Potential for stratigraphic folding near ice-sheet centers / Edwin D. Waddington, John F. Bolzan, Richard B. Alley.

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100 1# ‡aWaddington, Edwin D.
245 10 ‡aPotential for stratigraphic folding near ice-sheet centers /‡cEdwin D. Waddington, John F. Bolzan, Richard B. Alley.
260 ## ‡a[S.l.] :‡b[s.n.],‡c2001.
300 ## ‡ap. 639-648 :‡bdiags.
500 ## ‡aJournal of Glaciology. Vol. 47(159) :639-648 (2001).
520 3# ‡aAddresses stratigraphic stability near to ice divides. Motivated by lack of agreement between deep portions of GISP2 and GRIP cores. Examines how one layer-disrupting process, folding, could operate on spatial scales that are small relative to the ice thickness. Notes that folding requires a transient source of disturbances or wrinkles in the otherwise steady state stratigraphy and an ice sheet flow field able to turn that wrinkle into a fold. Uses analytical models to approximate folding and flow. Derives stability fields, identifying regions in which wrinkles tend to overturn into recumbent folds and regions in which they tend to be stretched and flattened. Estimates upper limits to (a) the time taken for each unstable wrinkle to unfold, and (b) the distance ice travels in the unfolding process. Considers bedrock undulations and surface features such as sastrugi or drifts inadequate to form wrinkles. Argues that most are formed in situ by inhomogeneous deformation associated with spatial variability in rheological properties (viscosity and anisotropy). Discusses how such variability could arise. Discusses application to GISP2, GRIP, Dye3 and Siple Dome cores. Considers influences of distance from divide and divide migration on stratigraphic stability.
650 07 ‡a551.321.2 -- Snow and ice, methods of sampling, excavating, drilling, etc.‡2udc
650 07 ‡a622.14 -- Core sampling, ice and snow.‡2udc
650 07 ‡a551.324 -- Land ice.‡2udc
650 07 ‡a551.33 -- Glacial geology.‡2udc
650 07 ‡a519.673 -- Modelling.‡2udc
650 07 ‡aE7 -- Glaciology: glacial geology and ice ages.‡2local
651 #7 ‡a(*38) -- Greenland.‡2udc
651 #7 ‡a(*7) -- Antarctic regions.‡2udc
651 #7 ‡a(*767.5) -- Siple Coast.‡2udc
700 1# ‡aBolzan, John F.
700 1# ‡aAlley, Richard B.
773 0# ‡7nnas ‡tJournal of Glaciology. ‡gVol. 47(159) (2001) ‡wSPRI-20534
917 ## ‡aUnenhanced record from Muscat, imported 2019
948 3# ‡a20231207