HR: 10:35h
AN: T22B-02 INVITED    [Abstracts]
TI: Southern African lithospheric structures and geometries imaged by SAMTEX: Clues to Archean tectonic processes
AU: Jones, A G
EM: alan@cp.dias.ie
AF: Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin, 0002, Ireland
AU: Muller, M R
EM: mark.muller@dias.ie
AF: Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin, 0002, Ireland
AU: * Miensopust, M P
EM: marion@cp.dias.ie
AF: Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin, 0002, Ireland
AU: Hamilton, M P
EM: mh@cp.dias.ie
AF: Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin, 0002, Ireland
AU: Garcia, X
EM: xavi@cp.dias.ie
AF: Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin, 0002, Ireland
AU: Evans, R L
EM: revans@whoi.edu
AF: Woods Hole Oceanographic Institution, Department of Geology and Geophysics, Clark South 172, 360 Woods Hole Road, Woods Hole, MA 02543-1542, United States
AU: Cole, P
EM: pcole@geoscience.org.za
AF: Council for Geoscience, 280 Pretoria Street, Silverton, Pretoria, 0001, South Africa
AU: Ngwisanyi, T
EM: tngwisanyi@gov.bw
AF: Geological Survey of Botswana, Private Bag 14, Lobatse, 0000, Botswana
AU: Hutchins, D
EM: dhutchins@mme.gov.na
AF: Geological Survey of Namibia, 1 Aviation Road, Windhoek, 0000, Namibia
AU: Fourie, C
EM: sfourie@csir.co.za
AF: Council for Scientific and Industrial Research, Meiring Naude Road, Brummeria, Pretoria, 0000, South Africa
AU: Evans, S F
EM: shane.evans@debeersgroup.com
AF: De Beers Group Services, Private Bag X01, Southdale, 2135, South Africa
AU: Mountford, A
EM: Andy.Mountford@riotinto.com
AF: Rio Tinto Mineral Exploration Inc., PO Box 695, 7th Floor Castlemead, Lower Castle Street, Bristol, BS99 1FS, United Kingdom
AU: Pettit, W
EM: Wayne.Pettit@bhpbilliton.com
AF: BHP Billiton, 6 Hollard Street, Johannesburg, 2001, South Africa
AU: Team, t
EM: alan@cp.dias.ie
AB: SAMTEX – The Southern African Magnetotelluric Experiment – is a lithospheric-scale, electromagnetic imaging project being undertaken by a multi-institutional, international consortium comprising academia, government and industry. The primary objective of SAMTEX is to determine the lithospheric geometries and internal structures of the major Archean cratons and their Proterozoic bounding belts in southern Africa with a view to elucidating Archean and Proterozoic tectonic processes of formation, deformation and destruction, and comparing those processes with those deduced for other Archean cratons and with their modern counterparts. To date, in three phases of acquisition over three years, MT data have been acquired at over 550 sites on over 9000 line kilometers in a spatial area exceeding a million square kilometers, making this the largest survey of its kind ever conducted. This paper will review the data acquired and present images and models of subsurface structures. In particular, the relationship between lithospheric electrical parameters and diamondiferous kimberlite pipes will be highlighted. Comparisons will be drawn with the Slave craton in northern Canada, which is as well-known geophysically, geochemically, petrologically and tectonically as the Kaapvaal craton.
UR: http://www.dias.ie/
DE: 0925 Magnetic and electrical methods (5109)
DE: 1515 Geomagnetic induction
DE: 8103 Continental cratons
DE: 8124 Earth's interior: composition and state (1212, 7207, 7208, 8105)
SC: Tectonophysics [T]
MN: 2007 Fall Meeting