You are not currently logged in.
Access your personal account or get JSTOR access through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Paraglacial Slope Adjustment and Resedimentation Following Recent Glacier Retreat, Fåbergstølsdalen, Norway
Colin K. Ballantyne and Douglas I. Benn
Arctic and Alpine Research
Vol. 26, No. 3 (Aug., 1994), pp. 255-269
Published by: INSTAAR, University of Colorado
Stable URL: http://www.jstor.org/stable/1551938
Page Count: 15
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
Withdrawal of glacier ice from upper Fåbergstølsdalen after A.D. 1930 has exposed steep drift-covered slopes on the north side of the valley. Since 1943 these have experienced radical transformation into gullied badlands, with reworked sediments being redeposited on the valley floor as coalescing debris cones. Gully erosion has exposed wide areas of bedrock, and has extended upslope outside the limit of Little Ice Age (18th century A.D.) glacier advance. Over much of the gullied area, ground surface lowering has been 2.5 to 4.7 m, representing a minimum erosion rate of 50 to 100 mm yr-1, and average gradients have been reduced by 5°. The principal agent of sediment reworking is debris flow activity, in part triggered by rapid snowmelt at gully heads. The eroded sediments consist of Little Ice Age till overlying Preboreal (ca. 9 ka) paraglacial deposits, and a cycle of alternating glacial and paraglacial sedimentation is inferred, the former accompanying glacier advance, the latter following glacier retreat. Paraglacial debris flow deposits inherit many of the sedimentological characteristics of the parent till, but may be distinguished on structural grounds and by preferred clast orientation. The rapidity of landscape change in upper Fåbergstølsdalen implies that extensive paraglacial modification of recently deglaciated terrain may occur over a timescale of decades rather than centuries.