Tracing groundwater evolution in a limestone aquifer using Sr isotopes: effects of multiple sources of dissolved ions and mineral-solution reactions

Citation

Material Information

Title:
Tracing groundwater evolution in a limestone aquifer using Sr isotopes: effects of multiple sources of dissolved ions and mineral-solution reactions
Series Title:
Geology
Creator:
Banner, Jay L.
Musgrove, MaryLynn
Capo, R.C.
Publisher:
Geological Society of America
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Alkaline Earth Metals ( local )
Antilles ( local )
Aquifers ( local )
Barbados ( local )
Calcium ( local )
Carbonate Rocks ( local )
Caribbean Region ( local )
Cenozoic ( local )
Chemical Ratios ( local )
Chemical Reactions ( local )
Geochemistry ( local )
Ground Water ( local )
Hydrochemistry ( local )
Ions ( local )
Isotope Ratios ( local )
Isotopes ( local )
Lesser Antilles ( local )
Limestone Metals ( local )
Pleistocene ( local )
Quaternary ( local )
Reefs ( local )
Sedimentary Rocks ( local )
Soils ( local )
Solution ( local )
Sr-87/Sr-86 ( local )
Stable Isotopes ( local )
Strontium ( local )
Trace Elements ( local )
Tracers ( local )
Upper Pleistocene ( local )
Water-Rock Interaction ( local )
West Indies ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
Uplifted Pleistocene coral-reef terraces on Barbados, West Indies, constitute an aquifer that is built on low-permeability Tertiary pelagic rocks that overlie the Barbados accretionary prism. The downdip segments of the aquifer are composed of younger reef limestones that contain more aragonite and have higher 87Sr/86Sr and Sr/Ca ratios than the updip parts of the aquifer. Ground waters and host limestones display similar stratigraphic trends in 87Sr/86Sr and Sr/Ca. The ground waters have lower 87Sr/86Sr values, however, indicating that they acquire a significant fraction of their dissolved Sr through interaction with components of Tertiary rocks, which compose the underlying aquitard and parts of overlying soils. Geochemical modeling results indicate that ground-water evolution is controlled by (1) variations in the age and composition of the aquifer and aquitard rocks and (2) the relative roles of calcite dissolution, calcite recrystallization, and the transformation of aragonite to calcite. Sr isotopes can provide unique information for tracing ground-water evolution, which requires consideration of the multiple components and processes that make up even relatively simple limestone aquifer systems. GeoRef Subject
Original Version:
Geology, Vol. 22, no. 8 (1994-08-01).

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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