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Tracing ground-water evolution in a limestone aquifer using Sr isotopes; effects of multiple sources of dissolved ions and mineral-solution reactions; with Suppl Data 9435


, : Tracing ground-water evolution in a limestone aquifer using Sr isotopes; effects of multiple sources of dissolved ions and mineral-solution reactions; with Suppl Data 9435. Geology (Boulder) 22(8): 687-690

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 (super 87) Sr/ (super 86) Sr and Sr/Ca ratios than the updip parts of the aquifer. Ground waters and host limestones display similar stratigraphic trends in (super 87) Sr/ (super 86) Srand Sr/Ca. The ground waters have lower (super 87) Sr/ (super 86) Sr values, however, indicating that they acquire a significant fraction of their dissolved Sr through interaction with components of Tertiary rocks, which composethe 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.

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