A minimal lag time and continuous sedimentation in alpine lakes near Mount Rainier, Cascade Range, Washington, USA |
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| Authors: | Jan T Heine |
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| Institution: | (1) Department of Geological Sciences, University of Washington, Box 351310, Seattle, WA 98195, USA |
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| Abstract: | Alpine lakes near Mount Rainier are dammed by late-glacial moraines. Multiple cores show that sedimentation started less than 350 years after deglaciation. Numerous tephra layers provide excellent marker horizons that allow comparison of the stratigraphy without the errors associated with radiocarbon dating. Cores from different locations within a lake display the same stratigraphy and basal sediments. Core location therefore is not crucial to obtaining the oldest sediments. Continuous sedimentation in all cores is interpreted as evidence for stable lake levels throughout the Holocene. The cores are valuable tools for reconstruction and dating of glacier advances and volcanic activity. |
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| Keywords: | alpine lakes cores deglaciation sedimentation lag time |
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