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Palaeomagnetic measurements on rocks from Mt Crean to determine the continental drift of gondwanaland
Entry ID: K045_1994_1995_NZ_1


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Summary
Abstract: The Beacon sediments of East Antarctica were deposited over the Devonian to Triassic geological periods, from 400 to 200 million years ago. Palaeomagnetic measurements on these rocks provide information on the continental drift of Gondwanaland and the geological history can be inferred. Past dating of Antarctic rocks finds a single pole, for a time 160 million years ago in the Jurassic period corresponding to a massive intrusion of dolerite sills into the Beacon sediments. Heat and fluid from these intrusions largely destroyed the primary magnetisation acquired by rocks older than them. Rock samples from the Victoria University of Wellington Antarctic rock collections were remeasured using newly developed techniques. Some rock samples were found to retain some primary magnetisation. Further samples were collected from promising sites to corroborate the measurements. 200 orientated cores, 25 mm in diameter and 50 to 150 mm long were obtained from Mt Crean on the edge of the polar plateau, 200km west of Scott Base, Mt Feather and Table Mountain. The sediments sampled were red siltstones from the Aztec Group, or Upper Devonian age. A reassessment of the structure of Gondwanaland and its climate at the time was reported due to these new results.

Related URL
Link: GET DATA
Description: The PETLAB database catalogue.


Geographic Coverage
 N: -77.9667 S: -77.9667  E: 160.0  W: 160.0
 N: -77.933334 S: -77.933334  E: 160.46666  W: 160.46666
 N: -77.8833 S: -77.8833  E: 159.5  W: 159.5

Temporal Coverage
Start Date: 1998-11-30
Stop Date: 1998-12-06


Location Keywords
CONTINENT > ANTARCTICA
CONTINENT > ANTARCTICA > TABLE MOUNTAIN
CONTINENT > ANTARCTICA > MT CREAN
CONTINENT > ANTARCTICA > MT FEATHER
GEOGRAPHIC REGION > POLAR


Science Keywords
LAND SURFACE >GEOMORPHOLOGY >TECTONIC LANDFORMS/PROCESSES    [Definition]
PALEOCLIMATE >LAND RECORDS >PALEOMAGNETIC DATA    [Definition]
SOLID EARTH >GEOMAGNETISM >PALEOMAGNETISM    [Definition]


ISO Topic Category
GEOSCIENTIFIC INFORMATION


Platform
FIELD SURVEYS    [Information]
LABORATORY    [Information]
FIELD INVESTIGATION    [Information]


Quality
Any remaining samples are stored in the Victoria University of Wellington rock collection, online on the PETLAB database.
For more information, please contact:

Stephen Eager
Collections Technician
School of Geography, Environment and Earth Science
Victoria University of Wellington
Phone: +64 4 463 6192
Email: stephen.eager@vuw.ac.nz


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
NERIDA BLEAKLEY
Role: INVESTIGATOR
Phone: +61 03 6233 3645
Email: Nerida.Bleakley at dpiw.tas.gov.au
Contact Address:
Water Management Planning, Water Resource Division
Department of Primary Industries and Water
PO BOX 44
City: Hobart
Province or State: Tasmania
Postal Code: 7001
Country: Australia


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: 2009-05-21
Last DIF Revision Date: 2009-06-06


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