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Structure, petrology and geochemistry of the Abu Dom alkaline ring‐complex, Bayuda Desert, Sudan
Author(s) -
O'Halloran D. A.
Publication year - 1985
Publication title -
geological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.721
H-Index - 54
eISSN - 1099-1034
pISSN - 0072-1050
DOI - 10.1002/gj.3350200402
Subject(s) - peralkaline rock , geochemistry , geology , gneiss , proterozoic , petrogenesis , petrology , paleontology , metamorphic rock , basalt , volcano , tectonics
The Abu Dom complex is one of a cluster of Younger Granite ring‐complexes piercing the Proterozoic gneisses of the Bayuda Desert of Sudan. Intrusive rocks predominate and range from early metaluminous syenites to later peralkaline syenites and granites. They are disposed as ring‐dykes, nested intrusions, and cone‐sheet swarms. Field evidence and geochemical variation indicate that the peralkaline rocks evolved from a metaluminous syenitic parent magma as a result of high‐level fractionation. The suite carries a clear within‐plate signature exemplified by marked enrichments in HFS elements such as Zr and Nb.