Ross Sea Region Soil Sites
489000
489
7-Jan-1983
IBC, GGC
Coombs Hills in the Convoy Range, Trans-antarctic Mountains, between the Odell and Cambridge Glaciers
Permafrost weathering examination
B&W, CS Pro & Lscp
No
159.9100
-76.8000
76deg 48.0'S
-159deg -54.6'E
cf. Notes for DESCR below
0
2,220
cf. Notes for GEOLAND below
Xerous, recent widespread 3.5cm snowfall but negligible thawing
-32
central mountain
Till derived from dolerite, tuff and sandstones
Nil observed
Well developed 10-15m nets with raised centres and troughs up to 1m deep
| SURFACE WEATHERING or |
| SURFACE FEATURES |
| Surface boulders are up to 40cm across and are moderately stained and oxidised and show some exfoliation and pitting on upper surfaces; salt weathering is |
| occurring beneath surface stones where they are in contact with the soil |
Nil
489a 3-0cm
101
surface pebbles, cobbles and boulders (8% <2mm)
102
subangular and subrounded and non to moderately stained
103
some particles strongly altered,
489b 0-5cm
201
strong brown (7.5YR 5/6) sandy pebble and cobble gravel (36% <2mm)
202
loose to weakly cohesive
203
weakly developed vesicular crust formed in places
204
some diffuse salt accumulations
205
rock particles subangular to subrounded and weakly stained and some insitu crumbling (ghosts)
206
distinct boundary,
489c 5-11cm
301
strong brown to reddish yellow (7.5YR 5/6-6/6) sandy pebble and cobble gravel
302
moderately cohesive
303
rock particles mainly subangular and unstained
304
distinct boundary,
489d 11-20cm
401
brownish yellow (10YR 6/6) cobbly silty sand
402
weakly cohesive
403
scattered salt flecks forming a distinct horizon
404
rock particles mainly subrounded and unstained
405
diffuse boundary,
489e 20-40cm
501
very pale brown (10YR 7/4) cobbly sandy silt (51% <2mm)
502
weakly cohesive
503
a few fine salt flecks
504
rock particles mainly angular and unstained
505
sharp boundary,
489f 40-46cm
601
drill cuttings
602
dark brown sandy gravel (7.5YR 4/4 moist),
489f 56-73cm
801
yellowish brown (10YR 5/4 moist),
489g 46-56cm
701
drill cuttings
702
yellowish brown sandy gravel (10YR 5/4 moist),
489g 73-88cm
901
drill cuttings
902
yellowish brown sandy gravel (10YR 5/4 moist),
489h 88-103cm
1001
drill cuttings
1002
yellowish brown sandy gravel (10YR 5/4 moist),
489i 103-120cm
1101
drill cuttings
1102
yellowish brown sandy gravel (10YR 5/4 moist),
489j 120-140cm
1201
drill cuttings
1202
yellowish brown sandy gravel (10YR 5/4 moist).
Yes
Hard ice-cemented
40
3
(40cm)
Descr
| 2km N of Mt Brooke on the floor of an old undulating glacially eroded valley; the surface is uneven with a broad hummock and swale topography with small |
| scattered snowbanks; the site is about 100m W of site 488, on an undulating surface that is about 20m above the valley floor; the site is on the upper edge of a |
| small hummock |
Geoland
| Outcropping rocks on Mt Brooke and adjacent hills include Jurassic tuffs and lavas, Ferrar Dolerite and Beacon Group sediments; the drift mantle on the valley |
| floor is continuous but appears to vary in weathering and age from place to place; on this slightly higher surface, soil development appears greater than in soil |
| 488 |
| Soluble Salt |
| Concentration |
48900001
48900002
60.00
42.00
17.00
15.00
9.00
8.00
7.00
1.00
0.38
48900003
50.00
36.00
16.00
16.00
11.00
10.00
9.00
1.00
0.35
48900004
59.00
43.00
13.00
13.00
10.00
11.00
9.00
1.00
0.33
48900005
63.00
42.00
14.00
13.00
9.00
11.00
9.00
1.00
0.33
48900006
97.00
31.00
18.00
15.00
11.00
12.00
10.00
2.00
0.26
48900007
100.00
15.00
13.00
15.00
13.00
17.00
18.00
7.00
0.73
48900008
98.00
11.00
14.00
17.00
14.00
17.00
19.00
7.00
0.44
48900009
97.00
34.00
14.00
12.00
10.00
13.00
12.00
5.00
0.39
48900010
100.00
15.00
13.00
15.00
13.00
17.00
18.00
7.00
0.73
48900011
96.00
14.00
12.00
14.00
13.00
18.00
21.00
7.00
0.82
48900012
94.00
14.00
14.00
15.00
13.00
17.00
18.00
8.00
0.75
48900001
48900002
7.60
2.86
7.00
13.00
2.10
0.03
0.01
23.00
5.80
48900003
8.40
20.30
70.00
14.00
10.50
0.24
0.01
16.10
48900004
8.70
1.98
8.70
4.60
2.90
0.04
0.01
9.10
15.50
48900005
8.80
1.95
8.80
4.90
2.50
0.04
0.01
8.90
5.80
48900006
8.60
1.24
5.10
5.10
1.90
0.03
0.01
8.90
1.30
48900007
8.30
1.51
6.10
5.30
1.70
0.03
0.01
9.60
1.20
48900008
8.50
1.47
5.80
3.70
1.50
0.03
0.01
9.10
1.30
48900009
8.30
1.25
4.40
4.30
1.60
0.02
0.01
8.40
0.90
48900010
8.30
1.47
4.40
7.10
1.30
0.03
0.01
10.90
0.30
48900011
8.40
1.17
4.30
4.60
1.00
0.04
0.01
8.90
0.04
48900012
8.30
0.97
3.40
3.90
1.00
0.02
0.01
7.00
0.13
48900001
48900002
12
10
7
10
10
12
5
15
15 zeolite, 5 mica-smectite
48900003
10
10
6
10
6
10
20
20 zeolite, 8 mica-smectite
48900004
10
7
3
7
3
8
2
45
15 zeolite
48900005
16
7
7
7
10
3
20
28 zeolite, 7 mica-smectite
48900006
12
5
5
5
5
12
3
20
30 zeolite, 3 mica-smectite
48900007
70
7
22 zeolite, 1 mica-smectite
48900008
70
1
5
22 zeolite, 2 mica-smectite
48900009
70
1
6
23 zeolite,
48900010
60
1
7
30 zeolite, 2 mica-smectite
48900011
70
1
3
24 zeolite, 2 mica-smectite
48900012
73
1
8
20 zeolite, 18 cristobalite
12-Dec-2005
Page 447 of 896
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