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Title: Regional hydrodynamics and hydrochemistry of the uranium-bearing Oakville aquifer (Miocene) of south Texas. Report of investigations No. 124

Abstract

The Oakville Formation consists of sediments deposited by several major fluvial systems that traversed the Texas Coastal Plain during the Miocene Epoch. Facies geometry and composition, together with superimposed structure and topography, are important determinants of ground-water flow, aquifer transmissivity, and regional hydrochemical evolution. Topographically high areas along the Oakville outcrop are ground-water recharge zones. Downdip movement of ground water is deflected along strike into major incised stream valleys and modified by local ground-water pumping, resulting in discharge of Oakville water from relatively shallow sections of the aquifer. Discharge from local and intermediate-scale flow cells, as well as influx along growth faults of high-salinity water from deeper stratigraphic horizons, is readily shown by field phenomena. Introduction of exotic evolved connate waters is demonstrable by the distribution of sulfate, chloride, and reduced sulfur species. Shallow Oakville ground waters exhibit a clearly defined compositional change from predominantly sodium chloride waters in the southwest to calcium bicarbonate waters in the northeast. Redox potential (Eh) of Oakville ground water decreases from +470 mV (oxidizing) to -170 mV (reducing) with increasing depth and coincides with an increase in pH and tempertaure. Dissolved oxygen content exhibits an inverse relationship to Eh and reduced sulfur. Higher rechargemore » in the northeast results in a deeper subsurface penetration of oxygenated ground waters. The regional distribution of trace amounts of uranium, molybdenum, selenium, and arsenic in Oakville ground water demonstrates a good correlation with known sites of uranium mineralization, and defines elevated trace metal contents unrelated to known uranium occurrences. These same elements exhibit an overall increased background level in the southwestern section of the study area. 26 figures, 1 table.« less

Authors:
; ;
Publication Date:
Research Org.:
Texas Univ., Austin (USA). Bureau of Economic Geology
OSTI Identifier:
6146550
Report Number(s):
NP-3901761
ON: DE83901761
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; 58 GEOSCIENCES; GROUND WATER; GEOCHEMISTRY; REDOX POTENTIAL; TEXAS; HYDROLOGY; STRATIGRAPHY; URANIUM DEPOSITS; EXPLORATION; ACID CARBONATES; AQUIFERS; ARSENIC; CALCIUM; CHLORIDES; COPPER; EXPERIMENTAL DATA; HYDRODYNAMICS; IRON; MANGANESE; MINERALIZATION; MOLYBDENUM; PH VALUE; SELENIUM; SODIUM; SULFATES; TERTIARY PERIOD; TRACE AMOUNTS; URANIUM; ACTINIDES; ALKALI METALS; ALKALINE EARTH METALS; CENOZOIC ERA; CHEMISTRY; CHLORINE COMPOUNDS; DATA; ELEMENTS; FEDERAL REGION VI; FLUID MECHANICS; GEOLOGIC AGES; GEOLOGIC DEPOSITS; GEOLOGY; HALIDES; HALOGEN COMPOUNDS; HYDROGEN COMPOUNDS; INFORMATION; MECHANICS; METALS; MINERAL RESOURCES; NORTH AMERICA; NUMERICAL DATA; OXYGEN COMPOUNDS; RESOURCES; SEMIMETALS; SULFUR COMPOUNDS; TRANSITION ELEMENTS; USA; WATER; 050200* - Nuclear Fuels- Exploration- (-1987); 580100 - Geology & Hydrology- (-1989); 580400 - Geochemistry- (-1989)

Citation Formats

Smith, G E, Galloway, W E, and Henry, C D. Regional hydrodynamics and hydrochemistry of the uranium-bearing Oakville aquifer (Miocene) of south Texas. Report of investigations No. 124. United States: N. p., 1982. Web.
Smith, G E, Galloway, W E, & Henry, C D. Regional hydrodynamics and hydrochemistry of the uranium-bearing Oakville aquifer (Miocene) of south Texas. Report of investigations No. 124. United States.
Smith, G E, Galloway, W E, and Henry, C D. Fri . "Regional hydrodynamics and hydrochemistry of the uranium-bearing Oakville aquifer (Miocene) of south Texas. Report of investigations No. 124". United States.
@article{osti_6146550,
title = {Regional hydrodynamics and hydrochemistry of the uranium-bearing Oakville aquifer (Miocene) of south Texas. Report of investigations No. 124},
author = {Smith, G E and Galloway, W E and Henry, C D},
abstractNote = {The Oakville Formation consists of sediments deposited by several major fluvial systems that traversed the Texas Coastal Plain during the Miocene Epoch. Facies geometry and composition, together with superimposed structure and topography, are important determinants of ground-water flow, aquifer transmissivity, and regional hydrochemical evolution. Topographically high areas along the Oakville outcrop are ground-water recharge zones. Downdip movement of ground water is deflected along strike into major incised stream valleys and modified by local ground-water pumping, resulting in discharge of Oakville water from relatively shallow sections of the aquifer. Discharge from local and intermediate-scale flow cells, as well as influx along growth faults of high-salinity water from deeper stratigraphic horizons, is readily shown by field phenomena. Introduction of exotic evolved connate waters is demonstrable by the distribution of sulfate, chloride, and reduced sulfur species. Shallow Oakville ground waters exhibit a clearly defined compositional change from predominantly sodium chloride waters in the southwest to calcium bicarbonate waters in the northeast. Redox potential (Eh) of Oakville ground water decreases from +470 mV (oxidizing) to -170 mV (reducing) with increasing depth and coincides with an increase in pH and tempertaure. Dissolved oxygen content exhibits an inverse relationship to Eh and reduced sulfur. Higher recharge in the northeast results in a deeper subsurface penetration of oxygenated ground waters. The regional distribution of trace amounts of uranium, molybdenum, selenium, and arsenic in Oakville ground water demonstrates a good correlation with known sites of uranium mineralization, and defines elevated trace metal contents unrelated to known uranium occurrences. These same elements exhibit an overall increased background level in the southwestern section of the study area. 26 figures, 1 table.},
doi = {},
url = {https://www.osti.gov/biblio/6146550}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1982},
month = {1}
}

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