Preservation of forcing signals in shallow water carbonate sediments. Hill, J., Wood, R., Curtis, A., & Tetzlaff, D. M. Sedimentary geology, 275-276(1):79–92, July, 2012. doi abstract bibtex No consensus has been reached on whether the metre-scale cycles that commonly occur in peritidal carbonates are predominately a product of external relative sea-level variations (allocycles) or an intrinsic property of carbonate production generated via the interaction of non-linear processes (autocycles). For any forcing signal such as eustatic sea-level change, to be detectable in stratigraphy its effects must be preserved. Here, a deterministic, three-dimensional geological process model is used to explore how such cycles are preserved in the geological record in the presence of autocyclic processes. Each simulation produced cycle thickness distributions that are statistically indistinguishable from a theoretical Poisson process, regardless of whether auto- or allo-cycles dominated. Spectral analysis of depositional time series constructed from idealised geological sections showed that all detectable signals occurred within the Milankovitch forcing frequency bands, even when no Milankovitch forcing was present. Thus, it is deduced that from any geological section alone, external forcing signals are detectable but are not distinguishable from autocyclically produced signals. Interestingly, there is no correlation between the percentage of sediment preserved and the accuracy with which signals are detectable in the preserved sediment: in some model realisations, even with preservation as low as 40%, the correct forcing signal can be detected accurately while, conversely, sections with preservation as high as 90% can have poor signal preservation. The reverse can also be true in other models. It is therefore concluded that distinguishing allocyclic and autocyclic forcing in shallow marine or peritidal carbonate successions is likely to be extremely difficult except in cases of extraordinary sedimentary preservation and dating accuracy.
@ARTICLE{Hill2012-gg,
title = "{Preservation of forcing signals in shallow water carbonate
sediments}",
author = "Hill, Jon and Wood, Rachel and Curtis, Andrew and Tetzlaff,
Daniel M.",
abstract = "No consensus has been reached on whether the metre-scale cycles
that commonly occur in peritidal carbonates are predominately a
product of external relative sea-level variations (allocycles) or
an intrinsic property of carbonate production generated via the
interaction of non-linear processes (autocycles). For any forcing
signal such as eustatic sea-level change, to be detectable in
stratigraphy its effects must be preserved. Here, a
deterministic, three-dimensional geological process model is used
to explore how such cycles are preserved in the geological record
in the presence of autocyclic processes. Each simulation produced
cycle thickness distributions that are statistically
indistinguishable from a theoretical Poisson process, regardless
of whether auto- or allo-cycles dominated. Spectral analysis of
depositional time series constructed from idealised geological
sections showed that all detectable signals occurred within the
Milankovitch forcing frequency bands, even when no Milankovitch
forcing was present. Thus, it is deduced that from any geological
section alone, external forcing signals are detectable but are
not distinguishable from autocyclically produced signals.
Interestingly, there is no correlation between the percentage of
sediment preserved and the accuracy with which signals are
detectable in the preserved sediment: in some model realisations,
even with preservation as low as 40\%, the correct forcing signal
can be detected accurately while, conversely, sections with
preservation as high as 90\% can have poor signal preservation.
