Models for generation of carbonate cycles
Journal Article
·
· Geology; (United States)
Computer modeling provides a quantitative approach to a better understanding of actual carbonate cyclic sequences. To model carbonate cycles, the authors can use water-depth-dependent sedimentation rate for each facies, an initial lag time, linear subsidence, tidal range, and period and amplitude of sea-level oscillation about a horizontal datum. Tidal-flat-capped cycles up to a few meters thick result from low-amplitude sea-level oscillation of a few meters and short lag times. Nonerosive caps reflect sea-level lowering being balanced by subsidence, and basinward migration of the shoreline not exceeding tidal-flat progradation rate. When higher amplitude sea-level oscillations occur, the tidal flats are abandoned on the inner shelf during sea-level fall, because seaward movement of the strandline outpaces progradation rate of flats. Increased amplitude also results in sea-level falling faster than flats can subside, so that disconformities with thick vadose profiles develop. High-amplitude (100 m or more) oscillations result in incipient drowning of platforms and juxtaposition of deep-water facies against shallow-water facies within cycles. Sea level falls before the platform can build to the sea-level highstand, and the shoreline migrates much more rapidly than tidal flats can prograde; thus, cycles are disconformity-bounded and lack tidal-flat caps. 10 references.
- Research Organization:
- Virginia Polytechnic Institute, Blacksburg
- OSTI ID:
- 7131779
- Journal Information:
- Geology; (United States), Journal Name: Geology; (United States) Vol. 14:2; ISSN GLGYB
- Country of Publication:
- United States
- Language:
- English
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