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KIMBERLITE SILLS AND DYKES ASSOCIATED WITH THE WESSELTON KIMBERLITE PIPE, KIMBERLEY, SOUTH AFRICA

2012; Geological Society of South Africa; Volume: 115; Issue: 1 Linguagem: Inglês

10.2113/gssajg.115.1.1

1996-8590

J. L. WHITE, R. S. J. Sparks, K. Bailey, Wayne Barnett, M. Field, W. Luke Windsor,

Geochemistry and Geologic Mapping

Research Article| March 01, 2012 KIMBERLITE SILLS AND DYKES ASSOCIATED WITH THE WESSELTON KIMBERLITE PIPE, KIMBERLEY, SOUTH AFRICA J.L. WHITE; J.L. WHITE Department of Earth Sciences, University of Bristol, Wills Memorial Building, Bristol, BS8 1RJ, United Kingdom, e-mail: jennywhite1983@hotmail.com; Steve.Sparks@bristol.ac.uk; Ken.Bailey@bristol.ac.uk Search for other works by this author on: GSW Google Scholar R.S.J. SPARKS; R.S.J. SPARKS Department of Earth Sciences, University of Bristol, Wills Memorial Building, Bristol, BS8 1RJ, United Kingdom, e-mail: jennywhite1983@hotmail.com; Steve.Sparks@bristol.ac.uk; Ken.Bailey@bristol.ac.uk Search for other works by this author on: GSW Google Scholar K. BAILEY; K. BAILEY Department of Earth Sciences, University of Bristol, Wills Memorial Building, Bristol, BS8 1RJ, United Kingdom, e-mail: jennywhite1983@hotmail.com; Steve.Sparks@bristol.ac.uk; Ken.Bailey@bristol.ac.uk Search for other works by this author on: GSW Google Scholar W.P. BARNETT; W.P. BARNETT SRK Consulting (Canada) Inc. 2200-1066 West Hastings Street, Vancouver, BC V6E 3X2, Canada, e-mail: wbarnett@srk.com Search for other works by this author on: GSW Google Scholar M. FIELD; M. FIELD Department of Earth Sciences, University of Bristol, Wills Memorial Building, Bristol, BS8 1RJ, United Kingdom DiaKim Consulting Limited, Mayfield, Wells Road, Wookey Hole, Wells, BA5 1DN, United Kingdom, e-mail: matthew-field@btconnect.com Search for other works by this author on: GSW Google Scholar L. WINDSOR L. WINDSOR Department of Earth Sciences, University of Bristol, Wills Memorial Building, Bristol, BS8 1RJ, United Kingdom, e-mail: seroster99@hotmail.com Search for other works by this author on: GSW Google Scholar Author and Article Information J.L. WHITE Department of Earth Sciences, University of Bristol, Wills Memorial Building, Bristol, BS8 1RJ, United Kingdom, e-mail: jennywhite1983@hotmail.com; Steve.Sparks@bristol.ac.uk; Ken.Bailey@bristol.ac.uk R.S.J. SPARKS Department of Earth Sciences, University of Bristol, Wills Memorial Building, Bristol, BS8 1RJ, United Kingdom, e-mail: jennywhite1983@hotmail.com; Steve.Sparks@bristol.ac.uk; Ken.Bailey@bristol.ac.uk K. BAILEY Department of Earth Sciences, University of Bristol, Wills Memorial Building, Bristol, BS8 1RJ, United Kingdom, e-mail: jennywhite1983@hotmail.com; Steve.Sparks@bristol.ac.uk; Ken.Bailey@bristol.ac.uk W.P. BARNETT SRK Consulting (Canada) Inc. 2200-1066 West Hastings Street, Vancouver, BC V6E 3X2, Canada, e-mail: wbarnett@srk.com M. FIELD Department of Earth Sciences, University of Bristol, Wills Memorial Building, Bristol, BS8 1RJ, United Kingdom DiaKim Consulting Limited, Mayfield, Wells Road, Wookey Hole, Wells, BA5 1DN, United Kingdom, e-mail: matthew-field@btconnect.com L. WINDSOR Department of Earth Sciences, University of Bristol, Wills Memorial Building, Bristol, BS8 1RJ, United Kingdom, e-mail: seroster99@hotmail.com Publisher: Geological Society of South Africa First Online: 09 Mar 2017 Online ISSN: 1996-8590 Print ISSN: 1012-0750 © 2012 Geological Society of South Africa South African Journal of Geology (2012) 115 (1): 1–32. https://doi.org/10.2113/gssajg.115.1.1 Article history First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation J.L. WHITE, R.S.J. SPARKS, K. BAILEY, W.P. BARNETT, M. FIELD, L. WINDSOR; KIMBERLITE SILLS AND DYKES ASSOCIATED WITH THE WESSELTON KIMBERLITE PIPE, KIMBERLEY, SOUTH AFRICA. South African Journal of Geology 2012;; 115 (1): 1–32. doi: https://doi.org/10.2113/gssajg.115.1.1 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 Field relations, petrography and bulk rock geochemistry constrain the emplacement mechanisms and petrogenesis of a kimberlite sill complex exposed in water tunnels at Wesselton Mine, Kimberley. The sill complex, together with associated dykes, is precursor to the main Wesselton pipe and contains: aphanitic kimberlite with a carbonatitic groundmass of calcite, perovskite, spinel, serpentine and phlogopite, with variations from rocks rich in olivine microphenocrysts to rocks with little or no olivine;macrocrystic kimberlite containing entrained harzburgite microxenoliths, olivine macrocrysts and strongly reacted orthopyroxene; and,a 'green' aphanitic kimberlite.The sills were emplaced as multiple intrusions into the upper Dwyka shales immediately below a Karoo dolerite sill in a zone several metres thick. Emplacement of the sill complex was governed by the rigidity of the dolerite sill, which prevented the magma from breaching the surface. Feeder dykes to the sills were influenced by a regional crustal stress system with the principal vector of horizontal compression being between eastwest and northwest-southeast. Serpentinisation has pseudomorphed olivine, replaced calcite, apatite and phlogopite in the groundmass and thereby changed the bulk compositions. Geochemcal and mineral chemistry data on spinels and phlogopites indicate intrusion of several magma batches with different petrogenetic histories. The magmas are transitional to carbonatite with compositional variations linked to partial melting, assimilation of xenocrysts, entrainment of xenoliths, xenocrysts and macrocryst, fractional crystallization and flow differentiation during ascent and emplacement. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.