Scratching the surface: Footprint of a late Carboniferous ice sheet

Daniel Le Heron, Pierre Dietrich, Marie Busfield, Christoph Kettler, Sarah Bermanschlager, Bernhard Grasemann

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

15 Dyfyniadau(SciVal)
233 Wedi eu Llwytho i Lawr (Pure)

Crynodeb

Field observations in conjunction with aerial images from an unmanned aerial vehicle were used to create the first map of a glacial unconformity underlying the late Carboniferous Dwyka Group of South Africa. Crosscutting relationships reveal that the glacial unconformity at Oorlogskloof, in which flutes, grooves, and striae were ploughed into unconsolidated sand, formed in a three-phased process charting a periodic shift in the locus of subglacial erosion. The unconformity formed by a periodically decoupled ice sheet in a probable tidewater setting. This model contrasts with earlier views that the structures simply record progressive ice-margin liftoff during transgression, and they provide unique insight into the complex temporal development of a 300 Ma subglacial environment.
Iaith wreiddiolSaesneg
Tudalennau (o-i)1034-1038
Nifer y tudalennau5
CyfnodolynGeology
Cyfrol47
Rhif cyhoeddi11
Dyddiad ar-lein cynnar23 Medi 2019
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - 01 Tach 2019

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