Ross Sea Region Soil Sites
713000
713
6-Jan-1993
IBC, GGC
Cape Roberts, at the north western end of McMurdo Sound and at the northern end of the Wilson Piedmont Glacier
Cape Roberts soil examination for the CEE for the proposed McMurdo Sound Stratigraphic Drilling project
not recorded
CS Pro & Lscp
No
163.1830
-77.5000
77deg 30.0'S
-163deg -11.0'E
The site is located about 75m to the west the NZAP huts on a raised boulder gravel beach surface, about 25m west of a low rock outcrop ridge
0
2
cf. Notes for GEOLAND below
oceanic subxerous
-17
coastal Antarctic
unweathered bouldery gravel beach deposits from dominantly granodiorite and gneissic rocks
patches of algae and some moss near adjacent rock outcrops
SURFACE WEATHERING or |
SURFACE FEATURES |
pavement of boulders and pebbles is weakly developed with subrounded clasts; some have slight to moderate staining
nil at site
713a 3-0cm
101
pebble and boulder pavement
102
subrounded with some clasts weakly stained
713b 0-4cm
201
pale olive (5Y 6/3) sandy pebble gravel
202
weakly cohesive at the surface
203
rock particles subrounded to subangular
204
distinct boundary,
713c 4-25cm
301
pale olive (5Y 6/3) bouldery gravel
302
loose
303
coarser clasts are rounded to subrounded and smaller clasts subangular to subrounded
304
some weak patchy oxide coatings on some clasts
305
indistinct boundary,
713d 25-40cm
401
pale olive (5Y 6/3) bouldery gravel
402
loose
403
rock particles rounded to subangular and unstained
404
distinct boundary,
713e 40-55cm
501
pale olive (5Y 6/3) bouldery coarse sand
502
moist
503
cohesive
504
rock particles subrounded to subangular
505
sharp boundary,
713f 55-62
601
pale olive (5Y 6/3) bouldery coarse sand
602
very hard
603
ice cemented.
yes
hard ice-cemented
55
1
Geoland
The rocks of the area are granodiorites that have been largely planed by ice movement then subject to some weathering processes by beach and wave action; |
isostatic uplift has resulted in beach terracing with the raised beaches comprising mainly coarse boulder gravels; some schist/gneiss and occasional dolerite clasts |
in the beach gravels are indicative of residual tills; bedrock outcrops widely forming an in situ large bouldery surface; fine gravel deposits occupy a small area |
only |
Soluble Salt |
Concentration |
71300001
713a
3-0cm
-3
0
0.70
none
71300002
713b
0-4cm
0
4
0.50
none
71300003
713c
4-25cm
4
25
0.30
none
71300004
713d
25-40cm
25
40
0.20
none
71300005
713e
40-55cm
40
55
4.80
none
71300006
713f
55-62cm
55
62
8.80
none
71300001
0.70
71300002
0.50
71300003
0.30
71300004
0.20
71300005
4.80
71300006
8.80
71300001
71300002
71300003
71300004
71300005
71300006
71300001
71300002
71300003
71300004
71300005
71300006
12-Dec-2005
Page 671 of 896
713