Some sources of systematic variation in the main head deposits of southwest England
DOI:
https://doi.org/10.26485/BP/1982/29/8Keywords:
colluvium, solifluction, lithology, textural features of deposits, local factorsAbstract
Studies of colluvial deposits in southwest England revealed significant variability in their physical properties. Analysis of 84 samples allowed for the assessment of the influence of source material (bedrock lithology) and transport processes (mainly solifluction) on sediment characteristics such as mean grain size, skewness, sorting, matrix colour, roundness, and clast orientation. The results showed that lithology significantly affects sediment properties, while at the local scale, factors such as transport distance and slope aspect are dominant. These findings indicate a complex formation process of colluvial deposits, governed by both lithological conditions and dynamic periglacial processes.
References
Benedict, J. B., 1970 - Downslope soil movement in a Colorado alpine region: rates, process and climatic significance, Arctic and Alpine Research, 2; p. 165-226.
Dutkiewicz, L., 1967 - The distribution of periglacial phenomena in northwest Sörkapp, Spitsbergen, Biul. Peryglacjalny, 16; p. 37-83.
Harris, C., 1972 - Processes of soil movement in turf-banked solifluction lobes, Okstindan, northern Norway. In: R. J. Price, D. E. Sugden, (compilers) - Polar Geomorphology. Inst. Brit. Geogr., Spec. Pub., 4; p. 155-174.
Jahn, A., 1967 - Some features of mass movement on Spitsbergen slopes. Geogr. Ann., 49(A); p. 312-325.
Krumbein, W. C., Tisdel, W. F., 1940 - Size distribution of source rocks of sediment. Amer. Jour. Sci., 238; p. 296-306.
Mottershead, D. N., 1971 - An investigation of solifluction deposits in southwest England. Unpubl. Ph. D. thesis, Univ. London; 305 p.
Mottershead, D. N., 1976 - Quantitative aspects of periglacial slope deposits in southwest England. Biul. Peryglacjalny, 25; p. 35-57.
Munsell Soil Colour Chart - 1954. 2nd Edition, Baltimore.
Washburn, A. L., 1967 - Instrumental observations of mass wasting in the Mesters Vig district northeast Greenland. Medd. om. Grønland, 166; 318 p.
