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Journal of the Geological Society; 2000; v. 157; issue.3; p. 513-516
© 2000 Geological Society of London

Special

Death of a sand sea: an active aeolian erg systematically buried by the Etendeka flood basalts of NW Namibia

D. A. JERRAM1, N. P. MOUNTNEY2, J. A. HOWELL3, D. LONG4 & H. STOLLHOFEN5

1 Department of Geological Sciences, University of Durham, South Road, Durham DH1 3LE (e-mail D. A. Jerram{at}dur.ac.uk).
2 Department of Earth Sciences, Keele University, Keele, Staffordshire ST5 5BG, UK
3 Department of Earth Sciences, University of Liverpool, Liverpool L69 3BX, UK
4 Enterprise Oil plc, Herbert Park Lane, Dublin 4, Republic of Ireland
5 Institut für Geologie, Universität Würzburg, 97070 Würzburg, Germany

Scientific editing by Nick Rogers.

Here we report on a ‘fossilized’ sand sea that was progressively engulfed by the basal Etendeka flood basalts in NW Namibia. Preserved relict aeolian landforms include transverse barchanoid dunes and isolated barchan dunes. Present-day preferential erosion of the lava flows exhumes relict aeolian bedforms preserved in the position in which they were migrating at the time of burial (c. 133 Ma). A passive eruption style of inflated pahoehoe flows has preserved the bedforms without significant deformation. The sediment interlayers record a decrease in sand supply and a change in palaeowind direction, which may have been driven by the ongoing break-up of west Gondwana, or may be a direct result of the widespread volcanism itself.


Keywords: Namibia, Etendeka, flood basalts, aeolian features.




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