Summary Abstract: 35 holes were drilled through the ice in the smaller western lobe of Lake Bonney and the bathymetry of the lake was determined. A further 52 holes were used for the eastern lobe bathymetry. Sediment cores of up to 2m depth were obtained from the lake floor and analysed to determine the nature of the sediment cores and halite crystals recovered. The drill rig worked so well, it was transferred to Lake Vanda to obtain some cores from there to compliment previous cores which were not of the same quality. The expedition survey discovered and mapped the extent of the very large, pure, clear halite crystals occurring below 30m depth. Subsequent drilling resulted in cores having samples of dihydrohalite analysed by x-ray diffraction. A geomorphic investigation was made of the area extending from the Taylor Glacier snout down valley as far as the Naussbaum Reigel. As many as 23 former lake levels were identified. A small meltwater stream from the Calkin Glacier flowed overland until it reached a prominent kame terrace about 60m above Lake Bonney. The stream then disappeared into a cave some 15m long and 3m high. The stream was followed and studied to determine thermokarst processes, a term given when the melting of ground ice in unconsolidated sediments caused subsidence and pseudo-karst landforms like melt dolines, caves, natural bridges and subsurface flow. The overland flow and stream bifurcation of the Lake Bonney Reigel had the channel profiles surveyed in detail.

Related URL

Link: VIEW RELATED INFORMATION Description: The investigators homepage

Parent DIF

This data set description is a member of a collection. The collection is described in K009_1969_1990_NZ_1

Geographic Coverage

N: -77.25

S: -77.8333

E: 163.5

W: 160.5

Temporal Coverage

Start Date: 1973-11-01

Stop Date: 1974-02-01

Location Keywords

CONTINENT > ANTARCTICA CONTINENT > ANTARCTICA > TAYLOR VALLEY CONTINENT > ANTARCTICA > LAKE BONNEY GEOGRAPHIC REGION > POLAR

Science Keywords

TERRESTRIAL HYDROSPHERE >SURFACE WATER >LAKES    [Definition]

LAND SURFACE >SOILS >SOIL CHEMISTRY    [Definition]

ISO Topic Category

GEOSCIENTIFIC INFORMATION INLAND WATERS

Platform

GROUND STATIONS    [Information]

FIELD INVESTIGATION    [Information]

Instrument

SEDIMENT CORERS    [Information]

VISUAL OBSERVATIONS    [Information]

Quality

Please check the publications or contact the investigator for more information.

Data Set Progress

COMPLETE

Data Center

Antarctica New Zealand, New Zealand Antarctic Institute, New Zealand    [Information] Data Center URL: http://www.antarcticanz.govt.nz/ Data Center Personnel Name: SHULAMIT GORDON Phone: +64 3 358 0200 Fax: +64 3 358 0211 Email: s.gordon at antarcticanz.govt.nz Contact Address: Antarctica New Zealand Private Bag 4745 City: Christchurch Country: New Zealand

Personnel

CHRIS HENDY Role: INVESTIGATOR Phone: +64 7 856 2889 Ext 4381 Or 4392 Fax: +64 7 838 4218 Email: c.hendy at waikato.ac.nz Contact Address: Department of Chemistry University of Waikato Private Bag 3105 City: Hamilton Country: New Zealand

ALEX T WILSON Role: INVESTIGATOR Email: retired

CEISHA POIROT Role: DIF AUTHOR Phone: +64 3 358 0200 Fax: +64 3 358 0211 Email: c.poirot at antarcticanz.govt.nz Contact Address: Antarctica New Zealand Private Bag 4745 City: Christchurch Country: New Zealand

SHULAMIT GORDON Role: DIF AUTHOR Phone: +64 3 358 0200 Fax: +64 3 358 0211 Email: s.gordon at antarcticanz.govt.nz Contact Address: Antarctica New Zealand Private Bag 4745 City: Christchurch Country: New Zealand

Creation and Review Dates

DIF Creation Date: 2009-04-15 Last DIF Revision Date: 2009-04-20

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