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The ITSAQ Gneiss Complex of Greenland: Episodic 3900 to 3660 Ma Juvenile Crust Formation and Recycling in the 3660 to 3600 Ma Isukasian Orogeny

Nutman, Allen P.; Bennett, Victoria; Friend, Clark; Hidaka, H.; Keewook, Yi; Lee, Seung Ryeol; Kamiichi, Tomoyuki


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]

CollectionsANU Research Publications
Date published: 2013
Type: Journal article
Source: American Journal of Science
DOI: 10.2475/09.2013.03


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