Ghent University Academic Bibliography

Advanced

Cu isotope ratio variations in the Dikulushi Cu-Ag deposit, DRC: of primary origin or induced by supergene reworking?

Maarten Haest, Philippe Muchez, Jérôme C Petit and Frank Vanhaecke UGent (2009) ECONOMIC GEOLOGY. 104(7). p.1055-1064
abstract
This study investigates Cu isotope ratio variations in the high-grade, vein-type Cu-Ag deposit of Dikulushi, Democratic Republic of Congo. The Dikulushi deposit consists of a Cu-Pb-Zn-Fe mineralization, comprising sphalerite, chalcopyrite, bornite, and chalcocite that precipitated under reducing conditions. This mineralization was partly remobilized in more oxidizing conditions into a Cu-Ag mineralization phase, which is dominated by Ag-rich chalcocite. The upper part of the deposit is strongly reworked by weathering. Sulfides from the two types of mineralization and Cu carbonates/-silicates from the weathering zone display significant Cu isotope ratio variations. Chalcopyrite and chalcocite from the Cu-Pb-Zn-Fe and Cu-Ag mineralization types are characterized by variable low Cu isotope compositions (0.00 to -2.3 parts per thousand delta Cu-65). The Cu isotope composition for some chalcocite from the Cu-Ag mineralization deviates to lower delta Cu-65 values relative to that of chalcocite from the Cu-Pb-Zn-Fe mineralization. This deviation is likely related to remobilization of the Cu-Pb-Zn-Fe mineralization in an oxidizing environment. The isotopic composition of Cu in chalcocite from both mineralization types becomes higher toward the center of the orebody and as a function of depth. This variation could be related to physicochemical changes in the precipitation environment as a consequence of interaction of the reduced mineralizing brine with the oxidized host rock or might have been induced by supergene processes afterward. The supergene mineralization is composed of malachite, azurite, and chrysocolla that are enriched in Cu-65 (1.37-2.65 parts per thousand delta Cu-65).
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
COMPLEXES, CONGO, MINERALIZATION, KATANGA, BRINES, SOURCE MASS-SPECTROMETRY, COPPER, FRACTIONATION
journal title
ECONOMIC GEOLOGY
Econ. Geol.
volume
104
issue
7
pages
10 pages
Web of Science type
Article
Web of Science id
000273143000008
JCR category
GEOCHEMISTRY & GEOPHYSICS
JCR impact factor
1.208 (2009)
JCR rank
40/74 (2009)
JCR quartile
3 (2009)
ISSN
0361-0128
DOI
10.2113/gsecongeo.104.7.1055
language
English
UGent publication?
yes
classification
A1
id
917136
handle
http://hdl.handle.net/1854/LU-917136
alternative location
http://econgeol.geoscienceworld.org/cgi/content/abstract/104/7/1055
date created
2010-03-31 15:27:30
date last changed
2010-04-15 11:36:29
@article{917136,
  abstract     = {This study investigates Cu isotope ratio variations in the high-grade, vein-type Cu-Ag deposit of Dikulushi, Democratic Republic of Congo. The Dikulushi deposit consists of a Cu-Pb-Zn-Fe mineralization, comprising sphalerite, chalcopyrite, bornite, and chalcocite that precipitated under reducing conditions. This mineralization was partly remobilized in more oxidizing conditions into a Cu-Ag mineralization phase, which is dominated by Ag-rich chalcocite. The upper part of the deposit is strongly reworked by weathering. Sulfides from the two types of mineralization and Cu carbonates/-silicates from the weathering zone display significant Cu isotope ratio variations. Chalcopyrite and chalcocite from the Cu-Pb-Zn-Fe and Cu-Ag mineralization types are characterized by variable low Cu isotope compositions (0.00 to -2.3 parts per thousand delta Cu-65). The Cu isotope composition for some chalcocite from the Cu-Ag mineralization deviates to lower delta Cu-65 values relative to that of chalcocite from the Cu-Pb-Zn-Fe mineralization. This deviation is likely related to remobilization of the Cu-Pb-Zn-Fe mineralization in an oxidizing environment. The isotopic composition of Cu in chalcocite from both mineralization types becomes higher toward the center of the orebody and as a function of depth. This variation could be related to physicochemical changes in the precipitation environment as a consequence of interaction of the reduced mineralizing brine with the oxidized host rock or might have been induced by supergene processes afterward. The supergene mineralization is composed of malachite, azurite, and chrysocolla that are enriched in Cu-65 (1.37-2.65 parts per thousand delta Cu-65).},
  author       = {Haest, Maarten and Muchez, Philippe and Petit, J{\'e}r{\^o}me C and Vanhaecke, Frank},
  issn         = {0361-0128},
  journal      = {ECONOMIC GEOLOGY},
  keyword      = {COMPLEXES,CONGO,MINERALIZATION,KATANGA,BRINES,SOURCE MASS-SPECTROMETRY,COPPER,FRACTIONATION},
  language     = {eng},
  number       = {7},
  pages        = {1055--1064},
  title        = {Cu isotope ratio variations in the Dikulushi Cu-Ag deposit, DRC: of primary origin or induced by supergene reworking?},
  url          = {http://dx.doi.org/10.2113/gsecongeo.104.7.1055},
  volume       = {104},
  year         = {2009},
}

Chicago
Haest, Maarten, Philippe Muchez, Jérôme C Petit, and Frank Vanhaecke. 2009. “Cu Isotope Ratio Variations in the Dikulushi Cu-Ag Deposit, DRC: Of Primary Origin or Induced by Supergene Reworking?” Economic Geology 104 (7): 1055–1064.
APA
Haest, M., Muchez, P., Petit, J. C., & Vanhaecke, F. (2009). Cu isotope ratio variations in the Dikulushi Cu-Ag deposit, DRC: of primary origin or induced by supergene reworking? ECONOMIC GEOLOGY, 104(7), 1055–1064.
Vancouver
1.
Haest M, Muchez P, Petit JC, Vanhaecke F. Cu isotope ratio variations in the Dikulushi Cu-Ag deposit, DRC: of primary origin or induced by supergene reworking? ECONOMIC GEOLOGY. 2009;104(7):1055–64.
MLA
Haest, Maarten, Philippe Muchez, Jérôme C Petit, et al. “Cu Isotope Ratio Variations in the Dikulushi Cu-Ag Deposit, DRC: Of Primary Origin or Induced by Supergene Reworking?” ECONOMIC GEOLOGY 104.7 (2009): 1055–1064. Print.