Intrusion mechanisms of the southwestern Rustenburg Layered Suite as deduced from the Spruitfontein inlier

Research Article| June 01, 2000 Intrusion mechanisms of the southwestern Rustenburg Layered Suite as deduced from the Spruitfontein inlier B.M. Clarke; B.M. Clarke Council for Geoscience, P.O. Box 900, Pietermaritzburg, 3200 Republic ofSouth Africa, E-mail: geopmb@mweb.co.za Search for other works by this author on: GSW Google Scholar R. Uken; R. Uken School of Geological and Computer Sciences, University of Natal, Durban, 4041 Republic of South Africa, E-mail: uken@geology.und.ac.za; watkeys@geology.und.ac.za Search for other works by this author on: GSW Google Scholar M.K. Watkeys M.K. Watkeys School of Geological and Computer Sciences, University of Natal, Durban, 4041 Republic of South Africa, E-mail: uken@geology.und.ac.za; watkeys@geology.und.ac.za Search for other works by this author on: GSW Google Scholar Author and Article Information B.M. Clarke Council for Geoscience, P.O. Box 900, Pietermaritzburg, 3200 Republic ofSouth Africa, E-mail: geopmb@mweb.co.za R. Uken School of Geological and Computer Sciences, University of Natal, Durban, 4041 Republic of South Africa, E-mail: uken@geology.und.ac.za; watkeys@geology.und.ac.za M.K. Watkeys School of Geological and Computer Sciences, University of Natal, Durban, 4041 Republic of South Africa, E-mail: uken@geology.und.ac.za; watkeys@geology.und.ac.za Publisher: Geological Society of South Africa Accepted: 15 Jun 2000 First Online: 07 Mar 2017 Online ISSN: 1996-8590 Print ISSN: 1012-0750 © 2000 Geological Society of South Africa South African Journal of Geology (2000) 103 (2): 120–127. https://doi.org/10.2113/103.2.120 Article history Accepted: 15 Jun 2000 First Online: 07 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation B.M. Clarke, R. Uken, M.K. Watkeys; Intrusion mechanisms of the southwestern Rustenburg Layered Suite as deduced from the Spruitfontein inlier. South African Journal of Geology 2000;; 103 (2): 120–127. doi: https://doi.org/10.2113/103.2.120 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietySouth African Journal of Geology Search Advanced Search Abstract Syn-Rustenburg Layered Suite deformation in the Spruitfontein inlier of the western Bushveld Complex metamorphic aureole provides an insight into the emplacement mechanisms of the sill-like Rustenburg Layered Suite. East—northeast-trending ductile structures were formed during north—northwest- to south—southeast-oriented compression caused by the lateral propagation of east—northeast- or east-trending Marginal Zone finger-like sills. These fingers appear to have been largely co-planar in the west of the inlier, such that folding occurred in the region of compression between adjacent sills. With progression to the east, however, the fingers apparently diverged more and the wedging effect of the magma at the lower level of the finger system initiated rigid body rotation of Pretoria Group rocks, and the formation of a bridge structure between the dilating fingers. The orientation of syn-Rustenburg Layered Suite deformational features, coupled with Rustenburg Layered Suite facies variations across the inlier, suggest that magma flow was directed towards the east or east—northeast. Field relations do not elucidate whether or not the Spruitfontein inlier is still attached to the floor; however agenetic model whereby the inlier was initially deformed by intrusion-related processes and then became slightly detached from the floor may provide the most satisfactory explanation of Rustenburg Layered Suite compartmentalization across the inlier. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.