Geology Reference
In-Depth Information
(A)
(B)
Figure 9.3.
Rectilinear debris-mantled slopes, Antarctica. (A) Richter denudation slope formed in
metagranites and high-grade metamorphic rocks, Terra Nova Bay, Northern Victoria Land.
(B) Schematic illustration of debris-mantled rectilinear slopes in Sor Rondane Mountains, according
to Iwata (1987) showing (1) time duration for slope formation, (2) surface processes acting on the
slopes, (3) bedrock structures, and (4) assumed balance between debris supply and debris removal.
These slope forms have been reported from several localities (Büdel, 1960; Jahn, 1975,
pp. 163-165; Pissart, 1966a; Rudberg, 1963). While the lack of detailed observations
makes their interpretation diffi cult, several generalizations are possible.
First, convex and concave slopes usually form upon predominantly soft, unconsolidated
bedrocks. For the most part, these form lowland, as opposed to upland, terrain. According
