LREE–Nb Mineralization in the South Western Part of Ambadongar Carbonatite Complex, Chhota Udepur District, Gujarat, India

Nagabhushanam, B.; Raju, SM; Mundra, K. L.; D., S.; Purohit, Ritesh; Verma, M.B.; Nanda, L. K.

doi:10.18520/cs/v114/i08/1608-1610

Cited by 13 publications

(6 citation statements)

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“…revealed exposures of sövite, ankeritic, and carbonatite breccia beneath the basalts (Nagabhushanam et al, 2018), which supports a younger stratigraphic age for the inner basalts and further illustrates the controversy on the chronology of the basalts and the carbonatite exposures at Amba Dongar.…”

mentioning

confidence: 61%

“…However, Ray, Pande, and Pattanayak () dated the inner basalts and found them to be older than the carbonatites and regional Deccan volcanism (whole‐rock 40 Ar– 39 Ar age of 68.5 ± 0.9 Ma from a single sample). Recently, drill core (160 m drilled depth) obtained from the inner basalt sequence (1.5 to 22 m thick) revealed exposures of sövite, ankeritic, and carbonatite breccia beneath the basalts (Nagabhushanam et al, ), which supports a younger stratigraphic age for the inner basalts and further illustrates the controversy on the chronology of the basalts and the carbonatite exposures at Amba Dongar.…”

Section: Geology and Geochronology Of Amba Dongar Carbonatites And Rementioning

confidence: 92%

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Composition and U—Pb ages of apatite in the Amba Dongar carbonatite–alkaline complex, India

et al. 2018

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The Amba Dongar carbonatite‐alkaline complex is regarded as a late phase intrusion (ca. 65 Ma) associated with Deccan volcanism. Existing age constraints on the Amba Dongar carbonatite are based on phlogopite 40Ar–39Ar plateau ages derived from carbonatite and associated alkaline rocks within the complex. We explore the utility of apatite, a common accessory mineral in Amba Dongar carbonatites, as a petrogenetic and geochronological tool to constrain further the evolution of the carbonatites. Apatite exhibits different crystal forms—from hexagonal stubby prisms to ovoid and elongate grains. Apatite occurs as cumulate and disseminated grains that are either primary, fractured, or recrystallized. SrO content is high in primary apatite (3.17 wt%) but less in recrystallized (1.90 wt%) and disseminated grains (0.47 wt%). MnO and Cl are negligible while FeO is typically low in all samples. SiO2 content is low except for a few primary grains which measure up to 1.35 wt%, correlating with high REE content. LREEs dominate the total REE budget of Amba Dongar apatite, with HREEs below EPMA detection limit in most samples. Total REE content is generally low, though some primary apatite contains up to 3.19 wt% REEs. We also report UPb apatite ages from the carbonatites analysed in situ by LA‐ICP‐MS. The data from all samples combined on a UPb Tera–Wasserburg concordia yield a lower intercept age of 65.4 ± 2.5 Ma (MSWD = 2.8, 207Pb/206Pbi = 0.8272 ± 0.0028), and the Amba Dongar carbonatites are thus interpreted to represent a phase of coeval magmatic activity with Deccan volcanism.

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mentioning

confidence: 61%

Section: Geology and Geochronology Of Amba Dongar Carbonatites And Rementioning

confidence: 92%

Composition and U—Pb ages of apatite in the Amba Dongar carbonatite–alkaline complex, India

et al. 2018

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“…Therefore, rare earth carbonatites are a major focus of critical metal research. Over the past five years, several dozens of papers have been published on the subject of rare earth carbonatites (RE carbonatites) in Angola [5,6], Australia [7][8][9], Brazil [10,11], Canada [12][13][14][15][16][17], China [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37], Finland [38], India [39][40][41][42], Italy [43,44], Malawi [45][46][47][48][49][50][51], Mongolia [52,53], Namibia…”

