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Regional Geology and Metallogeny
Journal Contents
2019
78

N.I. GUSEV, L.YU. SERGEEVA (VSEGEI), S.G. SKUBLOV (IGGD RAS, SPGU)

Evidence of the reworked Eoarchean crust in the Anabar Shield (Siberian Craton)

Paleoarchean (3.4 Ga) anatectic tonalite-granodiorite plagiogneiss hosts xenoliths of mafic (metagabbro) and plagioclase (metamonzodiorite) rocks. Xenoliths are characterized by TNd(DM) = 3.65 to 3.67 Ga and contain Eoarchean zircon: in mafic schist, zircon discordant analyses give upper intersections of 3987 ± 71 to 3599 ± 33 Ma; in plagioclase schist, the age of zircon is 3631 ± 5 Ma. Xenoliths are considered as remnants of the Eoarchean mafic crust.
Keywords: Anabar Shield, Daldyn Group, Eoarchean, Paleoarchean, granulite, zircon, U-Pb age SHRIMP II, Sm-Nd systematics.

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