Zircon and titanite age determinations from igneous rocks in the Karibib District, Namibia: implications for Navachab vein-style gold mineralization
SHRIMP U-Pb dating of single zircon grains from Damaran granitic rocks yielded ages of 550Ma and 540Ma for the Mon Repos diorite and Rotekuppe granite plutons respectively. Single titanite grains yielded a 500Ma metamorphic age for metalamprophyre and an identical age for quartz/skarn veins from the Navachab open pit. Aplite/pegmatite dykes that cut the mineralization give poor apparent ages between 540Ma and 565Ma with large errors. The timing of mineralization remains equivocal, either intrusive-related (550Ma), accepting the pegmatite model age, and subsequently reset by metamorphism, or directly metamorphic (500Ma).
Communications of the Geological Survey of Namibia
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