Ross Sea Region Soil Sites
357000
357
8-Dec-1972
IBC, GGC
Wright Valley, McMurdo Dry Valley region, near Lake Vanda
Soil weathering examination
USGS 1:50,000 Antarctic Topo. Ser. Lake Vanda Quadrangle
B&W Pro
No
161.2000
-77.5667
77deg 34.0'S
-161deg -12.0'E
On the floor of Wright Valley, in the South Fork at Don Juan Pond; the sample site is near the eastern side; a flat dry surface with occasional medium boulders
0
Nil
175
Don Juan Pond is a saline calcium chloride enriched hollow which varies in wetness; at this site, a pebble to boulder surface cover overlies laminated sandy sediment; this may |
represent ice fluctuations and ice marginal sedimentation activity |
(0o)
Soil surface dry
-23
Central Mountain
Thin gravelly drift over fluvially sorted sediment
Nil observed
Nil
SURFACE WEATHERING or |
SURFACE FEATURES |
A well developed pebble and cobble pavement with occasional boulders, clasts resting on sandy sediment; the boulders are rounded; weakly ventiform |
surface |
Nil at site; the area was examined previously by many people
357 2-0cm
101
surface pebbles and granular sand
102
rock particles subrounded and forming a well developed pavement
103
thin diffuse surface salts,
357a 0-7cm
201
olive (5Y 5/3 slightly moist) silty quartzofeldspathic sand
202
profuse diffuse salts
203
firmly cohesive
204
distinct boundary,
357b 7-15cm
301
light olive grey to light grey (5Y 6/2 - 7/2) silty quartzofeldspaathic sand
302
weakly to moderately cohesive
303
indistinct boundary,
357c 15-30cm
401
light grey (5Y 7/2) silty quartzofeldspathic sand
402
moderately cohesive
403
distinctly bedded
404
distinct boundary, on very firm partly frozen silty sand
Yes
a,b,c
Hard ice-cemented
30
(30cm)
Soluble Salt |
Concentration |
35700001
88.00
1.40
1.10
5.90
28.50
39.00
18.70
4.90
0.24
35700002
100.00
0.00
0.10
31.60
45.20
15.80
4.30
3.00
0.13
35700003
100.00
0.10
2.50
45.00
35.60
10.80
4.00
1.80
0.10
35700001
7.40
36.00
16.30
70.00
3.20
0.77
215.00
4.37
0.17
35700002
7.60
3.20
9.70
5.60
0.40
0.01
18.50
0.64
0.07
35700003
7.80
2.50
8.30
5.25
0.20
0.01
12.10
0.44
0.05
35700001
25
75
35700002
15
10
40
15
20
35700003
50
50
12-Dec-2005
Page 314 of 896
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