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- Title
Spinel Lherzolite of the Northern Kraka Massif (Southern Urals): The First REE ID‒ICP‒MS, <sup>87</sup>Sr‒<sup>86</sup>Sr, and <sup>147</sup>Sm‒<sup>143</sup>Nd AL ID-TIMS Isotope Constraints.
- Authors
Ronkin, Yu. L.; Chashchukhin, I. S.; Puchkov, V. N.
- Abstract
The results of study of the REE ID‒ICP‒MS, 86Sr/87Sr, and 147Sm‒143Nd AL ID-TIMS isotope systematics of spinel lherzolite from the Northern Kraka Massif, which is part of the largest (>900 km2) lherzolitic allochthon thrust over the bathyal and shelf deposits of the passive continental margin of the East European Platform, are reported. As a result, an isochron dependence (MSWD = 0.85) was revealed for the first time, which determines the age of 545 ± 26 Ma and the high value of the initial ratio (143Nd/144Nd)0 = 0.512390 ± 0.000054, corresponding to εNd = +8.9 within the model. The resulting REE, 87Sr/86Sr, and 147Sm–143Nd isotopic signatures indicate the melting of an already depleted protolith, which can be identified as a mantle source, with MORB-like parameters. The calculated isochron age of homogenization of the 147Sm–143Nd isotope system in combination with the available complex of geological and geochemical data allows us to place the Late Vendian phase (epoch) of folding and orogeny in the Urals in the interval of 545 ± 26 Ma. Comparison of these data with materials on the geology of Central and Western Europe allows us to correlate the Timanide structures formed as a result of this phase of folding with the Cadomian, which, based on global reconstructions of continents for the end of the Proterozoic, will ultimately authorize the hypothesis of the existence of the Cadomian orogeny on the periphery of Gondwana.
- Subjects
URAL Mountains (Russia); LHERZOLITE; GONDWANA (Continent); ISOTOPES; SPINEL; ISOTOPIC signatures; CONTINENTAL margins; ANTHROPOCENE Epoch; CONTINENTS; SAMARIUM
- Publication
Doklady Earth Sciences, 2024, Vol 514, Issue 1, p59
- ISSN
1028-334X
- Publication type
Article
- DOI
10.1134/S1028334X23602365