Skip Navigation



Journal of Petrology Advance Access published online on December 3, 2004
Journal of Petrology, doi:10.1093/petrology/egh089
This Article
Right arrow FREE Full Text (PDF) Freely available
Right arrow All Versions of this Article:
46/3/579    most recent
egh089v1
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Add to My Personal Archive
Right arrow Download to citation manager
Right arrowRequest Permissions
Google Scholar
Right arrow Articles by HARRIS, C.
Right arrow Articles by CAWTHORN, R. G.
Right arrow Search for Related Content
GeoRef
Right arrow GeoRef Citation
Social Bookmarking
Add to CiteULike   Add to Connotea   Add to Del.icio.us  
What's this?

Journal of Petrology © Oxford University Press 2005; all rights reserved
Received January 1, 2004
Accepted October 5, 2004

Article

Oxygen and Hydrogen Isotope Stratigraphy of the Rustenburg Layered Suite, Bushveld Complex: Constraints on Crustal Contamination

CHRIS HARRIS 1*, JULIE J. M. PRONOST 2, LEWIS D. ASHWAL 3, and R. GRANT CAWTHORN 3

1 DEPARTMENT OF GEOLOGICAL SCIENCES, UNIVERSITY OF CAPE TOWN, RONDEBOSCH 7700, SOUTH AFRICA; DÉPARTEMENT DE GÉOLOGIE, UMR 6524, UNIVERSITÉ JEAN MONNET, 23 RUE PAUL MICHELON, F-42023 CÉDEX 2, FRANCE
2 DÉPARTEMENT DE GÉOLOGIE, UMR 6524, UNIVERSITÉ JEAN MONNET, 23 RUE PAUL MICHELON, F-42023 CÉDEX 2, FRANCE; LABORATOIRE MAGMAS ET VOLCANS, UMR 6524, 5 RUE KESSLER, 63000 CLERMONT-FERRAND, FRANCE
3 SCHOOL OF GEOSCIENCES, UNIVERSITY OF THE WITWATERSRAND, PRIVATE BAG 3, PO WITS, 2050, SOUTH AFRICA

* To whom correspondence should be addressed.
CHRIS HARRIS, E-mail: charris{at}geology.uct.ac.za


  Abstract

New {delta}18O values for plagioclase, pyroxene and olivine, and limited whole-rock {delta}D values are presented for samples from the Rustenburg Layered Suite of the Bushveld Complex, South Africa. In combination with existing data, these provide a much more complete composite O-isotope stratigraphy for the intrusion. Throughout the layered suite, mineral {delta}18O values indicate that the magmas from which they crystallized had {delta}18O values that were about 7·1{per thousand}, that is, 1·4{per thousand} higher than expected for mantle-derived magmas, suggesting extensive crustal contamination. More limited H-isotope data suggest that the OH present within whole rocks, regardless of the degree of alteration, is of magmatic origin and not an alteration phenomenon. There appears to be no systematic change in {delta}18O value with stratigraphic height and this requires the contamination to have taken place in a ‘staging chamber’ before emplacement of the magma(s) into the present chamber. Large amounts (30-40%) of contamination by the lower to middle crust are needed to explain these {delta}18O values, which is in general agreement with previous estimates based on Sr- and Nd-isotope data. Alternatively, smaller amounts of contamination (~20%) by sedimentary rocks, or their partial melts, represented by the country rock can explain the data, but it is not apparent how such material could have been present at the depth of the ‘staging chamber’ in the lower to middle crust.

Keywords: Bushveld Complex; Rustenburg Layered Suite; oxygen isotopes; hydrogen isotopes; crustal contamination.
Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us    What's this?


This article has been cited by other articles:


Home page
 GeologyHome page
S. C. Penniston-Dorland, B. A. Wing, P. A.M. Nex, J. A. Kinnaird, J. Farquhar, M. Brown, and E. R. Sharman
Multiple sulfur isotopes reveal a magmatic origin for the Platreef platinum group element deposit, Bushveld Complex, South Africa
Geology, December 1, 2008; 36(12): 979 - 982.
[Abstract] [Full Text] [PDF]

Home page
 Eur J MineralHome page
D. Lenaz, R. Braidotti, F. Princivalle, G. Garuti, and F. Zaccarini
Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld Complex
European Journal of Mineralogy, July 1, 2007; 19(4): 599 - 609.
[Abstract] [Full Text] [PDF]

Home page
 J PetrologyHome page
S. K. Mondal and E. A. Mathez
Origin of the UG2 chromitite layer, Bushveld Complex
J. Petrology, March 1, 2007; 48(3): 495 - 510.
[Abstract] [Full Text] [PDF]


Disclaimer: Please note that abstracts for content published before 1996 were created through digital scanning and may therefore not exactly replicate the text of the original print issues. All efforts have been made to ensure accuracy, but the Publisher will not be held responsible for any remaining inaccuracies. If you require any further clarification, please contact our Customer Services Department.