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Ammonite Taphocycles in Carbonate Epicontinental Platforms

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Fernández López, Sixto Rafael (1998) Ammonite Taphocycles in Carbonate Epicontinental Platforms. In Advances in Jurassic research 2000: proceedings of the Fifth International Symposium on the Jurassic System, held in Vancouver, Canada, August 12-25. GeoResearch forum (6). Trans Tech Publications, Uetikon-Zuerich, Switzerland,, pp. 293-300. ISBN 0878498443

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Resumen

Variations of preservational features of the successive recorded associations of
ammonites in carbonate epicontinental platforms enable distinction of taphonomic cycles induced
by relative sea-level changes. A taphocycle comprises two or more successive recorded-associations
showing cyclical variations in their taphonomic characters, resulting from an environmental cycle.
Shallowing-upwards sequences in carbonate outer platforms, and positive taphosequences, were
formed during phases of increasing water turbulence and decreasing rate of sedimentation. Positive
and negative taphosequences, (or taphosequences of increasing and decreasing turbulence), enable
identification of shallowing-upwards sequences and infilling sequences of fifth-order respectively.
Condensed sections show different characters in shallow and proximal environments in relation to
deep and distal environments of the carbonate epicontinental platforms. The degree of taphonomic
condensation in preserved ammonite associations reaches the highest values in shallow and
proximal environments of the platform, not in deep and distal environments, though the degree of
taphonomic heritage (i.e., the ratio of reelaborated (reworked) elements to total recorded elements)
can, in both cases, reach 100%. These taphonomic data are of stratigraphic interest since they
provide an independent test of the cycles distinguished in sequence stratigraphy.


Tipo de documento:Sección de libro
Palabras clave:Applied Taphonomy, Sequence Stratigraphy, Sea-Level Changes, Environmental Cycles, Iberian Basin
Materias:Ciencias > Geología > Paleontología
Código ID:22002
Depositado:19 Jun 2013 12:15
Última Modificación:11 Dic 2018 08:42

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