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- W2017683416 abstract "The Late Carboniferous to Early Permian glacigene Dwyka Group has at its top three types of transitions from diamictite to postglacial mudrock in the southern Karoo. The type 1 transition sequence consists of clast-poor carbonate-rich diamictite having a sharp contact with the overlying mudrocks. This diamicton accumulated slowly by rain-out and sediment gravity flow processes. During sedimentation the polar ice front was stabilised by a possible ice shelf. Collapse of the ice shelf caused rapid ice margin retreat. The type 2 transition sequence consists of clast-poor diamictite with sandstone bodies overlain by mudrock with ice-rafted debris or thin interbedded debris-flow diamictites. Deposition of the diamictite facies occurred during oscillations of a subpolar ice front with short stable periods of surface melting of the ice resulting in the formation of small subaqueous outwash fans. The type 3 transition sequence consists of bouldery diamictite interbedded with massive or sandstone-bearing diamictite overlain by mudrock with ice-rafted debris or thin interbedded debris-flow diamictites. The sequence represents highly unstable ice front conditions and fluctuating sea-levels with periods of rapid deposition probably by collapsing ice streams. Climatic conditions may have alternated between polar and subpolar. The type 1 transition sequence is predominant in the western part and the type 3 sequence in the eastern part of the Karoo Basin. Long-term controls on deglaciation was climatic warming as Gondwana drifted over the pole as well as changes in land-sea configuration. Superimposed on these were local controls such as relative sea-level changes, presence of deformable substrate and meltwater production." @default.
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- W2017683416 date "1996-10-01" @default.
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- W2017683416 title "Controls on Early Permian shelf deglaciation in the Karoo Basin of South Africa" @default.
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- W2017683416 doi "https://doi.org/10.1016/s0031-0182(96)00027-2" @default.
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