Geochemistry and source of solutes in ground water from the Marshall Sandstone regional aquifer, Michigan Basin
- Michigan State Univ., East Lansing, MI (United States) Geological Survey, Lansing, MI (United States)
- Geological Survey, Austin, TX (United States)
- Kent State Univ., OH (United States). Geology Dept.
Concentrations of dissolved solids in ground water near the limits of the subcrop of the Mississippian Marshall Sandstone are small and originate from meteoric-water/rock interactions. Concentrations of dissolved solids increase to that of brines toward the center of the basin: the dissolved solids are hypothesized to originate from evaporated seawater. This study examines the geochemistry of the solutes in this aquifer and compares these results to the geochemistry and source of solutes in Devonian formations that lie under this aquifer but that are separated from it by approximately 950--1,800 feet of shale. Analysis of geochemical data indicates that: (1) hydrochemical facies range from Ca-HCO[sub 3] in the subcrop area to Na-Cl and Ca-Cl in the basin center; (2) ion ternary diagrams and isotopic ratios indicate mixing of meteoric water with brine; (3) Cl:Br, Cl:Na, and Carpenter Function:Cl ratios suggest that the Marshall brine is similar to seawater evaporated beyond halite precipitation; (4) ion:Br ratios indicate that the Marshall brine is enriched in Ca and depleted in SO[sub 4], Mg, and K with respect to equivalently evaporated seawater; and (5) most of the brine samples are at or near equilibrium with respect to calcite, dolomite, and anhydrite, and the fresher meteoric water samples are near equilibrium with respect to calcite. Brine-freshwater mixes in the Marshall Sandstone are geochemically and isotopically similar to brines in the Devonian formations. Thus, the evolution of ground water in the Marshall Sandstone is hypothesized to be similar to that of the Devonian formations in which dilution of a marine brine by meteoric water is a dominant process and that other major geochemical processes, such as dolomitization, interaction with clays, and sulfate reduction occurred prior to dilution.
- OSTI ID:
- 5696168
- Report Number(s):
- CONF-921058--
- Journal Information:
- Geological Society of America, Abstracts with Programs; (United States), Journal Name: Geological Society of America, Abstracts with Programs; (United States) Vol. 24:7; ISSN GAAPBC; ISSN 0016-7592
- Country of Publication:
- United States
- Language:
- English
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58 GEOSCIENCES
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ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
AQUIFERS
BRINES
BROMIDES
BROMINE COMPOUNDS
CALCIUM CARBONATES
CALCIUM CHLORIDES
CALCIUM COMPOUNDS
CALCIUM HALIDES
CARBON COMPOUNDS
CARBONATES
CARBONIFEROUS PERIOD
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
DEVELOPED COUNTRIES
DEVONIAN PERIOD
EVAPORATION
GEOCHEMISTRY
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GROUND WATER
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
METEORIC WATER
MICHIGAN
MINERAL RESOURCES
MIXING
NATURAL GAS DEPOSITS
NORTH AMERICA
ORIGIN
OXYGEN COMPOUNDS
PALEOZOIC ERA
PHASE TRANSFORMATIONS
RESOURCES
ROCK-FLUID INTERACTIONS
SEAWATER
SODIUM CHLORIDES
SODIUM COMPOUNDS
SOLUTES
USA
WATER