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Pb isotopic constraints on the formation of the Dikulushi Cu-Pb-Zn-Ag mineralisation, Kundelungu Plateau (Democratic Republic of Congo)

Maarten Haest, Jens Schneider, Christophe Cloquet, Kris Latruwe UGent, Frank Vanhaecke UGent and Philippe Muchez (2010) MINERALIUM DEPOSITA. 45(4). p.393-410
abstract
Base metal-Ag mineralisation at Dikulushi and in other deposits on the Kundelungu Plateau (Democratic Republic of Congo) developed during two episodes. Subeconomic Cu-Pb-Zn-Fe polysulphide ores were generated during the Lufilian Orogeny (c. 520 Ma ago) in a set of E-W- and NE-SW-oriented faults. Their lead has a relatively unradiogenic and internally inhomogeneous isotopic composition (Pb-206/Pb-204 = 18.07-18.49), most likely generated by mixing of Pb from isotopically heterogeneous clastic sources. These sulphides were remobilised and enriched after the Lufilian Orogeny, along reactivated and newly formed NE-SW-oriented faults into a chalcocite-dominated Cu-Ag mineralisation of high economic interest. The chalcocite samples contain only trace amounts of lead and show mostly radiogenic Pb isotope signatures that fall along a linear trend in the Pb-207/Pb-204 vs. Pb-206/Pb-204 diagram (Pb-206/Pb-204 = 18.66-23.65; Pb-207/Pb-204 = 15.72-16.02). These anomalous characteristics reflect a two-stage evolution involving admixture of both radiogenic lead and uranium during a young fluid event possibly c. 100 Ma ago. The Pb isotope systematics of local host rocks to mineralisation also indicate some comparable young disturbance of their U-Th-Pb systems, related to the same event. They could have provided Pb with sufficiently radiogenic compositions that was added to less radiogenic Pb remobilised from precursor Cu-Pb-Zn-Fe polysulphides, whereas the U most likely originated from external sources. Local metal sources are also suggested by the Pb-208/Pb-204-Pb-206/Pb-204 systematics of combined ore and rock lead, which indicate a pronounced and diversified lithological control of the immediate host rocks on the chalcocite-dominated Cu-Ag ores. The Pb isotope systematics of polysulphide mineralisation on the Kundelungu Plateau clearly record a diachronous evolution.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
LUFILIAN FORELAND, KATANGA SUPERGROUP, ICP-MS, Lufilian Arc, NORTHERN SWEDEN, Polysulphide vein-type mineralisation, Lead isotopes, Dikulushi Cu-Ag deposit, NEOPROTEROZOIC NGUBA, CENTRAL AFRICAN COPPERBELT, LEAD-ISOTOPE, DEPOSIT, ZAMBIA, BELT
journal title
MINERALIUM DEPOSITA
Miner. Depos.
