Laboratory AMS (Anisotropy of Magnetic Susceptibility) measurements made on a collection of sill samples collected from the Theron Mountains, Antarctica, during the 2004-2005 field season.
AMS involves the collection of some 1 metric tonne of oriented samples and the lab-based determination of the magmatic flow fabric of the rock. Models concerning the location of mantle plumes and triple junctions associated with the Mesozoic break-up of Gondwana in the Antarctic-southern Africa sector are not capable of independent testing, other than by geochemical and age dating methods. We determined the regional flow directions of the magmas in dyke and sill complexes in the areas of postulated plume heads and related triple points on the opposing conjugate margins. AMS was utilised to determine magmatic flow directions and constrain these with macroscopic observations of flow indicators.
AMS, Anisotropy of Magnetic Susceptibility, Gondwana break-up, Theron Mountains, magmatic flow fabric, palaeomagnetism
|Use Constraints:||These data are governed by NERC Data Policy.|
|ISO Topic Categories:||
|Organisation||British Antarctic Survey|
|Name||Dr W H Owens|
|Organisation||University of Birmingham|
|Name||Prof Donny Hutton|
|Name||Prof Paul Smith|
|Organisation||Oxford University Museum of Natural History|
|Reference:||Hutton, DHW, 2009. Insights into magmatism in volcanic margins: bridge structures and a new mechanism of basic sill emplacement - Theron Mountains, Antarctica. PETROLEUM GEOSCIENCE, Volume: 15, Issue: 3, Pages: 269-278. DOI: 10.1144/1354-079309-841
O'Driscoll, B., Troll, V.R., Reavy, R.J. and Turner, P., 2006. The Great Eucrite intrusion of Ardnamurchan, Scotland:Reevaluating the ring-dike concept. Geology 34 (3) 189-192.
Hutton, Owens, Leat, Curtis and Turner, 2006. Testing plume models: Dolerite sill flow directions and emplacement mechanisms in the Theron Mountains, Antarctica. DOI 10.1007/s10069-0 20
AFI project no: AFI 04/05 - Testing Gondwana break-up and plume models: constraints from magma flow directions
|Paleo Temporal Coverage:|
|Paleo Start Date||~180 Ma|
|Paleo End Date||~180 Ma|
|Detailed Location||Theron Mountains|
|Data Storage:||All datasets from geological analyses were included within the following paper:
Hutton, DHW, 2009. Insights into magmatism in volcanic margins: bridge
structures and a new mechanism of basic sill emplacement - Theron
Mountains, Antarctica. PETROLEUM GEOSCIENCE, Volume: 15, Issue: 3
Pages: 269-278. DOI: 10.1144/1354-079309-841