Section: Introductionmentioning

confidence: 99%

The Petyayan-Vara Carbonatite-Hosted Rare Earth Deposit (Vuoriyarvi, NW Russia): Mineralogy and Geochemistry

et al. 2020

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The Vuoriyarvi Devonian carbonatite–ijolite–pyroxenite–olivinite complex comprises several carbonatite fields: Neske Vara, Tukhta-Vara, and Petyayan-Vara. The most common carbonatites in the Tukhta-Vara and Neske-Vara fields are calciocarbonatites, which host several P, Fe, Nb, and Ta deposits. This paper focuses on the Petyayan-Vara field, in which the primary magmatic carbonatites are magnesian. The least altered magnesiocarbonatites are composed of dolomite with burbankite and are rich in REE (up to 2.0 wt. %), Sr (up to 1.2 wt. %), and Ba (up to 0.8 wt. %). These carbonatites underwent several stages of metasomatism. Each metasomatic event produced a new rock type with specific mineralization. The introduction of K, Si, Al, Fe, Ti, and Nb by a F-rich fluid (or fluid-saturated melt) resulted in the formation of high-Ti magnesiocarbonatites and silicocarbonatites, composed of dolomite, microcline, Ti-rich phlogopite, and Fe–Ti oxides. Alteration by a phosphate–fluoride fluid caused the crystallization of apatite in the carbonatites. A sulfate-rich Ba–Sr–rare-earth elements (REE) fluid (probably brine-melt) promoted the massive precipitation of ancylite and baryte and, to a lesser extent, strontianite, bastnäsite, and synchysite. Varieties of carbonatite that contain the highest concentrations of REE are ancylite-dominant. The influence of sulfate-rich Ba-Sr-REE fluid on the apatite-bearing rocks resulted in the dissolution and reprecipitation of apatite in situ. The newly formed apatite generation is rich in HREE, Sr, and S. During late-stage transformations, breccias of magnesiocarbonatites with quartz-bastnäsite matrixes were formed. Simultaneously, strontianite, quartz, calcite, monazite, HREE-rich thorite, and Fe-hydroxides were deposited. Breccias with quartz-bastnäsite matrix are poorer in REE (up to 4.5 wt. % total REE) than the ancylite-dominant rocks (up to 11 wt. % total REE).

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“…The Amba Dongar carbonatites host significant resources of fluorite, REE, P, Ba, Sr and Nb (Palmer and Williams-Jones, 1996;Nanda et al, 2017;Nagabhushanam et al, 2018). Exploration of the Amba Dongar carbonatites indicated homogeneous mineralisation down to the explored vertical depth of 120-200 m in calcite and ankerite carbonatites, and carbonatite breccia as well (Krishnamurthy, 2019).…”

Section: Introductionmentioning

confidence: 98%

“…Considerable economic concentrations of pyrochlore are found in the Newania, Sevathur, Sung Valley, and Samchampi carbonatite complexes (Viladkar, 1998; Viladkar and Ghose, 2002; Melluso et al , 2010; Sadiq et al , 2014; Viladkar and Bismayer, 2014; Viladkar et al , 2017; Hoda and Krishnamurthy, 2020; Randive and Meshram, 2020). The Amba Dongar, Sevathur [also known as Sevattur], Koratti, Jogipatti, Samalpatti and Pakkanadu carbonatites are potential targets for locating REE, Nb, U and Th resources (Viladkar, 1981; Viladkar and Bismayer, 2010; Viladkar and Bismayer, 2014; Nagabhushanam et al , 2018). The Amba Dongar carbonatites host significant resources of fluorite, REE, P, Ba, Sr and Nb (Palmer and Williams-Jones, 1996; Nanda et al , 2017; Nagabhushanam et al , 2018).…”

Section: Introductionmentioning

confidence: 99%

Evolution of pyrochlore in carbonatites of the Amba Dongar complex, India.

Viladkar

Sorokhtina

2021

MinMag

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LREE–Nb Mineralization in the South Western Part of Ambadongar Carbonatite Complex, Chhota Udepur District, Gujarat, India

Cited by 13 publications

References 4 publications

Composition and U—Pb ages of apatite in the Amba Dongar carbonatite–alkaline complex, India

Composition and U—Pb ages of apatite in the Amba Dongar carbonatite–alkaline complex, India

The Petyayan-Vara Carbonatite-Hosted Rare Earth Deposit (Vuoriyarvi, NW Russia): Mineralogy and Geochemistry

Evolution of pyrochlore in carbonatites of the Amba Dongar complex, India.

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