Pb isotopic constraints on the formation of the Dikulushi Cu-Pb-Zn-Ag mineralisation, Kundelungu Plateau (Democratic Republic of Congo)
- Author
- Maarten Haest, Jens Schneider, Christophe Cloquet, Kris Latruwe (UGent) , Frank Vanhaecke (UGent) and Philippe Muchez
- Organization
- 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.
- Keywords
- 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
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Citation
Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-934572
- MLA
- Haest, Maarten, et al. “Pb Isotopic Constraints on the Formation of the Dikulushi Cu-Pb-Zn-Ag Mineralisation, Kundelungu Plateau (Democratic Republic of Congo).” MINERALIUM DEPOSITA, vol. 45, no. 4, 2010, pp. 393–410, doi:10.1007/s00126-010-0279-6.
- 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. https://doi.org/10.1007/s00126-010-0279-6
- Chicago author-date
- 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. https://doi.org/10.1007/s00126-010-0279-6.
- Chicago author-date (all authors)
- 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. doi:10.1007/s00126-010-0279-6.
- 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.
- IEEE
- [1]M. Haest, J. Schneider, C. Cloquet, K. Latruwe, F. Vanhaecke, and P. Muchez, “Pb isotopic constraints on the formation of the Dikulushi Cu-Pb-Zn-Ag mineralisation, Kundelungu Plateau (Democratic Republic of Congo),” MINERALIUM DEPOSITA, vol. 45, no. 4, pp. 393–410, 2010.
@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}}, keywords = {{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://doi.org/10.1007/s00126-010-0279-6}}, volume = {{45}}, year = {{2010}}, }
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