Structural framework of the Edwards Aquifer recharge zone in south-central Texas

Citation

Material Information

Title:
Structural framework of the Edwards Aquifer recharge zone in south-central Texas
Series Title:
GSA Bulletin
Creator:
A. Ferrill, David
W. Sims, Darrell
J. Waiting, Deborah
P. Morris, Alan
M. Franklin, Nathan
L. Schultz, Alvin
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Aquifers ( local )
Balcones Fault Zone ( local )
Bexar County Texas ( local )
Block Structures ( local )
Carbonate Rocks ( local )
Comanchean ( local )
Confined Aquifers ( local )
Cretaceous ( local )
Edwards Aquifer ( local )
Edwards ( local )
Formation ( local )
Faults ( local )
Ground ( local )
Water ( local )
Hydraulic Conductivity ( local )
Limestone ( local )
Lower Cretaceous ( local )
Mesozoic ( local )
Normal Faults ( local )
Permeability ( local )
Recharge ( local )
Sedimentary Rocks ( local )
Solution ( local )
Structural Controls ( local )
Systems ( local )
Texas ( local )
United States ( local )
South-Central Texas ( local )
Castle Hills Quadrangle ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
The Edwards Aquifer, the major source of water for many communities in central Texas, is threatened by population growth and development over its recharge zone. The location of the recharge and confined zones and the flow paths of the aquifer are controlled by the structure of and deformation processes within the Balcones fault system, a major system of predominantly down-to-the-southeast normal faults. We investigate the geologic structure of the Edwards Aquifer to assess the large-scale aquifer architecture, analyze fault offset and stratigraphic juxtaposition relationships, evaluate fault-zone deformation and dissolution and fault-system architecture, and investigate fault-block deformation and scaling of small-scale (intrablock) normal faults. Characterization of fault displacement shows a pattern of aquifer thinning that is likely to influence fault-block communication and flow paths. Flow-path constriction may be exacerbated by increased fault-segment connectivity associated with large fault displacements. Also, increased fault-zone deformation associated with larger-displacement faults is likely to further influence hydrologic properties. Overall, faulting is expected to produce strong permeability anisotropy such that maximum permeability is subhorizontal and parallel to fault-bedding intersections. At all scales, aquifer permeability is either unchanged or enhanced parallel to faults and in many cases decreased perpendicular to faults.
Original Version:
GSA Bulletin, Vol. 116, no. 3-4 (2004-03-01).

Record Information

Source Institution:
University of South Florida Library
Holding Location:
University of South Florida
Rights Management:
This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.

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