Isotope geochemistry (O, C, S, Sr) and Rb-Sr age of carbonatites in central Tuva

Никифоров, А. В.; Болонин, А. В.; Pokrovsky, B. G.; Сугоракова, А. М.; Чугаев, А. В.; Lykhin, D. A.

doi:10.1134/s1075701506040027

Cited by 24 publications

(10 citation statements)

References 10 publications

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“…In the majority of cases, the siderite carbonatite breccia matrix contains fragments of previously formed rocks such as ankerite-calcite carbonatites, magmatic rocks, and host country rocks. These geological characteristics unambiguously indicate that the sequence of formation of magmatic rocks in this region was alkaline-mafic magmatism (120-150 Ma, Ontonev 1984, Bolonin et al 2009) followed by ankerite-calcite carbonatites (118 ± 9 Ma, Nikiforov et al 2006), and then followed by siderite carbonatites (117.2 ± 1.3 Ma).…”

Section: Relationship Of Silicate Alkaline Rocks and Carbonatitesmentioning

confidence: 86%

“…The Rb-Sr age of the ankerite-calcite and siderite carbonatites of southern Siberia is 118 ± 9 Ma (Nikiforov et al 2006). Geological relationships have established that the siderite carbonatites were formed after the ankerite-calcite carbonatites.…”

Section: Geologymentioning

confidence: 98%

“…The 87 Sr/ 86 Sr isotope ratio (Nikiforov et al 2006) in calcite and ankerite (0.7042-0.7048), and siderite (0.7042-0.7045) of the carbonatites indicates a common mantle source for their formation. The O isotopic composition of quartz (δ 18 O = 11.2-13.7 ‰) and carbonates (δ 18 O = 8.8-14.7 ‰) confirms a magmatic origin for the carbonatites of southern Siberia.…”

Section: Mineralogymentioning

confidence: 99%

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Origin of REE-rich ferrocarbonatites in southern Siberia (Russia): implications based on melt and fluid inclusions

et al. 2016

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Fe-rich carbonatites with a mineral assemblage of ankerite-calcite or siderite are widespread in southern Siberia, Russia. The siderite carbonatites are associated with F-Ba-Sr-REE mineralization and have a 40 Ar/ 39 Ar age of 117.2 ± 1.3 Ma. Melt and fluid inclusions suggest that the carbonatites formed from volatile-rich alkali-and chloride-bearing carbonate melts. Ankeritecalcite carbonatites formed from carbonatite melt at a temperature of more than 790°C. The ferrocarbonatites (the second phase of carbonatite intrusion) formed from a sulfate-carbonate-chloride fluid phase (brine-melt) at >650°C and ≥360 MPa. The brine-melt fluid phase had high concentrations of Fe and LREEs. A subsequent hydrothermal overprint contributed to the formation of economically important barite-Sr-fluorite-REE mineralization in polymict siderite breccia.

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Section: Relationship Of Silicate Alkaline Rocks and Carbonatitesmentioning

confidence: 86%

Section: Geologymentioning

confidence: 98%

Section: Mineralogymentioning

confidence: 99%

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Origin of REE-rich ferrocarbonatites in southern Siberia (Russia): implications based on melt and fluid inclusions

et al. 2016

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“…This group is characterized by fractionation of apatite, calcite, and phlogopite, leading to a residual concentration of Ba, Mg, and Na, and the crystallization of carbonates 100.000 10.000 Taylor et al (1967) and for S by Deines (1989), Mitchell & Krouse (1975), Druppel et al (2006) and Nikiforov et al (2006). Arrows indicate changes expected in Rayleigh fractionation, low-temperature hydrothermal alteration without the participation of CO 2 and degassing (Taylor et al 1967, Ray & Ramesh 2000.…”

Section: Discussionmentioning

confidence: 99%

Stable (C, O, S) isotopes and whole-rock geochemistry of carbonatites from Alto Paranaíba Igneous Province, SE Brazil

