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

Daan Beelen, Christopher Jackson, Stefano Patruno, David Hodgson, João Alexandre

Research output: Working paperPreprint

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.
Original languageEnglish
DOIs
Publication statusPublished - 23 May 2018

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