China
Africa
Explore chapters and articles related to this topic
Basin Analysis: A Synthesis
Published in Supriya Sengupta, Introduction to Sedimentology, 2017
Cross-beddings of various shapes and sizes are the commonest tools used for palaeocurrent analysis. The reliability of different types of cross-bedding for palaeocurrent interpretation has been discussed by High and Picard (1974). For a planar-tabular cross-bedding, palaeocurrent is indicated by the direction of inclination of the foreset, but random measurement of dips on the flanks, in the case of a trough type cross-bedding, might give misleading results. Such observations must be corrected, taking into consideration the plunge of the trough axis, to obtain the trough axial azimuth (Slingerland and Williams 1979).
From intrabasinal volcanism to far-field tectonics: causes of abrupt shifts in sediment provenance in the Devonian–Carboniferous Drummond Basin, Queensland
Published in Australian Journal of Earth Sciences, 2019
K. Sobczak, S. E. Bryan, C. R. Fielding, M. Corkeron
Paleocurrent directions measured from sedimentary structures in this study are presented in Figure 17, and data collection procedures are detailed in Appendix 3. The majority of readings were taken from the Cycles 2 and 3 sandstones and conglomerates, although four readings were obtained from the Llanarth Volcanic Member (St Ann’s Formation) of Cycle 1. Paleocurrent directions measured in the southernmost part of the basin indicate northerly (Telemon Formation at Snake Range NP, Mt Hall Formation at Foyle Park) to northeasterly (Telemon Formation at Foyle Park, Mt Hall Formation at Snake Range NP, and Raymond Formation at Mt Beaufort Anticline) sediment transport directions. Two datasets at the western edge of the Anakie Inlier, Withersfield (Mt Hall Formation) and Old Banchory (Star of Hope Formation), show some deviation from this general trend. A more bimodal distribution of opposing NW and SE trends was recorded at the Withersfield location, although the NW trend remains dominant and consistent with readings from elsewhere in the southern basin. More variable directions are shown for the Cycle 3 Star of Hope Formation in the central part of the basin (e.g. Old Banchory). In the central part of the basin (Narrien and Pebbly Creek anticlines, Figure 1), the paleoflow directions become more north/northwest oriented, potentially reflecting the basin axis, and are mostly consistent with the recordings of Olgers (1972). The general northerly trend continues up to Dawsonvale, north of which the paleocurrent patterns shift to more radial distributions, with the northernmost location (Dandenong) showing a prominent southerly trend.
Paleocurrent and paleowind direction reconstruction research progress and perspectives: a review
Published in Australian Journal of Earth Sciences, 2023
F. Y. Zhao, C. L. Hu, C. C. Han, Y. Q. Dong, Q. X. Yuan
Cross-bedding caused by water flow can directly reflect the hydrodynamic conditions at the time of sedimentation. The dip direction of the foreset of the cross-bedding is the paleocurrent direction (Du, 2018). Cross-bedding includes structures formed by unidirectional flow and bidirectional flow. Generally, the paleocurrent direction can be truly determined only from the cross-bedding formed by the unidirectional flow.