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- Title
Petrogenesis and Tectonic Implications of the Cryogenian I-Type Granodiorites from Gabgaba Terrane (NE Sudan).
- Authors
Sami, Mabrouk; Adam, Munir M. A.; Lv, Xinbiao; Lasheen, El Saeed R.; Ene, Antoaneta; Zakaly, Hesham M. H.; Alarifi, Saad S.; Mahdy, Nasser M.; Abdel Rahman, Abdel Rahman A.; Saeed, Adil; Farahat, Esam S.; Fathy, Douaa; Ali, Shehata
- 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.
- Subjects
SUDAN; PETROGENESIS; GEOCHEMISTRY; ZIRCON; BIOTITE; AMPHIBOLES
- Publication
Minerals (2075-163X), 2023, Vol 13, Issue 3, p331
- ISSN
2075-163X
- Publication type
Article
- DOI
10.3390/min13030331