Influence of near-surface stratigraphy on coastal landslides at Sleeping Bear Dunes National Lakeshore, Lake Michigan, USA
Barnhardt, Walter A.
Jaffe, Bruce E.
Kayen, Robert E.
Cochrane, Guy R.
MetadataShow full item record
KeywordLake-level change; Sequence stratigraphy; Paleochannel; Groundwater; Seismic reflection; Ground-penetrating radar
Lake-level change and landslides are primary controls on the development of coastal environments along the coast of northeastern Lake Michigan. The late Quaternary geology of Sleeping Bear Dunes National Lakeshore was examined with high-resolution seismic reflection profiles, ground-penetrating radar (GPR), and boreholes. Based on sequence-stratigraphic principles, this study recognizes ten stratigraphic units and three major unconformities that were formed by late Pleistocene glaciation and postglacial lake-level changes. Locally high sediment supply, and reworking by two regressions and a transgression have produced a complex stratigraphy that is prone to episodic failure. In 1995, a large landslide deposited approximately 1 million m3 of sediment on the lake floor. The highly deformed landslide deposits, up to 18 m thick, extend 3–4 km offshore and unconformably overlie well-stratified glacial and lacustrine sediment. The landslide-prone bluff is underlain by channel-fill deposits that are oriented nearly perpendicular to the shoreline. The paleochannels are at least 10 m deep and 400 m wide and probably represent stream incision during a lake-level lowstand about 10.3 ka B.P. The channels filled with sediment during the subsequent transgression and lake-level highstand, which climaxed about 4.5 ka B.P. As lake level fell from the highstand, the formation of beach ridges and sand dunes sealed off the channel and isolated a small inland lake (Glen Lake), which lies 5 m above the level of Lake Michigan and may be a source of piped groundwater. Our hypothesis is that the paleochannels act as conduits for pore water flow, and thereby locally reduce soil strength and promote slope failure.
This paper is not subject to U.S. copyright. The definitive version was published in Journal of Coastal Research 20 (2004): 510-522, doi:10.2112/1551-5036(2004)020[0510:IONSOC]2.0.CO;2.
Showing items related by title, author, creator and subject.
Berggren, William A.; Alegret, Laia; Aubry, Marie-Pierre; Cramer, Ben S.; Dupuis, Christian; Goolaerts, Sijn; Kent, Dennis V.; King, Christopher; Knox, Robert W. O'B.; Obaidalla, Nageh; Ortiz, Silvia; Ouda, Khaled A. K.; Abdel-Sabour, Ayman; Salem, Rehab; Senosy, Mahmoud M.; Soliman, Mamdouh F.; Soliman, Ali (Austrian Geological Society, 2012)The Dababiya corehole was drilled in the Dababiya Quarry (Upper Nile Valley, Egypt), adjacent to the GSSP for the Paleocene/ Eocene boundary, to a total depth of 140 m and bottomed in the lower Maastrichtian Globotruncana ...
Geomorphic and stratigraphic evidence for an unusual tsunami or storm a few centuries ago at Anegada, British Virgin Islands Atwater, Brian F.; ten Brink, Uri S.; Buckley, Mark; Halley, Robert S.; Jaffe, Bruce E.; Lopez-Venegas, Alberto M.; Reinhardt, Eduard G.; Tuttle, Maritia P.; Watt, Steve; Wei, Yong (Springer, 2010-10-26)Waters from the Atlantic Ocean washed southward across parts of Anegada, east-northeast of Puerto Rico, during a singular event a few centuries ago. The overwash, after crossing a fringing coral reef and 1.5 km of shallow ...
Seabed fluid expulsion along the upper slope and outer shelf of the U.S. Atlantic continental margin Brothers, Daniel S.; Ruppel, Carolyn D.; Kluesner, J. W.; ten Brink, Uri S.; Chaytor, Jason D.; Hill, Jenna C.; Andrews, Brian D.; Flores, Claudia H. (John Wiley & Sons, 2014-01-08)Identifying the spatial distribution of seabed fluid expulsion features is crucial for understanding the substrate plumbing system of any continental margin. A 1100 km stretch of the U.S. Atlantic margin contains more than ...