Origin of caves and other solution openings in the unsaturated (vadose) zone of carbonate rocks: A model for CO2 generation

Citation

Material Information

Title:
Origin of caves and other solution openings in the unsaturated (vadose) zone of carbonate rocks: A model for CO2 generation
Creator:
Wood, Warren W.
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Organic Carbon ( local )
Ground Water ( local )
Sedimentary Rocks ( local )
Carbonate Rocks ( local )
Geomorphology ( local )
Carbon Carbonates ( local )
Geochemistry ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
The enigma that caves and other solution openings form in carbonate rocks at great depths below land surface rather than forming from the surface downward can be explained by the generation of CO2 within the aquifer system. In the proposed model, CO2 is generated by the oxidation of particulate and/or dissolved organic carbon that is transported from the land surface deep into the unsaturated zone by recharging ground water. The organic material is oxidized to CO2 by aerobic bacteria utilizing oxygen that diffuses in from the atmosphere. Because gas transport in the unsaturated zone is controlled largely by diffusion, steady-state generation of even minute amounts of CO2 deep in the unsaturated zone results in the creation of large concentrations of CO2 at depth as it establishes a concentration gradient to the surface or other sink. Ground water descending into these areas of high CO2 concentration becomes thermodynamically subsaturated with respect to carbonate minerals and is able to dissolve them, thus forming the observed solution opening at depth.
Original Version:
Vol. 13, no. 11 (1985-11-01).

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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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