Multiple episodes of hydrothermal alteration and uranium mineralization in the Singhbhum Shear Zone, eastern India: constraints from chemical and boron isotope composition of tourmaline

Patel, Sarita; Upadhyay, Dewashish; Mishra, Biswajit; Abhinay, Kumar; Sarangi, A. K.

doi:10.1016/j.lithos.2021.106084

Cited by 6 publications

(6 citation statements)

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“…The results show that the fluid from which the Mohuldih fluorapatite precipitated was rich in F (286–319 ppm, median = 306 ppm) but low in Cl (4–109 ppm, median = 48 ppm) concentrations (Table S2). At Mohuldih, the metals were transported as Cl‐complexes by a saline‐oxidizing fluid, and then precipitated with decreasing salinity (Patel et al, 2021). As a result, the fluid became relatively enriched in F.…”

Section: Discussionmentioning

confidence: 99%

“…High salinity externally‐derived fluids promoted Cl‐complexation, which helped to transport U, REE, Fe and other elements. With continued fluid–rock interaction and phyllosilicate dissolution, the salinity of the fluids decreased, which inhibited Cl‐complexation and led to the precipitation of minerals like uraninite, monazite, allanite and magnetite (Patel et al, 2021). The second stage of low‐temperature hydrothermal alteration remobilized the LREE from the primary phases and precipitated LREE‐bearing minerals such as monazite and allanite along the grain boundaries and cracks of fluorapatite and magnetite, respectively.…”

Section: Discussionmentioning

confidence: 99%

“…Kusebauch et al (2015) S2). At Mohuldih, the metals were transported as Cl-complexes by a saline-oxidizing fluid, and then precipitated with decreasing salinity (Patel et al, 2021). As a result, the fluid became relatively enriched in F.…”

Section: Nature Of the Mineralizing Fluidsmentioning

confidence: 99%

“…0.9 Ga (Pal et al, 2009, 2010, 2011, 2021; Pal & Rhede, 2013). The chemical and boron isotope composition of hydrothermal tourmaline from the U deposits along the shear zone suggests the involvement of a saline, oxidizing and acidic slab and/or marine evaporate‐derived (Pal et al, 2010; Patel et al, 2021) mineralizing fluid. Patel et al (2021) argued that U was transported as chloride complexes and its precipitation was linked to the destabilization of these complexes in response to increased pH due to fluid–rock interaction.…”

Section: Introductionmentioning

confidence: 99%

“…deposit is one such occurrence that is currently the world's largest producer of U. Recent studies suggest that U mineralizing fluids in IOCG systems are saline and oxidized and, therefore, capable of leaching and transporting significant amounts of the metal (Hitzman & Valenta, 2005;Pal et al, 2010;Patel et al, 2021). Although the IOCG-type deposits are typically hosted in various rock types, many are known to be spatially and temporally associated with batholithic complexes of intermediate to felsic composition.…”

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confidence: 99%

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Magnetite‐fluorapatite geochemistry and monazite U–Pb geochronology of the Mohuldih uranium deposit, Singhbhum Shear Zone, eastern India

et al. 2023

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In this study, textural relations coupled with mineral chemistry of hydrothermal magnetite, fluorapatite, monazite and allanite from the Mohuldih uranium deposit in the Singhbhum Shear Zone (SSZ) is used to characterize the nature of the fluid during various events of alteration and uranium precipitation. These minerals have two distinct textural types, the earlier of which are coeval with the uraninite mineralization. The later type formed during subsequent hydrothermal overprint as a result of coupled dissolution‐reprecipitation of earlier fluorapatite and mobilization of light rare earth elements. Uranium‐lead dating of texturally‐constrained hydrothermal monazite grains yields two major concordant age clusters at 1855 ± 7 Ma and 963 ± 10 Ma and several discordant analyses. Two spot analyses furnish concordant ages of 1656 ± 33 Ma and 1438 ± 35 Ma that are identical within error of the 207Pb/206Pb ages (1628–1643 Ma and ca. 1392 Ma) of several discordant data points. Similar ages have been reported by other studies from the rocks of the SSZ and are therefore considered to be geologically meaningful. The oldest age of ca. 1855 Ma obtained from the texturally early core regions of monazite corresponds to the earliest stage of uraninite mineralization. The two main alteration types can be interpreted based on the known metamorphic events in the SSZ. A combination of high‐temperature calcic iron ± sodic and high‐temperature potassic iron alteration accompanied the M1 metamorphic event and the low‐temperature silicification/K‐Al alteration during the M2 metamorphic event. A comparative study between our data on magnetite and fluorapatite compositions with those from global iron oxide‐Cu‐gold (IOCG) and iron oxide‐apatite deposits classifies Mohuldih as an IOCG‐type deposit.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%