Ross Sea Region Soil Sites
757000
757
13-Jan-1994
IBC,GGC,MRB,DSS
Wright Valley, on the northern side opposite Vanda Station
| Soil moisture and permafrost characterisation; undisturbed site for geochemical and soil contamination |
| reference characterisation |
not recorded
CS Lscp & Pro
No
161.6580
-77.5183
77deg 31.1'S
-161deg -39.5'E
cf. Notes for DESCR below
9
S
150
cf. Notes for GEOLAND below
(9o)
Xerous; dry with no identifiable source of free water
-24
Central Mountain
Stratified weakly to moderately sorted fan sediments over old sandy silty till
None observed
Nil at site but some broadly spaced sand filled cracks nearby
| SURFACE WEATHERING or |
| SURFACE FEATURES |
A pavement of mainly angular to subangular pebbles, some very weakly ventiform and with negligible surface staining; no surface salts visible
Nil
757a 2-0cm
101
surface pavement of small pebbles and granules
102
mostly subangular and unstained,
757b 0-14cm
201
greyish brown (10YR 5/2) pebbly to granular gravelly sand
202
weakly cohesive
203
rock particles subangular and unstained
204
distinct boundary,
757c 14-25cm
301
light grey (10YR 7/2) cobbly gravelly sand
302
moderately cohesive and moderately developed vesicular structure
303
rock particles subangular to subrounded and unstained
304
sharp boundary
757d 25-45cm
401
light brownish grey (10YR 6/2) pebbly granular sand
402
weakly cohesive
403
weak sedimentary layering
404
rock particles subangular and unstained
405
sharp boundary,
757e 45-74cm
501
pale yellow to light yellowish brown (2.5Y 7/4-6/4) sandy pebble and cobble gravel
502
moderately to strongly cohesive
503
rock particles subangular to rounded, some with weak staining
504
sharp boundary
505
757f 74-100cm
601
light brownish grey (2.5Y 6/2) bouldery silty to sandy gravel
602
moderately cohesive
603
| rock particles are mainly subangular to subrounded and unstained but the upper part of the horizon has some |
| partly oxidised subrounded clasts (cont.) |
604
| rock particles..clasts with small strong brown (7.5YR 5/8) oxidised fine earth patches and is probably a thin |
| paleosol, on light brownish grey till |
Yes (IGNS)
a,b,c,d,e,f
Dry frozen, loose
0
1
Descr
| North eastern end of Lake Vanda approximately 1.1km north northeast of Vanda Station just above the benchmark marking the uppermost recognised old lake |
| bench level; the surface is an even, broadly sloping surface on the western side of a fan which merges with the lake benches |
Geoland
| The rocks of the valley side are granodiorites cut by lamprophyre dykes and intruded with dolerite; old compact silty till, including Peleus or Jason Till, and |
| younger up-valley coarser tills with a variety of basement rock types included, mantle the valley sides; these deposits and the surface features have been weakly |
| modified by fan detritus from intermittent low energy flows originating from gullies from the Olympus Range; slopes below the site have been modified by |
| wave action during times of higher lake levels; the fan sediments are thin and generally form a thin veneer, weakly stratified, poorly sorted and generally only |
| form a thin (< 50cm) deposit |
| Soluble Salt |
| Concentration |
75700001
757a
2-0cm
-2
0
16.00
0.17
none
75700002
757b
0-14cm
0
14
78.00
0.40
none
75700003
757c
14-25cm
14
25
63.00
0.79
none
75700004
757d
25-45cm
25
45
70.00
0.79
none
75700005
757e
45-74cm
45
74
63.00
1.33
none
75700006
757f
74-100cm
74
100
82.00
2.06
none
75700001
16.00
0.17
75700002
78.00
0.40
75700003
63.00
0.79
75700004
70.00
0.79
75700005
63.00
1.33
75700006
82.00
2.06
75700001
75700002
75700003
75700004
75700005
75700006
75700001
75700002
75700003
75700004
75700005
75700006
12-Dec-2005
Page 727 of 896
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