Sedimentary processes and facies on a high-latitude passive continental margin, Wilkes Land, East Antarctica
Published:January 01, 2019
Sandra Passchier, Daniel J. Ciarletta, Victor Henao, Vicky Sekkas, 2019. "Sedimentary processes and facies on a high-latitude passive continental margin, Wilkes Land, East Antarctica", Glaciated Margins: The Sedimentary and Geophysical Archive, D.P. Le Heron, K.A. Hogan, E.R. Phillips, M. Huuse, M.E. Busfield, A.G.C. Graham
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The impact of high-latitude physical processes on the sedimentary geology of a passive continental margin is addressed using a sediment record from the Wilkes Land margin of Antarctica. We present sequence stratigraphic models based on analytical data and genetic interpretations of sedimentary facies assemblages observed in drill cores collected by the Integrated Ocean Drilling Program. The examination of drill cores within a previously published seismostratigraphic context enhances the resolution of the sequence stratigraphic interpretations. Weaker tidal forcing, a stronger Coriolis effect and more pronounced seasonality are some of the physical processes that affect erosion and sedimentation at high latitudes, even if ice sheets are absent. In addition, the presence of an ice sheet affects erosion rates, crustal motion, and atmospheric and ocean circulation, with major implications for the development of depositional systems. As a result, high-latitude, ice-covered, passive margins show distinct sedimentary facies associations and their interpretation requires the application of a different suite of sequence stratigraphic models from those applied to low-latitude continental margins.
Supplementary material: A supplementary data file is available at http://doi.org/10.6084/m9.figshare.c.4031218.v1
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Glaciated Margins: The Sedimentary and Geophysical Archive
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Understanding the sedimentary and geophysical archive of glaciated margins is a complex task that requires integration and analysis of disparate sedimentological and geophysical data. Their analysis is vital for understanding the dynamics of past ice sheets and how they interact with their neighbouring marine basins, on timescales that cannot be captured by observations of the cryosphere today. As resources, sediments deposited on the inner margins of glaciated shelves also exhibit resource potential where more sand-dominated systems occur, acting as reservoirs for both hydrocarbons and water. This book surveys the full gamut of glaciated margins, from deep time (Neoproterozoic, Ordovician and Carboniferous–Permian) to modern high-latitude margins in Canada and Antarctica. This collection of papers is the first attempt to deliberately do this, allowing not only the similarities and differences between modern and ancient glaciated margins to be explored, but also the wide spectrum of their mechanisms of investigation to be probed. Together, these papers offer a high-resolution, spatially and temporally diverse blueprint of the depositional processes, ice sheet dynamics, and basin architectures of the world’s former glaciated margins; a vital resource in advancing understanding of our present and future marine-terminating ice sheet margins.