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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
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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.
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Related URL
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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
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Paleo Start Date:
180 Ma
Paleo Stop Date: 180 Ma Chrono Unit: |
Location Keywords
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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
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GEOSCIENTIFIC INFORMATION
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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
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Antarctica New Zealand, New Zealand Antarctic Institute, New Zealand
[Information]
Data Center URL: http://www.antarcticanz.govt.nz/
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Personnel
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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 |
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EMILIE
GUEGAN Role: INVESTIGATOR Email: gueem851 at student.otago.ac.nz |
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MARAMA
GARLAND Role: TECHNICAL CONTACT |
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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 |
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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.
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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