Ross Sea Region Soil Sites
240000
240
8-Dec-1969
IBC, GGC
Scott Glacier region, southern Trans-antarctic Mountains on the Watson Escarpment
Soil weathering examination
US Geological Survey 1:250 000 1968, Mount Blackburn
CS & B&W Lscp & Pr
No
-147.0830
-86.2333
86deg 14.0'S
147deg 5.0'E
At the southern end of Long Valley, on the north side of a dry valley and 6km north of Mount Blackburn; a valley side, lower midslope with an uneven surface
26
SW
1,950
cf. Notes for GEOLAND below
A dry surface with no residual snow patches or signs of snow thaw
-40
Inland Mountain
Altered and partly altered granitic bedrock
Nil observed
Nil
SURFACE WEATHERING or |
SURFACE FEATURES |
Granite boulders are exfoliating, partly rounded and have some cavernous weathering; dolerite boulders are moderately stained and show some exfoliation; |
granite erratics are up to 5m; reddish weathered material extends away from the sample location |
Nil
240 5-0cm
101
surface cobbles pebbles and granular sand
102
rock particles mainly rounded to subrounded and exfoliating,
240a 0-10cm
201
light red (10R 6/8) slightly sandy clay loam forming a weathered band between angular bedrock
202
moderately cohesive
203
a few salt flecks
204
siliceous rock particles unstained
205
indistinct boundary,
240b 10-30cm
301
red (10R 5/6) granular sandy clay loam forming a weathered band between angular bedrock
302
moderately cohesive
303
feldspars in rock particles are strongly altered,
240c 0-10cm
401
light grey (5Y 7/2) slightly sandy clay loam alongside reddish zone forming a weathered band between angular |
bedrock |
402
weakly cohesive
403
indistinct boundary,
240d 10-30cm
501
light grey (5Y 7/1 - 7/2) granular sandy clay loam forming a weathered band between angular bedrock
502
weakly cohesive
503
rock particles are strongly altered,
240e 0-5cm
601
yellowish red (7.5YR 6/8) sandy clay loam forming a mixed surface layer,
240f
701
rock sample from side of the profile,
240g
801
salts from beneath surface cobbles
Yes
a,b,c,d,e,f,g
Dry frozen
35
(>35cm)
Geoland
The basement rocks are granitic with sedimentary above lying on the Kukri Peneplane and dolerite intrusions; a thin moraine cover of dominantly granite but |
with some dolerite lies on the valley slope; a transverse weathering zone occurs in the granitic bedrock with distinct weathering changes over a 75cm wide band; |
the weathering may be related to a crush or fault zone in the bedrock or to proximity to and alteration by an intrusion |
Soluble Salt |
Concentration |
24000001
99.00
24000002
85.00
24000003
98.00
24000004
90.00
24000005
65.00
24000006
4.00
24000007
71.00
24000001
24000002
24000003
24000004
24000005
calcite
24000006
24000007
calcite/gypsum
24000001
24000002
24000003
24000004
24000005
24000006
24000007
12-Dec-2005
Page 197 of 896
240