Lower Paleozoic oceanic crust in Mongolian Caledonides: SM-ND isotope and trace element data

1991 ◽  
Vol 18 (7) ◽  
pp. 1301-1304 ◽  
Author(s):  
P. K. Kepezhinskas ◽  
K. B. Kepezhinskas ◽  
I. S. Pukhtel
Keyword(s):  
Trace Element ◽  
Oceanic Crust ◽  
Trace Element Data ◽  
Lower Paleozoic ◽  
Nd Isotope ◽  
Element Data

Petrological features of olivine-phlogopite lamproites of the Sayan region: Evidence from Sr-Nd isotope and ICP-MS trace-element data

2006 ◽  
Vol 44 (7) ◽  
pp. 729-735 ◽  
Author(s):  
K. N. Egorov ◽  
L. V. Solov’eva ◽  
V. P. Kovach ◽  
Yu. V. Men’shagin ◽  
M. N. Maslovskaya ◽  
...  
Keyword(s):  
Trace Element ◽  
Trace Element Data ◽  
Nd Isotope ◽  
Element Data ◽  
Sayan Region ◽  
Icp Ms

scholarly journals Ore and Geochemical Specialization and Substance Sources of the Ural and Timan Carbonatite Complexes (Russia): Insights from Trace Element, Rb–Sr, and Sm–Nd Isotope Data

Minerals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 711
Author(s):  
Irina Nedosekova ◽  
Nikolay Vladykin ◽  
Oksana Udoratina ◽  
Boris Belyatsky
Keyword(s):  
Trace Element ◽  
Mantle Source ◽  
Crustal Evolution ◽  
Trace Element Data ◽  
The Urals ◽  
Nd Isotope ◽  
Enriched Mantle ◽  
Depleted Mantle ◽  
Mantle Sources ◽  
Geochemical Specialization

The Ilmeno–Vishnevogorsk (IVC), Buldym, and Chetlassky carbonatite complexes are localized in the folded regions of the Urals and Timan. These complexes differ in geochemical signatures and ore specialization: Nb-deposits of pyrochlore carbonatites are associated with the IVC, while Nb–REE-deposits with the Buldym complex and REE-deposits of bastnäsite carbonatites with the Chetlassky complex. A comparative study of these carbonatite complexes has been conducted in order to establish the reasons for their ore specialization and their sources. The IVC is characterized by low 87Sr/86Sri (0.70336–0.70399) and εNd (+2 to +6), suggesting a single moderately depleted mantle source for rocks and pyrochlore mineralization. The Buldym complex has a higher 87Sr/86Sri (0.70440–0.70513) with negative εNd (−0.2 to −3), which corresponds to enriched mantle source EMI-type. The REE carbonatites of the Chetlassky сomplex show low 87Sr/86Sri (0.70336–0.70369) and a high εNd (+5–+6), which is close to the DM mantle source with ~5% marine sedimentary component. Based on Sr–Nd isotope signatures, major, and trace element data, we assume that the different ore specialization of Urals and Timan carbonatites may be caused not only by crustal evolution of alkaline-carbonatite magmas, but also by the heterogeneity of their mantle sources associated with different degrees of enrichment in recycled components.

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