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Process and rate of dedolomitization: mass transfer and C14 dating in a regional carbonate aquifer.

Geological Society of America Bulletin

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Abstract

Regional dedolomitization is the major process that controls the chemical character of water in the Mississippian Pahasapa Limestone (Madison equivalent) surrounding the Black Hills, South Dakota and Wyoming. The process of dedolomitization consists of dolomite dissolution and concurrent precipitation of calcite; it is driven by dissolution of gypsum. Deuterium and oxygen isotopic data from the ground water, coupled with regional potentiometric maps, show that recharge occurs on the western slope of the Black Hills and that the water flows N and W toward the Powder River Basin. Mass-balance and mass-transfer calculations were used to adjust 14C values to determine a range of groundwater flow velocities between 2 and 20 m/yr. The close agreement among the model results demonstrates that dedolomitization is controlling water-rock interactions in this regional carbonate aquifer system.-from Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Process and rate of dedolomitization: mass transfer and C14 dating in a regional carbonate aquifer.
Series title:
Geological Society of America Bulletin
Volume
94
Issue:
12
Year Published:
1983
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Geological Society of America Bulletin
First page:
1415
Last page:
1429