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Petrology and Isotope Geochemistry of the Pan-African Negash Pluton, Northern Ethiopia: Mafic-Felsic Magma Interactions During the Construction of Shallow-level Calc-alkaline Plutons
Authors:ASRAT  A; BARBEY  P; LUDDEN  J N; REISBERG  L; GLEIZES  G; AYALEW  D
Institution:1 CRPG–CNRS, 15, RUE NOTRE-DAME DES PAUVRES, BP 20, 54501 VANDOEUVRE-LÈS-NANCY CEDEX, FRANCE
2 DEPARTMENT OF GEOLOGY AND GEOPHYSICS, ADDIS ABABA UNIVERSITY, PO BOX 1176, ADDIS ABABA, ETHIOPIA
3 CNRS–UMR 5563 LMTG, UNIVERSITÉ PAUL SABATIER, 38, RUE DES TRENTE-SIX PONTS, 31400 TOULOUSE, FRANCE
Abstract:The Negash pluton consists of monzogranites, granodiorites,hybrid quartz monzodiorites, quartz monzodiorites and pyroxenemonzodiorites, emplaced at 608 ± 7 Ma (zircon U–Pb)in low-grade volcaniclastic sediments. Field relationships betweenmafic and felsic rocks result from mingling and hybridizationat the lower interface of a mafic sheet injected into partiallycrystallized, phenocryst-laden, granodiorite magma (back-veining),and hybridization during simultaneous ascent of mafic and felsicmagmas in the feeder zone located to the NW of the pluton. Therock suite displays low 87Sr/86Sr(608) (0·70260–0·70350)and positive
Keywords:: mafic–  felsic intrusion  magma mingling  Ethiopia  Pan-African
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