Mineral Chemistry and In Situ Dating of Allanite, and Geochemistry of Its Host Rocks in the Bagjata Uranium Mine, Singhbhum Shear Zone, India--Implications for the Chemical Evolution of REE Mineralization and Mobilization

Pal, Dipak C.; Chaudhuri, Trisrota; McFarlane, Christopher R.M.; Mukherjee, Anamika; Sarangi, A. K.

doi:10.2113/econgeo.106.7.1155

Cited by 66 publications

(31 citation statements)

References 38 publications

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“…Paleoproterozoic magmatic and hydrothermal events circa 2.0 to 1.8 Ga are also recorded in other studies from the eastern Indian shield (Sarkar et al, 1969;Johnson et al, 1993;Mallik and Sarkar, 1994;Roy et al, 2002). Although this study cannot date the event of HREE metasomatism that altered the earliest uraninite, Pal et al (2011a) in a different study proposed an age of 1.66 Ga for HREE metasomatism, which is in accordance with the age obtained from the relatively homogeneous part of an HREE-rich zone on an HREE-poor uraninite core. The last recognized event of hydrothermal alteration is recorded in the group-2 uraninite.…”

Section: Geochronological Evolution Of Uranium Mineralizationsupporting

confidence: 55%

“…The intercept ages thus obtained are overlapping. The electron probe microanalysis (EPMA) chemical dating and the above discussion clearly indicate that the fi rst event of uranium mineralization at Jaduguda is Paleoproterozoic in age and the hydrothermal event related to this mineralization can be placed at ~1.80 to 1.90 Ga. From an independent study on allanite geochemistry and LA-ICP-MS in situ dating, Pal et al (2011a) recognized an event of hydrothermal fl uid fl ux in the Bagjata uranium deposit of the Singhbhum shear zone at ~1.88 Ga, which is in good accordance with the hydrothermal uranium event recognized in this study. Paleoproterozoic magmatic and hydrothermal events circa 2.0 to 1.8 Ga are also recorded in other studies from the eastern Indian shield (Sarkar et al, 1969;Johnson et al, 1993;Mallik and Sarkar, 1994;Roy et al, 2002).…”

Section: Geochronological Evolution Of Uranium Mineralizationmentioning

confidence: 95%

“…Recent data on grade and tonnage of different metals/ores in individual deposits and the mineral district are not available. For brief information on these aspects, refer to Sarkar (1982Sarkar ( , 1984Sarkar ( , 2000 and Pal et al (2011a). The shear zone has been the site of multiple stages of hydrothermal fl uid fl ux and associated mineralization/mobilization, particularly of U, Cu, and rare earth elements (REEs; Banerji, 1981;Rao and Rao, 1983;Pal et al, 2009Pal et al, , 2010Pal et al, , 2011a.…”

Section: Introductionmentioning

confidence: 99%

“…For brief information on these aspects, refer to Sarkar (1982Sarkar ( , 1984Sarkar ( , 2000 and Pal et al (2011a). The shear zone has been the site of multiple stages of hydrothermal fl uid fl ux and associated mineralization/mobilization, particularly of U, Cu, and rare earth elements (REEs; Banerji, 1981;Rao and Rao, 1983;Pal et al, 2009Pal et al, , 2010Pal et al, , 2011a. Based on in situ laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) U-Pb dating of allanite and monazite, Pal et al (2011a) identifi ed three discrete events of hydrothermal fl uid fl ux at ~1.88, 1.65, and 1.0 Ga in the shear zone.…”

Section: Introductionmentioning

confidence: 99%

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Geochemistry and Chemical Dating of Uraninite in the Jaduguda Uranium Deposit, Singhbhum Shear Zone, India--Implications for Uranium Mineralization and Geochemical Evolution of Uraninite