The reverse can also be true in other models. It is therefore
concluded that distinguishing allocyclic and autocyclic forcing
in shallow marine or peritidal carbonate successions is likely to
be extremely difficult except in cases of extraordinary
sedimentary preservation and dating accuracy.",
journal = "Sedimentary geology",
volume = "275-276",
number = 1,
pages = "79--92",
month = jul,
year = 2012,
keywords = "carbonate sedimentation,cyclicity,forward
modelling,preservation,spectral analysis",
issn = "0037-0738",
doi = "10.1016/j.sedgeo.2012.07.017"
}
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M."],"year":2012,"bibtype":"article","biburl":"https://raw.githubusercontent.com/EnvModellingGroup/EnvModellingGroup.github.io/master/publications.bib","bibdata":{"bibtype":"article","type":"article","title":"Preservation of forcing signals in shallow water carbonate sediments","author":[{"propositions":[],"lastnames":["Hill"],"firstnames":["Jon"],"suffixes":[]},{"propositions":[],"lastnames":["Wood"],"firstnames":["Rachel"],"suffixes":[]},{"propositions":[],"lastnames":["Curtis"],"firstnames":["Andrew"],"suffixes":[]},{"propositions":[],"lastnames":["Tetzlaff"],"firstnames":["Daniel","M."],"suffixes":[]}],"abstract":"No consensus has been reached on whether the metre-scale cycles that commonly occur in peritidal carbonates are predominately a product of external relative sea-level variations (allocycles) or an intrinsic property of carbonate production generated via the interaction of non-linear processes (autocycles). For any forcing signal such as eustatic sea-level change, to be detectable in stratigraphy its effects must be preserved. Here, a deterministic, three-dimensional geological process model is used to explore how such cycles are preserved in the geological record in the presence of autocyclic processes. Each simulation produced cycle thickness distributions that are statistically indistinguishable from a theoretical Poisson process, regardless of whether auto- or allo-cycles dominated. Spectral analysis of depositional time series constructed from idealised geological sections showed that all detectable signals occurred within the Milankovitch forcing frequency bands, even when no Milankovitch forcing was present. Thus, it is deduced that from any geological section alone, external forcing signals are detectable but are not distinguishable from autocyclically produced signals. Interestingly, there is no correlation between the percentage of sediment preserved and the accuracy with which signals are detectable in the preserved sediment: in some model realisations, even with preservation as low as 40%, the correct forcing signal can be detected accurately while, conversely, sections with preservation as high as 90% can have poor signal preservation. The reverse can also be true in other models. It is therefore concluded that distinguishing allocyclic and autocyclic forcing in shallow marine or peritidal carbonate successions is likely to be extremely difficult except in cases of extraordinary sedimentary preservation and dating accuracy.","journal":"Sedimentary geology","volume":"275-276","number":"1","pages":"79–92","month":"July","year":"2012","keywords":"carbonate sedimentation,cyclicity,forward modelling,preservation,spectral analysis","issn":"0037-0738","doi":"10.1016/j.sedgeo.2012.07.017","bibtex":"@ARTICLE{Hill2012-gg,\n title = \"{Preservation of forcing signals in shallow water carbonate\n sediments}\",\n author = \"Hill, Jon and Wood, Rachel and Curtis, Andrew and Tetzlaff,\n Daniel M.\",\n abstract = \"No consensus has been reached on whether the metre-scale cycles\n that commonly occur in peritidal carbonates are predominately a\n product of external relative sea-level variations (allocycles) or\n an intrinsic property of carbonate production generated via the\n interaction of non-linear processes (autocycles). For any forcing\n signal such as eustatic sea-level change, to be detectable in\n stratigraphy its effects must be preserved. Here, a\n deterministic, three-dimensional geological process model is used\n to explore how such cycles are preserved in the geological record\n in the presence of autocyclic processes. Each simulation produced\n cycle thickness distributions that are statistically\n indistinguishable from a theoretical Poisson process, regardless\n of whether auto- or allo-cycles dominated. Spectral analysis of\n depositional time series constructed from idealised geological\n sections showed that all detectable signals occurred within the\n Milankovitch forcing frequency bands, even when no Milankovitch\n forcing was present. Thus, it is deduced that from any geological\n section alone, external forcing signals are detectable but are\n not distinguishable from autocyclically produced signals.\n Interestingly, there is no correlation between the percentage of\n sediment preserved and the accuracy with which signals are\n detectable in the preserved sediment: in some model realisations,\n even with preservation as low as 40\\%, the correct forcing signal\n can be detected accurately while, conversely, sections with\n preservation as high as 90\\% can have poor signal preservation.\n The reverse can also be true in other models. It is therefore\n concluded that distinguishing allocyclic and autocyclic forcing\n in shallow marine or peritidal carbonate successions is likely to\n be extremely difficult except in cases of extraordinary\n sedimentary preservation and dating accuracy.\",\n journal = \"Sedimentary geology\",\n volume = \"275-276\",\n number = 1,\n pages = \"79--92\",\n month = jul,\n year = 2012,\n keywords = \"carbonate sedimentation,cyclicity,forward\n modelling,preservation,spectral analysis\",\n issn = \"0037-0738\",\n doi = \"10.1016/j.sedgeo.2012.07.017\"\n}\n\n","author_short":["Hill, J.","Wood, R.","Curtis, A.","Tetzlaff, D. 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