The ITSAQ Gneiss Complex of Greenland: Episodic 3900 to 3660 Ma Juvenile Crust Formation and Recycling in the 3660 to 3600 Ma Isukasian Orogeny
From the 3000 km2 Eoarchean Itsaq Gneiss Complex (IGC) of Greenland, zircon U-Pb dating of numerous meta-granitoid and orthogneiss samples is integrated with geologic observations, whole rock geochemistry and a strategic subset of zircon Hf and whole rock Nd isotopic measurements. This shows that there are multiple episodes of TTG suite formation from ∼3890 to 3660 Ma, characterized by zircon initial εHf≈0 and whole rock initial εNd of > +2. These rocks mostly have geochemical signatures of...[Show more]
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|Source:||American Journal of Science|
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