Site Information

Site number:
511
Authors:
IBC, GGC
Date recorded:
1983/01/19
Reason Sampled:
Soil weathering examination
Description:
Approximately 3km WSW of Battleship Promontory and 1km north of an un-named ice tongue; an undulating ridge surface and on a flat upper surface
Altitude:
1350 m
Aspect:
Nil
Slope:
0 °
Location Data
Observer IBC GGC
GPS No
Latitude Longitude DMS 76° 54.8' S 160° 49' E 76° 56' S 160° 44' E
Latitude Longitude DD -76.9133 160.817 -76.933 160.733
Latitude longitude precision DD 0.0008 0.008 0.008 0.008
Locality Convoy Range, Trans-antarctic Mountains, Alatna valley
Survey

Climate

Soil climate zone:
Central mountain
Estimated mean annual temperature:
-30 °C
Frozen ground depth:
30 cm
Frozen type:
Hard ice-cemented
Frozen comment:
30cm

Geology

Geological setting:
Ferrar Dolerite forms extensive sills and the till appears to be derived from the local dolerite; with increasing distance from the ice front, soil weathering increases; this till marks the oldest identifiable moraine from the ice mass to the north of Mt Bergen; the soil sequence suggests that ice retreat has occurred very slowly
Patterned ground:
Weakly developed broad shallow nets
Surface weathering or surface features:
Dolerite boulders are strongly stained and rounded with marked exfoliation of oxidised surfaces; well developed ventiforms; a well developed pebble and cobble pavement; distinct up- wind abrasion of upstanding boulders; fine grained dolerite clasts are well pitted; salts are present beneath some surface clasts with the undersides of the clasts having distinct exfoliation

Soil

Soil parent material:
Doleritic till with some minor sandstone
Previous disturbance:
Nil
Soil weathering stage:
6 5 (Campbell & Claridge 1975)
Soil moisture status:
Some small local snow patches; the site is dry with no sign of soil moistening
Biological activity:
Some lichen patches on rock surfaces
Profile Description
HorizonDepthDescription
511a -3 – 0 cm surface pebble and cobble pavement; moderately to strongly stained and subrounded with many clasts ventiformed,
511b 0 – 3 cm yellowish red (5YR 4/6) granular and pebbly gravely sand; moderately cohesive; moderately developed vesicular structure; scattered salt patches; some ghosts; rock particles subangular to subrounded, moderately to strongly stained and partly altered; distinct boundary,
511c 3 – 12 cm brown to dark brown (7.5YR 4/4) sandy gravel; loose; many diffuse salt flecks with some concentrations around rocks and in disaggregating clasts; rock particles subangular to subrounded moderately to strongly stained and some partly altered; indistinct boundary,
511d 12 – 30 cm dark yellowish brown (10YR 4/4) granular gravel; loose; some disaggregated clasts forming weak ghosts; rock particles subangular to subrounded, moderately stained and some partly altered; indistinct boundary,
511e 20 – 30 cm brown to dark brown (7.5YR 4/4) granular gravel in rock cracks; loose; rock particles subangular and weakly stained; sharp boundary, on frozen ground

Sample Data

Physical Data
Sample nameDepth descriptionTop (cm)Base (cm)Bulk DensityDry Bulk DensityGravimetric MoistureVol. Moisture (BD=2)
511a 3-0cm -3.0 0.0 No
511b 0-3cm 0.0 3.0 No
511c 3-12cm 3.0 12.0 No
511d 12-20cm 12.0 20.0 No
511e 20-30cm 20.0 30.0 No
Sample solution chemistry
Sample namepHNa meq/100gCa meq/100gMg meq/100gK meq/100gCl meq/100gSO4 meq/100gNO3 meq/100gEC mmho/cmSoluble SaltNotes
511a                      
511b 7.46 5.7 3.4 1.2 0.02 0.05 10.2 1.3 1.25 .  
511c 7.58 9.6 1.8 1.4 0.04 0.01 9.8 2.2 2.09 .  
511d 9.38 4.9 0.22 0.21 0.03 0.01 2.6 1.5 0.895 .  
511e 9.32 6.4 0.62 0.52 0.04 0.01 2.7 1.8 1.06 .  
Particle size distribution
Sample name< 2 mm2 - 0.5 mm0.5 - 0.25 mm0.25 - 0.1 mm0.1 - 0.05 mm0.05 - 0.02 mm0.02 - 0.002 mm< 0.002 mmFe2O3CaCO3Notes
511a
511b 76.0 12.0 4.0 1.0 1.0 4.0 2.0 0.24 .
511c 54.0 14.0 7.0 4.0 7.0 11.0 3.0 0.33 .
511d 66.0 17.0 6.0 2.0 2.0 6.0 1.0 0.21 .
511e 76.0 9.0 4.0 2.0 3.0 4.0 2.0 0.21 .
Clay Mineralogy
Sample nameMicaIHMHIV - IHMICHLVTHIVCHLSMCHL SMFE - CHLHTQTZFLDHBCALNotes
511a :
511b . . . . . . . . . . . . 50.0 . disordered mica-smectite:
511c . . . . . . . . . . . . 50.0 . disordered mica-smectite:
511d . . . . . . . . . . . . 40.0 . disordered mica-smectite:
511e . . . . . . . . . . . . 50.0 . disordered mica-smectite:
National Soil Archive Samples
Sample nameNSA Sample IdContainer typeFraction type
511a M22/3678 medium coarse
511a M22/3679 White lid small fine
511a M22/7901 Glass vial metal lid
511b M22/3680 White lid small coarse
511b M22/3681 medium fine
511b M22/7902 Glass vial metal lid
511c M22/3682 White lid small coarse
511c M22/3683 medium fine
511c M22/7903 Glass vial metal lid
511d M22/3684 White lid small coarse
511d M22/3685 medium fine
511d M22/7904 Glass vial metal lid
511e M22/3686 White lid small coarse
511e M22/3687 White lid small fine
511e M22/7905 Glass vial metal lid

Photos

Photo record:
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