The direction of magma flow in the formation of the Ferrar Large Igneous Province 180 million years ago, Coombs Hills, Victoria Land
Entry ID: K061_2005_2006_NZ_1

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Summary
Abstract: Exposed at Coombs Hills are vertical bladelike bodies of basaltic rock that cut across older white sedimentary rocks and through deposits of a Jurassic volcanic complex (Mawson Formation). The majority are inferred to be related to lava eruptions at the surface but there is no evidence that any of them pre-dated the explosive activity that produced the Mawson Formation. How magma reached the surface to feed massive basaltic lava flows of the Ferrar Large Igneous Province at Coombs Hills was investigated. Numerous rock samples were analysed by anisotropic magnetic susceptibility (AMS). Field observations of dyke texture, vesicularity, crystal population and lithic fragment content, dyke contacts with the country rock and joint patterns within the dykes was recorded. Systematic field investigations, aerial photograph studies of dyke orientation patterns and cross cutting realtionships between Jurassic Ferrar Dolerite dykes and associated fractures in the area, the fracture length distribution analysis of the dykes, a petrological study to determine mineralogy and degree of glassiness (which is a good indicator of magma fluidity) and a geochemical study of collected rock samples was used to interpret the overall magma distribution of the area.

Related URL
Link: VIEW PROJECT HOME PAGE
Description: Information about the investigators project


Geographic Coverage
 N: -76.96 S: -77.9  E: 161.37  W: 161.05
 Min Altitude: 1820  Max Altitude: 2675

Temporal Coverage
Start Date: 2005-11-28
Stop Date: 2006-01-06


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


Location Keywords
CONTINENT > ANTARCTICA
CONTINENT > ANTARCTICA > Coombs Hills
GEOGRAPHIC REGION > POLAR


Science Keywords
PALEOCLIMATE >LAND RECORDS >VOLCANIC DEPOSITS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >ELEMENTS >MAJOR ELEMENTS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >ELEMENTS >MINOR ELEMENTS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >ELEMENTS >TRACE ELEMENTS    [Definition]
SOLID EARTH >GEOMAGNETISM >PALEOMAGNETISM    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >IGNEOUS ROCKS    [Definition]
SOLID EARTH >ROCKS/MINERALS/CRYSTALS >MINERALS    [Definition]
SOLID EARTH >TECTONICS >PLATE TECTONICS >STRESS    [Definition]
SOLID EARTH >TECTONICS >VOLCANIC ACTIVITY >ERUPTION DYNAMICS    [Definition]
SOLID EARTH >TECTONICS >VOLCANIC ACTIVITY >ERUPTION DYNAMICS >LAVA COMPOSITION/TEXTURE    [Definition]
SOLID EARTH >TECTONICS >VOLCANIC ACTIVITY >ERUPTION DYNAMICS >MAGMA COMPOSITION/TEXTURE    [Definition]
SOLID EARTH >TECTONICS >VOLCANIC ACTIVITY >ERUPTION DYNAMICS >PYROCLASTICS COMPOSITION/TEXTURE    [Definition]
SOLID EARTH >TECTONICS >PLATE TECTONICS    [Definition]


ISO Topic Category
GEOSCIENTIFIC INFORMATION


Platform
GROUND-BASED OBSERVATIONS    [Information]


Quality
Any remaining geological samples are lodged in the geology department, University of Otago. All data is in the MSc thesis. Some photographs and field notebooks may reside with the investigator.


Data Set Progress
COMPLETE


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


EMILIE GUEGAN
Role: INVESTIGATOR
Email: gueem851 at student.otago.ac.nz


MARAMA GARLAND
Role: TECHNICAL CONTACT


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


Publications/References
Guegan, E. 2006. Magma supply dynamics of the Ferrar Large Igneous Province, Coombs Hills, Antarctica. MSc thesis, University of Otago, Dunedin

Garland, M. 2006. Mawson Ferrar Dolerite relationships, northern East Ridge, Coombs Hills, Antarctica. BSc thesis, University of Otage, Dunedin

Ross, P.S., White, J.D.L. And McClintock. 2007 (online). Physical volcanology of mafic volcaniclastic deposits and lavas in the Coombs-Allan Hills area, Ferrar large igneous province, Antarctica. In: Physical Volcanology of Large Igneous Provinces. Skilling, I.O. and White, J.D.L. (eds). Journal of Volcanoloy and Geothermal Research.

Garland, M., Bannister, J., Lee, D.E. And White, J.D.L. 2007. A coniferous tree stump of Middle Jurassic age from the Ferrar Basalt, Coombs Hills, southern Victoria Land, Antarctica. New Zealand Journal of Geology and Geophysics 50:263-269.

Creation and Review Dates
DIF Creation Date: 2005-10-11
Last DIF Revision Date: 2009-02-13

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