Ice sheet deformation in the Table Mountain group, Western Cape

[摘要] ENGLISH ABSTRACT:The Lower Paleozoic glaciogenic sediments of the Table Mountain Groupare interpreted as the result of two ice sheet advances into the active TableMountain embayment. Subglacial deformation during the first advancegave rise to the Fold Zone. Macro- and micro-fabric data of deformed andundeformed sediments provide valuable constraints on the interpretation ofthe rheology of sediment transport media and the contemporaneously deformedsediments.It is shown that the structural characteristics of the Fold Zone are consistentwith the progressive infill of the Table Mountain embayment by an ice sheet.The distribution, size and geometry of the folds are dependent on the effectiveload of the ice sheet and the type and direction of ice sheet flow; compressiveand extending flow resulted in pure shear and simple shear deformationrespectively.

[发布机构] Stellenbosch University