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- Title
Age Boundary of the Upper Precambrian Basal Rocks of the Polar Urals: Results of U–Pb (LA-ICP-MS) Dating of Zircon.
- Authors
Pystin, A. M.; Grakova, O. V.; Pystina, Yu. I.; Khubanov, V. B.; Popvasev, K. S.; Kushmanova, E. V.; Potapov, I. L.
- Abstract
The lower age boundary of the Upper Precambrian basal sequences of the Polar Urals (Nyarovei Group) is determined on the basis of mass U–Pb (LA-ICP-MS) dating of detrital zircon. The upper boundary of the basal sequence is determined from U–Pb (LA-ICP-MS) dating of zircon from overlapping volcanic rocks of the Nemyurgan Formation. It is thus established that the Nyarovei Group formed during a narrow period in the end of the Late Riphean (~750–650 Ma). The recognition of the group as a Middle Riphean straton is erroneous. A dominant role in the formation of the Nyarovei Group was played by erosion products of adjacent blocks of crystalline rocks, the fragments of which probably include the polymetamorphic complexes in the Kharbei–Marunkeu Anticlinorium of the Polar Urals.
- Subjects
ZIRCON; LASER ablation inductively coupled plasma mass spectrometry; PRECAMBRIAN; CRYSTALLINE rocks; VOLCANIC ash, tuff, etc.; GROUP formation; EROSION; PALEOGEOGRAPHY
- Publication
Doklady Earth Sciences, 2024, Vol 514, Issue 1, p1
- ISSN
1028-334X
- Publication type
Article
- DOI
10.1134/S1028334X2360247X