Formation Conditions of Ferromagnesian Metasomatic Carbonates in the Lower Riphean Terrigenous–Carbonate Rocks of the Southern Urals

Крупенин, М. Т.; Michurin, S. V.; Шарипова, А.А.; Garaeva, A. A.; Zamyatina, D. A.; Gulyaeva, T.L.

doi:10.1134/s0024490219030040

Cited by 3 publications

(3 citation statements)

References 17 publications

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“…However, according to the Sm-Nd data, the formation of magnesite occurred at the end of the Middle Riphean, 1250 Ma (Krupenin et al , 2016). In addition, a breinerite body (up to 20.5% FeO) was found in the same limestone unit, 10 km to the south from Ismakaevo (Krupenin et al, 2019).…”

Section: Discussionmentioning

confidence: 85%

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The Source of Ore Fluids and Sm–Nd Age of Siderite from the Largest Bakal Deposit, Southern Urals

et al. 2021

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Abstract— Based on Sm–Nd data, a crustal source of iron-ore fluid was substantiated and the probability of age estimation for hydrothermal–metasomatic siderite of the Bakal Group, Southern Urals, was shown for the first time. The εNd (Т) values of siderite (from –13.4 to –17.6) plot in the field of Riphean shale and not the Precambrian rift gabbro and granite of this region. The obtained Sm–Nd age of the Bakal siderite is 970 ± 40 Ma, which is consistent with the Pb–Pb age of siderite from the major ore phase (~1000 Ma). The established age boundary coincides with tectonic restructuring, including the formation of a number of barite–polymetallic deposits, as well as ferruginous magnesite and fluorite in the Riphean deposits on the western slope of the Southern Urals.

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Section: Discussionmentioning

confidence: 85%

“…Long-term interaction of brines with terrigenous-shale rocks in a catagenetic basin leads to a change in their composition to the ferruginous-magnesian. As a result, the formation of metasomatic Femagnesites and breinerites is probable (Krupenin and Kol'tsov, 2017;Krupenin et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

The Source of Ore Fluids and Sm–Nd Age of Siderite from the Largest Bakal Deposit, Southern Urals

et al. 2021

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“…Negative Ce anomalies are well known from many Neoproterozoic Chinese localities (S. Chen et al., 2014). Data on Neoproterozoic phosphate is less common, but examples of substantial negative Ce anomalies, down to 0.6, exist from China (Xin et al., 2015, 2016) and elsewhere (Frei et al., 2017; Gómez‐Peral et al., 2014, 2017; Krupenin et al., 2023; Mazumdar et al., 2003; Shields & Stille, 1998). Although these Ce anomalies are much weaker than modern anomalies which reach negative anomalies of up to 0.1, they still denote that up to 40% of the Ce is missing from these deposits.…”

Section: Discussionmentioning

confidence: 99%

A Global Marine Sediment Compilation and a Cerium Anomaly Perspective on Metasomatized Mantle Sources for REE‐Mineralized Carbonatites

Anenburg,

Liu

2024

JGR Solid Earth

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Rare earth elements (REE) are vital for powerful permanent magnets used in electric motors and wind turbines. These elements are chiefly sourced from carbonatites and their weathering products. The economic attractiveness of carbonatites is explained by the 10,000‐fold enrichment of REE in their mineralized portions relative to the average continental crust. Carbonatites form from mantle‐derived melts, but the ultimate origin of their REE is not completely clear. One widely cited model invokes subduction of marine sediments which accumulate REE‐rich material, priming the mantle to produce REE‐rich carbonatite melts which subsequently form deposits in the upper crust. Here we examine a global marine sediment compilation, revealing a wide variety in REE abundances and patterns. We use the sensitive lambda method that separates REE pattern curvature from redox‐related element anomalies to examine both marine sediments and presumably derived carbonatite rocks. We find that the most REE‐rich marine sediments are characterized by strongly negative Ce anomalies, which if recycled via subduction, mineralized carbonatites are expected to inherit. In contrast, we find that mineralized carbonatite rocks do not contain Ce anomalies. This indicates that the REE from the most REE‐rich marine sediments are not recycled into carbonatite deposits, and a different REE source is needed to explain carbonatite fertilities. We also find evidence that raises questions on whether any sediment‐derived REE are present in carbonatite deposits to a significant amount. We suggest that a REE‐rich source may not be required and REE enrichment occurs primarily during crustal magmatic differentiation.

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Non-destructive estimation of the cation composition of natural carbonates by micro-Raman spectroscopy

Urashima

Morita

Komatani

et al. 2023

Analytica Chimica Acta

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Formation Conditions of Ferromagnesian Metasomatic Carbonates in the Lower Riphean Terrigenous–Carbonate Rocks of the Southern Urals

Cited by 3 publications

References 17 publications

The Source of Ore Fluids and Sm–Nd Age of Siderite from the Largest Bakal Deposit, Southern Urals

The Source of Ore Fluids and Sm–Nd Age of Siderite from the Largest Bakal Deposit, Southern Urals

A Global Marine Sediment Compilation and a Cerium Anomaly Perspective on Metasomatized Mantle Sources for REE‐Mineralized Carbonatites

Non-destructive estimation of the cation composition of natural carbonates by micro-Raman spectroscopy

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