New palaeocurrent analysis approach from two-dimensional trough cross-strata using photographs and anisotropy of magnetic susceptibility

Palaeocurrent analysis is vital for basin analysis and helps in the interpretation of depositional environments (along-slope or downslope). For that, it is crucial to have multiple measuring methods at hand to apply palaeocurrent analysis with a wide range of different datasets (outcrops, cores and photographs). Here, two relatively underexploited palaeocurrent measurement techniques are assessed when applied to trough cross-stratification observed in the Arenazzolo Formation at Eraclea Minoa (Sicily). The first technique is a novel design of a qualitative approach to infer palaeocurrent directions from photographs of two-dimensional sedimentary structures. The second technique involves measurements of the anisotropy of magnetic susceptibility from drilled samples. A broad agreement, with overlapping uncertainty boundaries, is observed between results from both techniques. This agreement validates the use of trough cross-strata to infer palaeocurrent directions. Moreover, the addition of photographs improves reproducibility and prevents a bias towards the best-exposed troughs. The application of both techniques to outcrops and sedimentary cores provides new opportunities for palaeocurrent analysis in any type of sedimentary environment. (A and B) Rose diagrams indicating approximated palaeocurrent directions from two-dimensional trough cross-bedded cosets. Trough cross-stratification is denoted as TXB. (C) AMS derived palaeocurrent directions after interpreting Kmax current-parallel with grain-long axes. The range is defined by the 95% confidence ellipse.image