Calcite Cementation in the Upper Floridan Aquifer: A Modern Example for Confined-Aquifer Cementation Models?

David A. Budd, Ursula Hammes, H. L. Vacher

Research output: Contribution to journalArticlepeer-review

Abstract

Detailed petrographic study of the Oligocene Suwannee limestone (a principal unit of the upper Floridan aquifer system) indicates that all the calcite cements in the Suwannee limestone are precompaction in origin. Most are clearly associated with either early mineralogical stabilization or Oligocene subaerial exposure features. None of the cements are in isotopic (δ 18 O and δ 13 C) or trace element (Fe, Mn, and Sr) equilibrium with the extant aquifer waters. The cements therefore formed prior to the onset of regionally confined, freshwater aquifer conditions. These rocks have been basically inert with respect to calcite cementation during the past 5 to 10 m.y. while they have been part of the regional confined aquifer. Using this modern aquifer as an example, it is likely that confined paleoaquifer cementation has been overestimated as an explanation for regional cementation patterns in ancient limestones.

Original languageAmerican English
JournalGeology
Volume21
DOIs
StatePublished - Jan 1 1993

Disciplines

  • Earth Sciences

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