Evidence of the reworked Eoarchean crust in the Anabar Shield (Siberian Craton)
Abstract
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.
About the Authors
N. I. Gusev
A. P. Karpinsky Russian Geological Research Institute (VSEGEI)
Russian Federation
Russian Federation
Head of Department
L. Yu. Sergeeva
A. P. Karpinsky Russian Geological Research Institute (VSEGEI)
Russian Federation
Russian Federation
Engineer
S. G. Skublov
RAS Institute of the Precambrian Geology and Geochronology (IGGD RAS); Saint-Petersburg Mining University (SPGU)
Russian Federation
Russian Federation
Doctor of Geological and Mineralogical Sciences, Chief Researcher; Professor
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Review
For citations:
Gusev N.I., Sergeeva L.Yu., Skublov S.G. Evidence of the reworked Eoarchean crust in the Anabar Shield (Siberian Craton). Regional Geology and Metallogeny. 2019;(78):40–57. (In Russ.)
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