatic resources, hydrodynamics, groundwater, climatology

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The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.

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