The effects of differential compaction on clinothem geometries and shelf-edge trajectories

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Authors

Daan Beelen, Christopher Aiden-Lee Jackson , Stefano Patruno, David M Hodgson, João Trabucho Alexandre

Abstract

The geometry of basin margin strata documents changes in water depth, slope steepness, and sedimentary facies distributions. Their stacking patterns are widely used to define shelf-edge trajectories, which reflect long-term variations in sediment supply and relative sea level change. Here, we present a new method to reconstruct the geometries and trajectories of clinoform-bearing basin￾margin successions. Our sequential decompaction technique explicitly accounts for down-dip lithology
variations, which are inherent to basin-margin stratigraphy. Our case studies show that preferential compaction of distal, fine-grained foresets and bottomsets results in a vertical extension of basin margin strata and a basinward rotation of the original shelf-edge trajectory. We discuss the implications these effects have for sea level reconstructions and for predicting the timing of sediment transfer to the basin
floor.

DOI

https://doi.org/10.31223/osf.io/8a93m

Subjects

Earth Sciences, Geology, Physical Sciences and Mathematics, Sedimentology, Stratigraphy

Keywords

trajectory analysis, clinoform, clinothem, decompaction, sea-level change, shelf-edge trajectory

Dates

Published: 2018-05-23 11:12

Last Updated: 2019-08-19 23:17

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License

CC BY Attribution 4.0 International

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