volume
45
issue
4
pages
18 pages
Web of Science type
Article
Web of Science id
000276065500006
JCR category
MINERALOGY
JCR impact factor
2.061 (2010)
JCR rank
6/27 (2010)
JCR quartile
1 (2010)
ISSN
0026-4598
DOI
10.1007/s00126-010-0279-6
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
934572
handle
http://hdl.handle.net/1854/LU-934572
date created
2010-04-21 14:00:54
date last changed
2010-04-28 15:17:42
@article{934572,
  abstract     = {Base metal-Ag mineralisation at Dikulushi and in other deposits on the Kundelungu Plateau (Democratic Republic of Congo) developed during two episodes. Subeconomic Cu-Pb-Zn-Fe polysulphide ores were generated during the Lufilian Orogeny (c. 520 Ma ago) in a set of E-W- and NE-SW-oriented faults. Their lead has a relatively unradiogenic and internally inhomogeneous isotopic composition (Pb-206/Pb-204 = 18.07-18.49), most likely generated by mixing of Pb from isotopically heterogeneous clastic sources. These sulphides were remobilised and enriched after the Lufilian Orogeny, along reactivated and newly formed NE-SW-oriented faults into a chalcocite-dominated Cu-Ag mineralisation of high economic interest. The chalcocite samples contain only trace amounts of lead and show mostly radiogenic Pb isotope signatures that fall along a linear trend in the Pb-207/Pb-204 vs. Pb-206/Pb-204 diagram (Pb-206/Pb-204 = 18.66-23.65; Pb-207/Pb-204 = 15.72-16.02). These anomalous characteristics reflect a two-stage evolution involving admixture of both radiogenic lead and uranium during a young fluid event possibly c. 100 Ma ago. The Pb isotope systematics of local host rocks to mineralisation also indicate some comparable young disturbance of their U-Th-Pb systems, related to the same event. They could have provided Pb with sufficiently radiogenic compositions that was added to less radiogenic Pb remobilised from precursor Cu-Pb-Zn-Fe polysulphides, whereas the U most likely originated from external sources. Local metal sources are also suggested by the Pb-208/Pb-204-Pb-206/Pb-204 systematics of combined ore and rock lead, which indicate a pronounced and diversified lithological control of the immediate host rocks on the chalcocite-dominated Cu-Ag ores. The Pb isotope systematics of polysulphide mineralisation on the Kundelungu Plateau clearly record a diachronous evolution.},
  author       = {Haest, Maarten and Schneider, Jens and Cloquet, Christophe and Latruwe, Kris and Vanhaecke, Frank and Muchez, Philippe},
  issn         = {0026-4598},
  journal      = {MINERALIUM DEPOSITA},
  keyword      = {LUFILIAN FORELAND,KATANGA SUPERGROUP,ICP-MS,Lufilian Arc,NORTHERN SWEDEN,Polysulphide vein-type mineralisation,Lead isotopes,Dikulushi Cu-Ag deposit,NEOPROTEROZOIC NGUBA,CENTRAL AFRICAN COPPERBELT,LEAD-ISOTOPE,DEPOSIT,ZAMBIA,BELT},
  language     = {eng},
  number       = {4},
  pages        = {393--410},
  title        = {Pb isotopic constraints on the formation of the Dikulushi Cu-Pb-Zn-Ag mineralisation, Kundelungu Plateau (Democratic Republic of Congo)},
  url          = {http://dx.doi.org/10.1007/s00126-010-0279-6},
  volume       = {45},
  year         = {2010},
}

Chicago
Haest, Maarten, Jens Schneider, Christophe Cloquet, Kris Latruwe, Frank Vanhaecke, and Philippe Muchez. 2010. “Pb Isotopic Constraints on the Formation of the Dikulushi Cu-Pb-Zn-Ag Mineralisation, Kundelungu Plateau (Democratic Republic of Congo).” Mineralium Deposita 45 (4): 393–410.
APA
Haest, M., Schneider, J., Cloquet, C., Latruwe, K., Vanhaecke, F., & Muchez, P. (2010). Pb isotopic constraints on the formation of the Dikulushi Cu-Pb-Zn-Ag mineralisation, Kundelungu Plateau (Democratic Republic of Congo). MINERALIUM DEPOSITA, 45(4), 393–410.
Vancouver
1.
Haest M, Schneider J, Cloquet C, Latruwe K, Vanhaecke F, Muchez P. Pb isotopic constraints on the formation of the Dikulushi Cu-Pb-Zn-Ag mineralisation, Kundelungu Plateau (Democratic Republic of Congo). MINERALIUM DEPOSITA. 2010;45(4):393–410.
MLA
Haest, Maarten, Jens Schneider, Christophe Cloquet, et al. “Pb Isotopic Constraints on the Formation of the Dikulushi Cu-Pb-Zn-Ag Mineralisation, Kundelungu Plateau (Democratic Republic of Congo).” MINERALIUM DEPOSITA 45.4 (2010): 393–410. Print.