Browse Data | 1992 - Vanda Station

Site Information

Site number:
708
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, 2.7m from the lake edge; this site is 2.7m downslope from site 707 and is at centre of the 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:
moist
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 has become moist throughgout as a result of capillary movement of water from the edge of Lake Vanda
Biological activity:
Profile Description
HorizonDepthDescription
708a 0 – 10 cm light yellowish brown to pale yellow (2.5Y 6/4-7/4) pebbly gravelly sand; loose; moist; rock particles angular and unstained; indistinct boundary,
708b 10 – 20 cm light yellowish brown to pale yellow (2.5Y 6/4-7/4) sandy pebble gravel; loose; moist; rock particles angular and unstained; indistinct boundary,
708c 20 – 30 cm light yellowish brown to pale yellow (2.5Y 6/4-7/4) sandy pebble gravel; loose; moist; rock particles angular and unstained; indistinct boundary,
708d 30 – 40 cm light yellowish brown to pale yellow (2.5Y 6/4-7/4) sandy pebble gravel; loose; moist; rock particles angular and unstained; indistinct boundary, on moist fragmented rock.

Sample Data

Physical Data
Sample nameDepth descriptionTop (cm)Base (cm)Bulk DensityDry Bulk DensityGravimetric MoistureVol. Moisture (BD=2)
708a 0-10 0 10 4.8
708b 10-20 10 20
708c 20-30 20 30 8.2
708d 30-40 30 40 11.0
Sample solution chemistry
Sample namepHNa meq/100gCa meq/100gMg meq/100gK meq/100gCl meq/100gSO4 meq/100gNO3 meq/100gEC mmho/cmSoluble SaltNotes
708a 8.44 1.5 4.1 1.3 0.2 5.1 2.1 0.01 1.358 .  
708b 8.28 0.5 2.1 0.6 0.2 2.0 1.4 0.01 0.742 .  
708c 8.18 0.2 2.0 0.7 0.2 2.3 0.8 0.01 0.711 .  
708d 8.18 . . . . 2.03 0.778 0.01 0.676 .  
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
708a 4.8 17.4 45.9 27.9 3.1 1.0 3.4 1.2 . .
708b 8.6 17.1 44.9 27.8 3.1 1.8 3.5 2.1 . .
708c 8.2 12.5 48.3 29.4 2.6 1.0 3.6 2.5 . .
708d 11.0 15.9 43.6 29.3 2.9 1.4 4.1 2.7 . .
Clay Mineralogy
Sample nameMicaIHMHIV - IHMICHLVTHIVCHLSMCHL SMFE - CHLHTQTZFLDHBCALNotes
708a :
708b :
708c :
708d :

Photos

Photo record:
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