Title page for ETD etd-06262012-142710


Document Type Master's Dissertation
Author Clark-Halkett, Chantelle Estelle
Email chantellecharkhalkett@yahoo.com
URN etd-06262012-142710
Document Title An investigation into the formation of the lower Main Zone in the eastern limb of the Bushveld complex, South Africa
Degree MSc
Department Geology
Supervisor
Advisor Name Title
Dr J Roberts Supervisor
Keywords
  • Bushveld
  • Main Zone
  • South Africa
Date 2012-04-13
Availability unrestricted
Abstract
The Main Zone is dominated by medium grained, homogeneous gabbronorite, and anorthosites. The plagioclase compositions of the core is ((Na(0.227 0.353), K (0.012 0.046), Ca (0.651 0.777)) Al (1.630 1.752) Si (2.183 2.345) O8) and at the rim is ((Na (0.189 0.371), K (0.005 0.108), Ca (0.651 0.777)) Al (1.630 1.752) Si (2.183 2.345) O8). The composition of orthopyroxene is ((Mg (0.660 0.808), Fe (0.206 0.309), Ca (0.007 0.081)) Si (0.960 1.037) O3) and the compositions of clinopyroxene is ((Mg (0.229 0.678), Fe (0.092 0.427), Ca (0.012 0.475) Si (0.776 1.012) O3. The Mg# and An# varies with depth, where plagioclase increase in concentration the An# increases and the Mg# decreases. The variations in magma compositions are attributed to interlayering of different lithologies which are the result of fractional crystallisation in the magma chamber. This is supported by linear trends of the major and trace element bivariant plots. The magmatic event forming the Main Zone resulted in lateral expansion of the sheet like magma chamber. The Main Zone formed through two magmas; first magma forming the lower Main Zone and the second magma, intruded the Main Zone at the level of the Pyroxenite Marker, forming the upper Main Zone.

Copyright 2010, University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria

Please cite as follows:

Clark-Halkett, CE 2010, An investigation into the formation of the lower Main Zone in the eastern limb of the Bushveld complex, South Africa, MSc dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd-06262012-142710 / >

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