et al. 2016

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ABSTRACT:The present work investigates the relationship between whole-rock geochemistry and stable isotope composition from carbonatites belonging to the Tapira, Araxá, Salitre, Serra Negra, Catalão I, and Catalão II alkaline-carbonatite complexes of the Alto Paranaiba Igneous Province (APIP), central Brazil and from the Jacupiranga Complex, of the Ponta Grossa Province, southeast Brazil. The APIP complexes are ultrapotassic, comprising bebedourites, phoscorites, nelsonites, and carbonatites, whereas Jacupiranga is a sodic complex composed of ijolite-series rocks, syenites, carbonatites, and alkaline gabbros. The geochemistry data allied to mineralogical constraints allowed us to classify the carbonatites into five groups, and to devise a chemical index (BaO/(BaO+SrO)) to gauge the magmatic evolution of the studied carbonatites.The APIP carbonatites evolve from apatite-rich calciocarbonatites toward Ba-, Sr-, and rare earth element (REE)-rich magnesiocarbonatites. This evolution is mostly driven by apatite, phlogopite, dolomite, and calcite fractionation and consequent enrichment in monazite, norsethite, and strontianite. Stable isotope data show a wide diversity of petrogenetic processes in play at the APIP, relatively to the Jacupiranga Complex, which is interpreted as a result of the shallower intrusion levels of the APIP complexes. Such shallower emplacement, at low lithostatic pressure, allowed for a complex interplay of fractional crystallization, liquid immiscibility, degassing, and interaction with hydrothermal and carbohydrothermal systems. KEYWORDS: INTRODUCTIONBrazilian alkaline provinces have been studied by a range of techniques such as whole-rock geochemistry, mineral chemistry, stable and radiogenic isotope geochemistry, with a range of petrogenetic aplications (Gomide et al. 2013, Barbosa 2009, Cordeiro et al. 2011, Grasso 2010, Ribeiro 2008, CominChiaramonti et al. 2001, Traversa 2001, Andrade et al. 2002, Huang et al. 1995, Santos & Clayton 1995, Ulbrich & Gomes 1981. We aim to contribute to the knowledge of carbonatite petrogenetic evolution, investigating the relationships between whole-rock geochemistry and stable isotope geochemistry data, reporting geochemical and isotopic data from carbonatites of the Late-Cretaceous Alto Paranaíba Igneous Province (APIP), and discuss their implications for magma evolution, both at single-complex and Province-wide scales. The results obtained are compared with the Early-Cretaceous Jacupiranga carbonatite complex, in the Ponta Grossa Province.Alkaline rocks and alkaline-carbonatite associations include highly variable petrographic types and correspondingly extensive nomenclature. We adopt the nomenclature proposed by Le Maitre et al. The APIP alkaline-carbonatite complexes are multistage intrusions formed by rocks derived from the bebedourite, carbonatite, and phoscorite series, which are related to each other by a complex interplay of fractional crystallization, liquid immiscibility, and degassing (Brod et al. 2004, Ribeiro 2008, Barbosa 2009, Cordeir...

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“…The Central Tuva carbonatite region contains several carbonatite occurrences, among which the Karasug carbonatite is the largest one and an ore field bearing REE-Ba-Sr-F-Fe deposit. 1,6 This carbonatite field is located in the Ordovician and Silurian rocks at the wall of the Devonian Tuva Trough. Carbonatites are represented by ankerite-calcite at the first intrusive phase and orebearing siderite at the second phase.…”

Section: Sample Backgroundmentioning

confidence: 99%

Bastnaesite K-9: A Homogenous Natural Reference Material For In-Situ U–Pb And Th–Pb Dating

Li¹

2020

At.Spectrosc.

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Bastnaesite, a major economic rare earth element (REE) mineral, has been considered to serve as a U-Th-Pb geochronometer to record REE mineralization time. As previously noted, most bastnaesite contains more Th than U, with Th/U ratios larger than 1000 in some cases, indicating Th-Pb dating is more suitable than U-Pb geochronometry. In-situ bastnaesite Th-Pb dating by laser-ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) method and Secondary Ion Mass Spectrometry (SIMS) has been performed. However, there is no independently determined, matrix matched Th-Pb bastnaesite reference material available. In this study, the bastnaesite "K-9" from Karasug siderite carbonatites (Tuva Republic) are evaluated as U-Pb and Th-Pb dating reference material by multiple methods. Major elements, including La, Ce, Pr, Nd, F is homogenous at < 5 wt% level (1 relative standard deviation, RSD) as verified by electron microprobe analyses (EMPA). SIMS U-Th-Pb dating results prove its homogeneity and concordance of both U-Pb and Th-Pb system at < 2% level (1 RSD). Based on six ID-IRMS (isotope dilution isotope ratio mass spectrometry) analyses, 206 Pb/ 238 U age of 116.80 ± 0.13 Ma and 208 Pb/ 232 Th age of 116.59 ± 0.11 Ma are provided as recommended age data. In summary, K-9 bastnaesite is qualified to serve as an in-situ U-Pb and Th-Pb dating reference material, and is expected to contribute significantly to the rapidly advancing bastnaesite geochronology in the coming future.

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Isotope geochemistry (O, C, S, Sr) and Rb-Sr age of carbonatites in central Tuva

Cited by 24 publications

References 10 publications

Origin of REE-rich ferrocarbonatites in southern Siberia (Russia): implications based on melt and fluid inclusions

Origin of REE-rich ferrocarbonatites in southern Siberia (Russia): implications based on melt and fluid inclusions

Stable (C, O, S) isotopes and whole-rock geochemistry of carbonatites from Alto Paranaíba Igneous Province, SE Brazil

Bastnaesite K-9: A Homogenous Natural Reference Material For In-Situ U–Pb And Th–Pb Dating

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