Browse Data | 1992 - Vanda Station

Site Information

Site number:
706
Authors:
IBC, GGC
Date recorded:
1993/01/02
Reason Sampled:
soil moisture investigation of lake edge wetting front
Description:
80 m southwest of the Vanda Station Mess building on the small island on which the two disused helo pads are located, 6.9m from the lake edge; this site is the uppermost of 4 sites across the lake edge wetting fringe
Altitude:
92 m
Aspect:
SE
Slope:
7 °
Location Data
Observer GGC IBC
GPS No
Latitude Longitude DMS 77° 0.0' S 161° 40.0' E 75° 50' S 166° 45' E
Latitude Longitude DD -77.000 161.667 -75.83 166.75
Latitude longitude precision DD 0.008 0.008 0.08 0.04
Locality Vanda Station, Wright Valley at the eastern end of Lake Vanda
Survey not recorded

Climate

Soil climate zone:
coastal mountain
Estimated mean annual temperature:
-20 °C
Frozen ground depth:
35 ~
Frozen type:
dry frozen
Frozen comment:
~35

Geology

Geological setting:
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; subsequent to glaciation, the terrain has been subjected to drowning and emergence from fluctuating lake levels from Lake Vanda with some sorting or resorting of surficial materials
Patterned ground:
Surface weathering or surface features:
surface clasts are mainly angular and unstained

Soil

Soil parent material:
fractured, mainly lamprophyre dyke rock forming a sandy gravel mantle
Previous disturbance:
a relatively undisturbed site apart from treking
Soil weathering stage:
6 1 (Campbell & Claridge 1975)
Soil moisture status:
xerous; the soil surface is occasionally moistened by summer snowfalls; the site is just above the moistened capillary fringe zone
Biological activity:
Profile Description
HorizonDepthDescription
706a 0 – 10 cm light grey to pale yellow (2.5Y 7/2-7/4) pebbly sandy gravel; loose; rock particles angular and unstained; indistinct boundary,
706b 10 – 20 cm light grey to pale yellow (2.5Y 7/2-7/4) pebbly gravelly sand; loose; rock particles angular and unstained; indistinct boundary,
706c 20 – 30 cm light grey to pale yellow (2.5Y 7/2-7/4) pebbly sandy gravel; loose; rock particles angular and unstained; indistinct boundary,
706d 30 – 40 cm light grey (2.5Y 7/2) pebbly sandy gravel; loose; rock particles angular and unstained; indistinct boundary,
706e 40 – 50 cm light grey (2.5Y 7/2) pebbly gravel; loose rock particles angular and unstained; indistinct boundary, on fragmented bedrock.

Sample Data

Physical Data
Sample nameDepth descriptionTop (cm)Base (cm)Bulk DensityDry Bulk DensityGravimetric MoistureVol. Moisture (BD=2)
706a 0-10 0 10 0.1
706b 10-20 10 20 0.2
706c 20-30 20 30 0.2
706d 30-40 30 40 0.2
706e 40-50 40 50
Sample solution chemistry
Sample namepHNa meq/100gCa meq/100gMg meq/100gK meq/100gCl meq/100gSO4 meq/100gNO3 meq/100gEC mmho/cmSoluble SaltNotes
706a 8.76 0.16 1.2 0.4 0.07 0.9 0.8 0.04 0.304 .  
706b 8.73 0.1 1.0 0.1 0.04 1.1 0.2 0.002 0.306 .  
706c 8.65 0.06 1.2 0.1 0.03 1.4 0.05 . 0.338 .  
706d 9.1 0.03 0.9 0.1 0.02 0.6 0.4 . 0.128 .  
706e 9.14 0.03 1.1 0.1 0.03 0.6 0.7 . 0.148 .  
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
706a 0.1 10.9 44.0 36.2 4.0 1.6 1.6 1.5 . .
706b 0.2 13.8 47.9 29.2 2.8 1.1 2.7 2.5 . .
706c 0.2 13.5 47.4 30.0 2.8 1.1 2.7 2.5 . .
706d 0.2 12.1 49.0 29.5 3.3 1.4 2.1 2.5 . .
706e 0.2 18.7 42.6 24.9 3.9 2.8 3.6 3.4 . .
Clay Mineralogy
Sample nameMicaIHMHIV - IHMICHLVTHIVCHLSMCHL SMFE - CHLHTQTZFLDHBCALNotes
706a :
706b :
706c :
706d :
706e :

Photos

Photo record:
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