Pal¹,

Rhede²

2013

Economic Geology

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The Jaduguda uranium deposit in the Singhbhum shear zone is the most important and best-known uranium deposit in India. Uranium mineralization is hosted in hydrothermally altered, metamorphosed, and deformed chlorite and biotite schists. Uraninite is the most abundant and ubiquitous U ore mineral in the shear zone, including the deposit at Jaduguda. The deposit is known to have undergone multiple events of hydrothermal fl uid fl ux. Integrating chemical texture, geochemistry, and in situ electron microprobe U-Th-Pb chemical dating, we aim at deciphering the geochemical and temporal evolution of uranium mineralization in the Jaduguda deposit.Geochemistry of uraninite and X-ray mapping of selected elements demonstrate that, though compositions of small uraninite grains (~10 μm) were mostly or completely modifi ed by subsequent hydrothermal alteration, the larger grains (~100 μm) locally retain the footprints of the earlier events and capture the imprints of subsequent events. In general, all analyzed uraninite grains are poor in Th (<2.5 wt % ThO2) and most grains contain detectable rare earth elements (REEs; ΣREE2O3: ~1.0-~12.5 wt %). Y and heavy rare earth elements (HREEs) are ubiquitous and most important in terms of concentrations. Based on the concentrations of U, Pb, and REEs, the Jaduguda uraninite can be classifi ed into three compositional types: group-1a with low U, high Pb, and low ΣREEs; group-1b with low U and high Pb, but high ΣREEs; and group-2 with high U, low Pb, and moderate ΣREEs. These three compositional types represent three discrete hydrothermal events. Chemical textures of uraninite indicate that the earliest recognized hydrothermal event is manifested in the formation of nearly pure uraninite (group-1a), which is depleted in REEs and other minor elements. The second hydrothermal event is characterized by Y-HREE (+ Ca + Fe) metasomatism that altered the compositions of existing uraninite, shifting its composition toward that of group-1b. The third event further modifi ed the compositions of the previous uraninite, mainly by removing part of the REEs, resulting in uraninite of group-2 composition. Using U-Th-Pb chemical ages (with a mean error of ~25 m.y.) and taking into account the effect of cation exchange on chemical age during alteration, we propose that the uranium mineralization (represented by group-1a uraninite) in the Jaduguda deposit is Paleoproterozoic in age and took place sometime circa 1.80 to 1.90 Ga. The timing of HREE metasomatism is not well constrained. However, published data and this study indicate a ~1.66 Ga age of HREE metasomatism. Based on a strong cluster of ages of group-2 uraninite, we place the latest hydrothermal event, which affected the Singhbhum shear zone in general and the Jaduguda deposit in particular, at ~1.0 Ga.

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Section: Geochronological Evolution Of Uranium Mineralizationsupporting

confidence: 55%

Section: Geochronological Evolution Of Uranium Mineralizationmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geochemistry and Chemical Dating of Uraninite in the Jaduguda Uranium Deposit, Singhbhum Shear Zone, India--Implications for Uranium Mineralization and Geochemical Evolution of Uraninite

Pal¹,

Rhede²

2013

Economic Geology

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“…The ca. 1.06 Ga event marks the latest stage of thermotectonic and hydrothermal activity affecting the Singhbhum shear zone (e.g., Sarkar et al, 1969;Sengupta et al, 1994;Bose, 2009;Acharyya et al, 2010;Pal et al, 2011). (5) Granites from the OMTG and SG Phase II have inherited components of ca.…”

Section: Singhbhum Granite (Sg)mentioning

confidence: 99%

Magmatic and metamorphic history of Paleoarchean tonalite–trondhjemite–granodiorite (TTG) suite from the Singhbhum craton, eastern India

Upadhyay¹,

Chattopadhyay²,

Kooijman³

et al. 2014

Precambrian Research

137

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Detrital zircon U–Pb LA‐ICPMS ages from the Kolhan Group, Singhbhum Craton, eastern India: Implications for terminal Mesoproterozoic palaeogeography between Columbia and Rodinia along the Central Indian Tectonic Zone

et al. 2020

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The Kolhan Group in the Singhbhum Craton of eastern India is a passive margin siliciclastic shelf to deep‐water carbonate ramp platform succession. It occupies a unique position in respect of the Central Indian Tectonic Zone (CITZ), widely considered as the suture joining the northern and southern Indian cratonic blocks at the time of amalgamation of the Mesoproterozoic supercontinent Columbia. The Kolhan succession is closely comparable to other Late Proterozoic ‘Purana’ successions of India including the siliciclastic‐carbonate Suasar Group from the central part of the CITZ. We report here the first U–Pb detrital zircon ages from the Kolhan Group. The youngest age population obtained from basal siliciclastics suggests it is not older than ca. 1,158 Ma. The absence of any concordant detrital zircon <1,000 Ma which is well represented in the adjoining Singhbhum Shear Zone and CITZ extensions, suggests that the sedimentation took place prior to ca. 1,000 Ma. The Kolhan Group, therefore, records an extensional event between two major episodes of supercontinent assembly (i.e., Columbia and Rodinia). A similar motif of extension and passive margin sedimentation across Mesoproterozoic Peninsular India together with the widespread Mesoproterozoic lamproite and kimberlite emplacement event suggests an episode of extension and major basin development across the Indian Shield in between the two supercontinent amalgamation cycles of Columbia and Rodinia.

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Mineral Chemistry and In Situ Dating of Allanite, and Geochemistry of Its Host Rocks in the Bagjata Uranium Mine, Singhbhum Shear Zone, India--Implications for the Chemical Evolution of REE Mineralization and Mobilization

Cited by 66 publications

References 38 publications

Geochemistry and Chemical Dating of Uraninite in the Jaduguda Uranium Deposit, Singhbhum Shear Zone, India--Implications for Uranium Mineralization and Geochemical Evolution of Uraninite

Geochemistry and Chemical Dating of Uraninite in the Jaduguda Uranium Deposit, Singhbhum Shear Zone, India--Implications for Uranium Mineralization and Geochemical Evolution of Uraninite

Magmatic and metamorphic history of Paleoarchean tonalite–trondhjemite–granodiorite (TTG) suite from the Singhbhum craton, eastern India

Detrital zircon U–Pb LA‐ICPMS ages from the Kolhan Group, Singhbhum Craton, eastern India: Implications for terminal Mesoproterozoic palaeogeography between Columbia and Rodinia along the Central Indian Tectonic Zone

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