Petrogenesis and Tectonic Implications of the Cryogenian I-Type Granodiorites from Gabgaba Terrane (NE Sudan)

Mabrouk Sami, Munir M.A. Adam, Xinbiao Lv, El Saeed R. Lasheen, Antoaneta Ene, Hesham M.H. Zakaly, Saad S. Alarifi, Nasser M. Mahdy, Abdel Rahman A. Abdel Rahman, Adil Saeed, Esam S. Farahat, Douaa Fathy, Shehata Ali

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

The widely distributed granitic intrusions in the Nubian Shield can provide comprehensive data for understanding its crustal evolution. We present new bulk-rock geochemistry and isotopic (zircon U-Pb and Lu-Hf) data from the Haweit granodiorites in the Gabgaba Terrane (NE Sudan). The dated zircons presented a 206Pb/238U Concordia age of 718.5 ± 2.2 Ma, indicating that they crystallized during the Cryogenian. The granodiorites contain both biotite and amphibole as the main mafic constituents. The samples exhibit metaluminous (A/CNK = 0.84–0.94) and calc-alkaline signatures. Their mineralogical composition and remarkable low P2O5, Zr, Ce, and Nb concentrations confirm that they belong to I-type granites. They exhibit subduction-related magma geochemical characters such as enrichment in LILEs and LREEs and depletion in HFSEs and HREEs, with a low (La/Yb)N ratio (3.0–5.9) and apparent negative Nb anomaly. The positive Hf(t) values (+7.34 to +11.21) and young crustal model age (TDMC = 734–985 Ma) indicates a juvenile composition of the granodiorites. The data suggest that the Haweit granodiorites may have formed from partially melting a juvenile low-K mafic source. During subduction, the ascending asthenosphere melts might heat and partially melt the pre-existing lower crust mafic materials to generate the Haweit granodiorites in the middle segment of the Nubian Shield.

Original languageEnglish
Article number331
JournalMinerals
Volume13
Issue number3
DOIs
Publication statusPublished - Mar 2023
Externally publishedYes

Keywords

  • Cryogenian
  • Gabgaba Terrane
  • I-type granite
  • NE Sudan
  • partial melting
  • zircon U-Pb-Lu-Hf isotopes

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geology

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