Peterhänsel, A. and Egenhoff, S. O. (2008) Lateral discrepancies of cycle patterns in the Latemàr, Triassic, Italian Dolomites. In: Controls on Carbonate Platform and Reef Development. Special Publication SEPM, 89 . SEPM (Society for Sedimentary Geology). ISBN 9781565761308
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Abstract
The well-known cyclic carbonate succession of the Middle Triassic Latemàr Massif in the Italian Dolomites reveals significant lateral variability in cycle numbers in platform-interior strata. Within an interval of 60 m, a 25% increase in the number of marine flooding surfaces was detected when approaching the several-hundred-meters-wide tepee belt in the backreef area, which represents the maximum elevation of the isolated Latemàr buildup. The impact of high-frequency– low-amplitude sea-level fluctuations on this elevated zone resulted in the development of spatially restricted intermittent emergence and marine flooding surfaces bounding small-scale upward-shallowing cycles. It is postulated that these alternations of submergence and subaerial exposure have favored tepee formation. Sediment collecting in the saucer-shaped tepee megapolygons further expedited upward shallowing of small-scale cycles. Conversely, deeper parts of the lagoon remained largely unaffected by high-frequency, lowamplitude sea-level oscillations: marine flooding surfaces disappear and cycles amalgamate. It is concluded that tepee structures are generally confined to topographically elevated areas where low-amplitude sea-level fluctuations were recorded. Lateral variations in cycle stacking pattern should be commonplace in shallow carbonate buildups throughout the geological record, where paleorelief existed in the platform interior.
| Item Type: | Book Section |
|---|---|
| Additional Information: | Probably counts as NIL AREP - work based on dept work but has been away from dept for some time |
| Uncontrolled Keywords: | IA54 |
| Subjects: | 02 - Geodynamics, Geophysics and Tectonics |
| Divisions: | 02 - Geodynamics, Geophysics and Tectonics |
| Volume: | 89 |
| Depositing User: | Sarah Humbert |
| Date Deposited: | 16 Feb 2009 13:01 |
| Last Modified: | 23 Jul 2013 10:01 |
| URI: | http://eprints.esc.cam.ac.uk/id/eprint/46 |
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