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Response of weathering and erosion to the intense tectonic uplift of the South African Plateau during the Late Cretaceous: Preliminary insights.

Abstract : During the Late Cretaceous the South African Plateau experienced a period of uneven tectonic uplift. It started during the Turonian with an early pulse in the eastern margin, which increased the sediment accumulation rates in the western side, especially in the Orange and Cape basins. This was followed by a late uplift stage in the western margin during the Campanian, which similarly increased the sediment accumulation rates in the eastern side, particularly in the Transkei and Durban Basins. This occurred within a greenhouse climate and coincided with a marked global climate cooling during the Late Cretaceous. Sediment budget calculations have been performed for this system, but quantitative constrains on the long-term response of the denudation processes to this tectonic event and climatic variations remain unsolved. In this study, we combine two geochemical techniques to determine the intensity of chemical weathering and physical erosion. We use a new proxy of chemical weathering intensity, the ΔHf based on coupled Lu-Hf and Sm-Nd isotopic systems in clay fractions [1]. This technique is joint with X-ray Diffraction to determine the concomitant evolution of clay mineralogical assemblages thus tracking the progress of physical erosion. Both methods are applied on sediments from DSDP sites 361 and 249 (Fig. 1). This new data set will be combined with published sediment budget [2] and climate records to discuss the links between uplift, margin denudation, chemical weathering and how they impact the accumulation rates of sediments in the nearby oceanic basins.
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https://hal-insu.archives-ouvertes.fr/insu-03517163
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Submitted on : Friday, January 7, 2022 - 4:08:00 PM
Last modification on : Thursday, June 2, 2022 - 2:48:17 PM

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Esteban Gaitan, Emmanuelle Pucéat, Pierre Pellenard, François Guillocheau, Cecile Robin, et al.. Response of weathering and erosion to the intense tectonic uplift of the South African Plateau during the Late Cretaceous: Preliminary insights.. Goldschmidt 2021, Jul 2021, Virtual, France. ⟨10.7185/gold2021.6836⟩. ⟨insu-03517163⟩

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