Further cryostratigraphic observations in the CRREL, permafrost tunnel, Fox, Alaska

Auteurs :
BRAY, M.T.
FRENCH, H.M.
SHUR, Y.

Description :
Cryostratigraphic mapping in the main shaft of the CRREL tunnel indicates secondary modification of original Pleistocene-age syngenetic permafrost. Layered, lenticular-layered and micro-lenticular cryostructures within undisturbed silt characterise the syngenetic permafrost. Thawed and refrozen deposits are characterised by massive and reticulate-chaotic cryostructures. The micro-morphology of typical cryostructures, as observed through an environmental scanning electron microscope (ESEM), is described. It is inferred that preferential cryogenic modification has occurred due to fluvio-thermal erosion operating along ice wedges. Soil and ice pseudomorphs are the manifestation of this process.


Type de document :
Article de périodique

Source :
Permafrost and periglacial processes, issn : 1045-6740, 2006, vol. 17, n°. 3, p. 233-243, nombre de pages : 11, Collation : Illustration, Références bibliographiques : 18 ref.

Date :
2006

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley