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International Journal of Earth Sciences

, Volume 102, Issue 1, pp 183–205 | Cite as

Cenozoic intra-plate magmatism in the Darfur volcanic province: mantle source, phonolite-trachyte genesis and relation to other volcanic provinces in NE Africa

  • Friedrich Lucassen
  • Dieter Pudlo
  • Gerhard Franz
  • Rolf L. Romer
  • Peter Dulski
Original Paper

Abstract

Chemical and Sr, Nd and Pb isotopic compositions of Late Cenozoic to Quaternary small-volume phonolite, trachyte and related mafic rocks from the Darfur volcanic province/NW-Sudan have been investigated. Isotope signatures indicate variable but minor crustal contributions. Some phonolitic and trachytic rocks show the same isotopic composition as their primitive mantle-derived parents, and no crustal contributions are visible in the trace element patterns of these samples. The magmatic evolution of the evolved rocks is dominated by crystal fractionation. The Si-undersaturated strongly alkaline phonolite and the Si-saturated mildly alkaline trachyte can be modelled by fractionation of basanite and basalt, respectively. The suite of basanite–basalt–phonolite–trachyte with characteristic isotope signatures from the Darfur volcanic province fits the compositional features of other Cenozoic intra-plate magmatism scattered in North and Central Africa (e.g., Tibesti, Maghreb, Cameroon line), which evolved on a lithosphere that was reworked or formed during the Neoproterozoic.

Keywords

NE Africa Darfur volcanic province Basanite Trachyte Phonolite Lithospheric mantle 

Notes

Acknowledgments

Sampling for this study was undertaken in course of the research project SFB 69 in the years 1984–1988, and we thank all participants of the expeditions for their help, especially our colleagues from Geological Research Authorities of Sudan in Khartoum. F.L. thanks the former technical staff of the radiogenic isotope facility at GFZ Cathrin Schulz and Anette Meixner for their technical support over many years. Birgit Zander is thanked for help with the ICP-MS analyses at GFZ. We thank Gerhard Wörner for his helpful review. The study was supported by DFG grant number FR 557/20-1.

Supplementary material

531_2012_792_MOESM1_ESM.xls (166 kb)
Table 1 Geochemical composition (XLS 165 kb)
531_2012_792_MOESM2_ESM.pdf (1002 kb)
Supplementary material 2 (PDF 1,002 kb)

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Friedrich Lucassen
    • 1
    • 2
    • 3
  • Dieter Pudlo
    • 4
  • Gerhard Franz
    • 2
  • Rolf L. Romer
    • 3
  • Peter Dulski
    • 3
  1. 1.Isotope Geochemistry Group, Department of Geosciences and MARUM Center for Marine Environmental SciencesUniversity of BremenBremenGermany
  2. 2.Fachgebiet Mineralogie-PetrologieTU BerlinBerlinGermany
  3. 3.Deutsches GeoForschungsZentrum, TelegrafenbergPotsdamGermany
  4. 4.Faculty of Chemistry and Earth Sciences, Institute of Earth SciencesFriedrich-Schiller-Universität JenaJenaGermany

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