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GEOREF RECORD

Tubular tidalites; a biogenic sedimentary structure indicative of tidally influenced sedimentation

Murray K. Gingras and John-Paul Zonneveld
Tubular tidalites; a biogenic sedimentary structure indicative of tidally influenced sedimentation
Journal of Sedimentary Research (July 2015) 85 (7): 845-854

Abstract

The most conclusive evidence of tidal sedimentation consists of deposits that exhibit evidence of rhythmic sedimentation attributable to tidal cyclicity. Until now such deposits have been limited to physical sedimentary structures. Tubular tidalites, defined herein, are combined biogenic-physical sedimentary structures that provide compelling evidence for tidal mediation in sedimentary successions. These structures consist of rhythmically bedded alternating layers of fine-grained and coarse-grained laminae deposited within open framework burrows such as Arenicolites, Ophiomorpha, Palaeophycus, Psilonichnus, and Thalassinoides. Importantly, the open framework burrows represent natural sediment traps that potentially preserve depositional cycles that might be missing due to high levels of bioturbation in settings such as intertidal flats and lagoons. The interpretation of the burrow infills as being tidally modulated is tested and supported in three ways: using exponential smoothing of thickness data on burrow-infilling laminae to identify rhythmic trends in laminae thicknesses, visually fitting sinusoidal curves to the raw thickness distributions, and using Fast Fourier Transform analysis.Considering the morphology of tubular tidalites presented, the parameters that promote the occurrence of tubular tidalites include an open aperture, bimodal sediment availability, tidal influence in sedimentation, and low overall sedimentation rates. Tubular tidalites have been identified from tidally influenced successions in Mesozoic, Cenozoic, and modern deposits and provide evidence of tidal influence in sedimentary successions where other indicators may be ambiguous.


ISSN: 1527-1404
EISSN: 1938-3681
Serial Title: Journal of Sedimentary Research
Serial Volume: 85
Serial Issue: 7
Title: Tubular tidalites; a biogenic sedimentary structure indicative of tidally influenced sedimentation
Affiliation: University of Alberta, Department of Earth and Atmospheric Sciences, Edmonton, AB, Canada
Pages: 845-854
Published: 20150724
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 60
Accession Number: 2015-082159
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 201535
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