A Significant Find of a Low Grade Copper Resource of Nanagwas Block, Nimkathana Copper Belt, Rajasthan: A Promising Future Resource

Mondal, Bulbul; Debnath, Sanjoy; Dewangan, Supriya

doi:10.1007/s12594-019-1117-9

Cited by 3 publications

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“…2. A reproduced geological map (after Mondal et al . 2019) showing the spatial association of the mineralized sulfide zones and the scapolite-bearing bands and sampling points in parts of the Nim ka Thana belt (study area), western India. …”

Section: Geology Of the Study Areamentioning

confidence: 99%

Evidence of ore-bearing fluid interaction with Proterozoic metasediments for the genesis of scapolite in parts of the North Delhi Fold Belt, western India

Sharma

Sahoo²,

Babu³

2022

Geol. Mag.

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Scapolite occurrences are widely observed in the metasedimentary rocks exposed around the Khetri Copper Belt and adjoining Nim ka Thana copper mineralized area in western India. Amoeboidal to well-developed and rounded/elliptical-shaped marialitic scapolite (Na-rich end-member) rich zones with variable Cl contents ranging from 1.0 wt % to 2.9 wt % have been identified in proximity to the ore-bearing hydrothermal fluid activity zones. Although scapolite is formed as a product of regional metamorphism in many places, in this study, we propose a strong possibility that scapolite was formed by hydrothermal ore-bearing fluid interaction with metasediments. The evidence of hydrothermal activity and Cl sourcing is attributed to (i) the absence of evaporite beds in the area and no Na-rich plagioclase as inclusions within the scapolite suggesting the formation of marialitic scapolite from sodic plagioclase in the metasediments with the interacting hydrothermal fluid; (ii) an epithermal to mesothermal hydrothermal fluid with moderate salinity responsible for the Cu mineralization that is ascribed to be the source of Cl for the formation of marialitic scapolite; (iii) diffusion of SO2 in the scapolite in close association with the sulfide mineral phase (chalcopyrite) supporting the involvement of ore-bearing fluid in the development of scapolite; (iv) the absence of zoned scapolite, the spatial distribution of scapolite in a particular lithology, the occasional incorporation of sulfur into marialitic scapolite and the texture/geometry in the scapolite suggesting a broad hydrothermal linkage instead of a pure metamorphic origin.

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Section: Geology Of the Study Areamentioning

confidence: 99%

Evidence of ore-bearing fluid interaction with Proterozoic metasediments for the genesis of scapolite in parts of the North Delhi Fold Belt, western India

Sharma

Sahoo²,

Babu³

2022

Geol. Mag.

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“…[61]. The points with high bismuth values show anomalous values of tin also.The EPMA study of sulphides from Dariba north which forms part of the Central sector located within the main antiform structure; the Dariba antiform indicates that sulphides are present in the form of fine to very fine disseminations.…”

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confidence: 93%

Geology of the Copper Mineralization in Proterozoic Ajabgarh Meta-Sediments of, Dokan-Dariba Belt, Sikar District Rajasthan Northwestern India

Sharma¹

2023

OJG

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The Khetri copper belt is a well-known metallotect in northern part of Delhi fold belt in Rajasthan. On the eastern margin of the Khetri sub basin of North Delhi basin separated by a basement high, another sub basin Alwar-Ajabgarh sub basin exposes that a thick sequence of Ajabgarh group of rocks overlies a thick arenaceous sequence of Alwar group of Delhi Super Group of rocks. The Ajabgarh meta sediments here in the Neem Ka thana area are characterized by presence of Bornite dominated copper mineralization with silver association and minor presence of Pb. The mineralization has been described by various workers as strata-bound, hypogene and IOCG. But these inferences are based on part information and the inference drawn is sectorial in nature. The current study includes a holistic study based on exploration over a period of more than two decades and the data generated suggest thereof, that this syngenetic sulphide mineralization associated with the sedimentation of marl and carbonate rocks. Subsequently it has been relocated during 2 nd deformation accompanied by epigenetic component of mineralization depicted in terms of vein filled coarse grained aggregates of bornite and chalcopyrite disposed across the general disposition of litho-package. The EPMA and fluid inclusion data generated from the area indicate association of typical hydrothermal environment minerals like, Perkrite, Wittchenite, Aguilarite, Molybdnite etc. The mineralizing fluids have been trapped between the temperature ranges of 130˚C to 375˚C with average being 250˚C to 300˚C. The fluid salinity also varies from near pure hot water to moderately saline fluid indicative of multi-episodic mineralization of syngenetic nature coupled with epigenetic component. The ore textures indicate 500˚C temperature range; certain intergrowths of minerals like specular hematite and bornite suggest How to cite this paper: Sharma, R.K. (2023) Geology of the Copper Mineralization in Proterozoic Ajabgarh Meta-Sediments of, Dokan-

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Fluid evolution, metal source, and ore genesis of sulfide mineralization, Nim Ka Thana Copper Belt, Rajasthan, India: evidence from mineral chemistry, fluid inclusions and sulfur isotope geochemistry

Gantait

Debnath²,

Anand³

et al. 2023

Arab J Geosci

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A Significant Find of a Low Grade Copper Resource of Nanagwas Block, Nimkathana Copper Belt, Rajasthan: A Promising Future Resource

Cited by 3 publications

References 0 publications

Evidence of ore-bearing fluid interaction with Proterozoic metasediments for the genesis of scapolite in parts of the North Delhi Fold Belt, western India

Evidence of ore-bearing fluid interaction with Proterozoic metasediments for the genesis of scapolite in parts of the North Delhi Fold Belt, western India

Geology of the Copper Mineralization in Proterozoic Ajabgarh Meta-Sediments of, Dokan-Dariba Belt, Sikar District Rajasthan Northwestern India

Fluid evolution, metal source, and ore genesis of sulfide mineralization, Nim Ka Thana Copper Belt, Rajasthan, India: evidence from mineral chemistry, fluid inclusions and sulfur isotope geochemistry

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