Sapphirine-Bearing Ultrahigh-Temperature Granulites of the Anabar Shield: Chemical Composition, U–Pb Zircon Ages, and P–T Conditions of Metamorphism
- Authors: Nozhkin A.D.1, Likhanov I.I.1, Savko K.A.2, Reverdatto V.V.1, Krylov A.A.1
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Affiliations:
- Sobolev Institute of Geology and Mineralogy, Siberian Branch
- Voronezh State University
- Issue: Vol 479, No 1 (2018)
- Pages: 347-351
- Section: Geochemistry
- URL: https://journals.rcsi.science/1028-334X/article/view/192485
- DOI: https://doi.org/10.1134/S1028334X18030078
- ID: 192485
Cite item
Abstract
The results of thermobarometry yielded the P–T parameters of formation and evolution of sapphirine- bearing granulites in the Anabar shield with peak values of UHT metamorphism in the range of T = 920–1000°C at P = 9–11 kbar. Isotope–geochronological data indicate a polymetamorphic evolution of these rocks. Detrital zircon cores in the center of crystals yielded ages of 3.36, 2.75, 2.6, and 2.5 Ga. Later, superimposed metamorphic transformations of the detrital zircon formed rims dated to 2.4, 2.3, 2.2, and 1.83 Ga. A potential provenance source of the detrital zircons could be hypersthene plagiogneisses and metabasics of the Daldyn Group with a premetamorphic age no less than 3.32 Ga and products of their metamorphism of about 2.7 Ga old.
About the authors
A. D. Nozhkin
Sobolev Institute of Geology and Mineralogy, Siberian Branch
Email: likh@igm.nsc.ru
Russian Federation, Novosibirsk, 630090
I. I. Likhanov
Sobolev Institute of Geology and Mineralogy, Siberian Branch
Author for correspondence.
Email: likh@igm.nsc.ru
Russian Federation, Novosibirsk, 630090
K. A. Savko
Voronezh State University
Email: likh@igm.nsc.ru
Russian Federation, Voronezh
V. V. Reverdatto
Sobolev Institute of Geology and Mineralogy, Siberian Branch
Email: likh@igm.nsc.ru
Russian Federation, Novosibirsk, 630090
A. A. Krylov
Sobolev Institute of Geology and Mineralogy, Siberian Branch
Email: likh@igm.nsc.ru
Russian Federation, Novosibirsk, 630090