- Title
- Rock magnetic stratigraphy of a mafic layered sill: a key to the Karoo volcanics plumbing system
- Creator
- Maes, S M, Ferré, E E, Tikoff, B, Brown, P E, Marsh, Julian S
- Date
- 2008
- Type
- text
- Type
- article
- Identifier
- http://hdl.handle.net/10962/144901
- Identifier
- vital:38389
- Identifier
- https://doi.org/10.1016/j.jvolgeores.2005.07.038
- Description
- The Insizwa sill is an 1 km-thick subhorizontal layered mafic intrusion and part of the Karoo Large Igneous Province in South Africa. This well-exposed intrusion consists of several superimposed petrologically and geochemically distinct units. Magnetic methods were used to study the intrusion in order to constrain the physical processes active in these types of bodies during crystallization. Rock magnetism studies indicate that within different petrologic units bulk susceptibility is controlled by primary magnetite (with minor pyrrhotite) and/or paramagnetic minerals (olivine, pyroxene). New magnetic data based on 659 specimens obtained from 3 vertical borehole cores, each spaced 5 km apart, confirm the prominent vertical zonation in low field magnetic susceptibility (Klf), degree of anisotropy (Pj) and orientation of the anisotropy of magnetic susceptibility (AMS) axes.
- Format
- 19 pages, pdf
- Language
- English
- Relation
- Journal of Volcanology and Geothermal Research, Marsh, Julian S. Karoo volcanic and intrusive rocks – Lesotho and Eastern Cape. ETH geological Excursion to South Africa 2013. Field Guide. January 2013. Department of Geology, Rhodes University, Grahamstown, South Africa., Journal of Volcanology and Geothermal Research volume 172 number 1-2 75 92 2008
- Rights
- Publisher
- Rights
- Use of this resource is governed by the terms and conditions of the Elsevier Terms and Conditions Statement (https://www.elsevier.com/legal/elsevier-website-terms-and-conditions)
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