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The direction of magma flow and behaviour of the magma in the formation of the Ferrar Large Igneous Province 180 million years ago, Pandora Spyre and Terra Cotta Mountain, Victoria Land
Entry ID: K061_2007_2008_NZ_1

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Summary

Abstract: Exposed at Terra Cotta Mountain and Pandora Spyre are vertical bladelike bodies of basaltic rock which cut across older pale colored sedimentary rocks. The pathway the magma took to the earth's surface when it erupted and the behaviour of rising basaltic magma as it advanced towards the surface was investigated. Field observations of dyke texture, vesicularity, crystal population and lithic fragment content, dyke contacts with the country rock and joint patterns within the dykes, field measurements of veins, joints and fractures in country rock next to the dykes and sills was all investigated. Numerous rock samples were analysed by anisotropic magnetic susceptibility (AMS) to determine magma flow direction. A petrological study to determine mineralogy and degree of glassiness (which is a good indicator of magma fluidity) was carried out and a geochemical study of collected rock samples at Pandora Spyre and Terra Cotta Mountain was used to interpret if the magma was provided by separate events from distinct sources or not, and whether the magmas formed by various degrees of partial melting from the same source and the degree of assimilation/contamination of these magmas.

Related URL

Link: VIEW PROJECT HOME PAGE
Description: Information about the investigators

Geographic Coverage

N: -77.7263 S: -77.9006 E: 161.343 W: 161.333
Min Altitude: 800 Max Altitude: 2000

Temporal Coverage

Start Date: 2007-11-20

Stop Date: 2007-12-20

Paleo_Temporal_Coverage

Paleo Start Date: 180 Ma
Paleo Stop Date: 180 Ma
Chrono Unit:

Location Keywords

CONTINENT > ANTARCTICA > Pandora Spyre
CONTINENT > ANTARCTICA > Terra Cotta Mountain
CONTINENT > ANTARCTICA
GEOGRAPHIC REGION > POLAR

ISO Topic Category

GEOSCIENTIFIC INFORMATION

Platform

GROUND-BASED OBSERVATIONS [Information]

Quality

Any remaining geological samples are lodged in the geology department, University of Otago. Please contact the investigator for more information.

Data Set Progress

IN WORK

Originating Center

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

JAMES D.L WHITE
Role: INVESTIGATOR
Phone: +64 3 479 7519
Fax: +64 4 479 7527
Email: james.white at stonebow.otago.ac.nz
Contact Address:
Geology department
Universoty of Otago
PO Box 56
Dunedin
Country: NEW ZEALAND

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: 2005-10-11

Last DIF Revision Date: 2009-02-13

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