Ross Sea Region Soil Sites
680000
680
24-Dec-1992
IBC, GGC
Vanda Station, Wright Valley at the eastern end of Lake Vanda
| assessment of environmental impacts from past human activities at Vanda Station; sampled for indications of |
| contaminations from greywater and urine disposal |
not recorded
No
166.7500
-75.8333
75deg 50.0'S
-166deg -45.0'E
on a slope just northwest of the Vanda Station buildings; 15m from the main building and 10m from the generator building; approximately 6.5m downslope from site 679
16
NW
93
cf. Notes for GEOLAND below
(16o)
5
1.8
16
0.6
23
-1.5
30
-2.7
46
-2.5
| xerous; the soil surface is occasionally moistened by summer snowfall; a site for previous |
| disposal of fluids |
-20
central mountain
fractured, flaggy & in situ, granodiorite with granular sand accumulations in cracks bet. angular, fragmented boulder sized clasts; soil base is on ice cemented frozn grnd which may have formed from capillary movement of water from rising Lake Vanda
(-20 sunny conditions)
| SURFACE WEATHERING or |
| SURFACE FEATURES |
surface materials are angular and unstained; much surface loose and probably recent wind-blown sand
the upper part of the slope has been disturbed by base activities and was a disposal site for greywaters and urine, which may have seeped downslope
680a 2-0cm
101
surface platy cobbles and very loose recent wind blown sand
102
rock particles angular and unstained,
680b 0-4cm
201
pale olive to light yellowish brown (5Y 6/3-2.5Y 6/4) bouldery sandy gravel
202
loose to weakly cohesive but with some brown (10YR 5/3) organic stained aggregates
203
some foreign particles
204
680c 4-25cm
301
light yellowish brown (2.5Y 6/4) bouldery sand
302
loose
303
rock is platy disaggregated granodiorite with the sand fraction filling the fissures
304
indistinct boundary,
680d 25-45cm
401
light yellowish brown (2.5Y 6/4) bouldery sand
402
sand is loose between interlocked boulders
403
sharp boundary,
680e 45-50cm
501
light yellowish brown (2.5Y 6/4) bouldery sand
502
very hard and ice cemented
503
boulders are angular fragmented bedrock with sand filling the fissures.
yes
a,b,c,d
ice-cemented
26
1
Geoland
| the rocks of the area are granodiorites that have been cut with lamprophyre dykes and form a strongly undulating ridge and gully topography as a result of ice |
| over riding from down-valley and up-valley glaciations and to a lesser extent, subaerial weathering; at this site, the rock is fractured granodiorite; subsequent to |
| glaciation, the terrain has been subjected to drowning and emergence from fluctuating water levels from Lake Vanda with some sorting or resorting of surficial |
| materials |
| Soluble Salt |
| Concentration |
68000001
680a
2-0cm
-2
0
0.20
none
68000002
680b
0-4cm
0
4
0.30
none
68000003
680c
4-25cm
4
25
0.30
none
68000004
680d
25-45cm
25
45
0.20
none
68000005
680e
45-50cm
45
50
7.10
none
68000001
71.00
0.20
68000002
64.00
0.30
68000003
91.00
0.30
68000004
51.00
7.00
68000001
7.00
0.25
0.67
0.15
0.07
0.09
0.20
0.41
0.01
68000002
8.40
0.18
0.68
0.15
0.07
0.09
0.08
0.39
0.01
68000003
8.70
0.12
0.40
0.07
0.03
0.04
0.05
0.16
0.00
68000004
8.40
0.11
0.31
0.06
0.02
0.04
0.01
0.21
0.00
68000001
68000002
68000003
68000004
12-Dec-2005
Page 638 of 896
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