Geological Constraints on the Genesis of Jagpura Au-Cu Deposit NW India: Implications from Magnetite-Apatite Mineral Chemistry, Fluid Inclusion and Sulfur Isotope Study
The Jagpura Au-Cu deposit is situated within the Aravalli craton in the northwestern part of India. In the present work, petrography, mineral chemistry, fluid inclusion and sulfur isotopic compositions were used to study the Jagpura Au-Cu deposit. The ore mineral association of the deposit is arseno...
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MDPI AG
2022-10-01
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| author | Abhishek Anand Sahendra Singh Arindam Gantait Amit Srivastava Girish Kumar Mayachar Manoj Kumar |
| author_facet | Abhishek Anand Sahendra Singh Arindam Gantait Amit Srivastava Girish Kumar Mayachar Manoj Kumar |
| author_sort | Abhishek Anand |
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| description | The Jagpura Au-Cu deposit is situated within the Aravalli craton in the northwestern part of India. In the present work, petrography, mineral chemistry, fluid inclusion and sulfur isotopic compositions were used to study the Jagpura Au-Cu deposit. The ore mineral association of the deposit is arsenopyrite, loellingite, chalcopyrite, pyrrhotite and pyrite, along with native gold, magnetite and apatite. The gold fineness ranges from 914–937‰ (avg. 927‰). The presence of Au-Bi-Te phases, pyrite (>1 Co/Ni ratio), magnetite (≥1 Ni/Cr ratio, <1 Co/Ni ratio) and apatite (>1 F/Cl ratio) suggest the hydrothermal origin Au-Cu mineralization. A fluid inclusion study indicates the different episodes of fluid immiscibility with the homogenization temperatures varying between 120–258 °C and salinities range within the 8.86–28.15 wt% NaCl eq. The sulfur isotopic composition of sulfides varies from 8.98 to 14.58‰ (avg. 11.16‰). It is inferred that the variation in the sulfur isotopic compositions of sulfides is due to the cooling and dilution of the metalliferous fluid of mixed origin, derived from the basement meta-sedimentary rocks and the high saline basinal fluid. The iron oxide-copper-gold-apatite associations, structural control of mineralization, pervasive hydrothermal alteration, fluid salinity and sulfur isotope compositions indicate that the Jagpura Au-Cu deposit is similar to the iron oxide-copper-gold (IOCG)-iron oxide-apatite (IOA)types of deposits. Based on the ore geochemistry and the trace elements systematic of magnetite, the deposit is further classified as an IOCG-IOA type: IOCG-Co (reduced) subtype. |
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| spelling | doaj.art-3e3e93df913d4dafb82bf92129aad3d02023-11-24T05:57:55ZengMDPI AGMinerals2075-163X2022-10-011211134510.3390/min12111345Geological Constraints on the Genesis of Jagpura Au-Cu Deposit NW India: Implications from Magnetite-Apatite Mineral Chemistry, Fluid Inclusion and Sulfur Isotope StudyAbhishek Anand0Sahendra Singh1Arindam Gantait2Amit Srivastava3Girish Kumar Mayachar4Manoj Kumar5State Unit Rajasthan, Geological Survey of India, Western Region, Jaipur 302004, IndiaDepartment of Applied Geology, Indian Institute of Technology (ISM), Dhanbad 826004, IndiaState Unit Rajasthan, Geological Survey of India, Western Region, Jaipur 302004, IndiaState Unit Rajasthan, Geological Survey of India, Western Region, Jaipur 302004, IndiaGeological Survey of India, NCEGR, Bengaluru 560078, IndiaState Unit Madhya Pradesh, Geological Survey of India, Central Region, Bhopal 462016, IndiaThe Jagpura Au-Cu deposit is situated within the Aravalli craton in the northwestern part of India. In the present work, petrography, mineral chemistry, fluid inclusion and sulfur isotopic compositions were used to study the Jagpura Au-Cu deposit. The ore mineral association of the deposit is arsenopyrite, loellingite, chalcopyrite, pyrrhotite and pyrite, along with native gold, magnetite and apatite. The gold fineness ranges from 914–937‰ (avg. 927‰). The presence of Au-Bi-Te phases, pyrite (>1 Co/Ni ratio), magnetite (≥1 Ni/Cr ratio, <1 Co/Ni ratio) and apatite (>1 F/Cl ratio) suggest the hydrothermal origin Au-Cu mineralization. A fluid inclusion study indicates the different episodes of fluid immiscibility with the homogenization temperatures varying between 120–258 °C and salinities range within the 8.86–28.15 wt% NaCl eq. The sulfur isotopic composition of sulfides varies from 8.98 to 14.58‰ (avg. 11.16‰). It is inferred that the variation in the sulfur isotopic compositions of sulfides is due to the cooling and dilution of the metalliferous fluid of mixed origin, derived from the basement meta-sedimentary rocks and the high saline basinal fluid. The iron oxide-copper-gold-apatite associations, structural control of mineralization, pervasive hydrothermal alteration, fluid salinity and sulfur isotope compositions indicate that the Jagpura Au-Cu deposit is similar to the iron oxide-copper-gold (IOCG)-iron oxide-apatite (IOA)types of deposits. Based on the ore geochemistry and the trace elements systematic of magnetite, the deposit is further classified as an IOCG-IOA type: IOCG-Co (reduced) subtype.https://www.mdpi.com/2075-163X/12/11/1345Jagpura Au-Cu depositAravalli Cratonhigh fineness goldhydrothermal magnetitefluid inclusionssulfur isotopic composition |
| spellingShingle | Abhishek Anand Sahendra Singh Arindam Gantait Amit Srivastava Girish Kumar Mayachar Manoj Kumar Geological Constraints on the Genesis of Jagpura Au-Cu Deposit NW India: Implications from Magnetite-Apatite Mineral Chemistry, Fluid Inclusion and Sulfur Isotope Study Minerals Jagpura Au-Cu deposit Aravalli Craton high fineness gold hydrothermal magnetite fluid inclusions sulfur isotopic composition |
| title | Geological Constraints on the Genesis of Jagpura Au-Cu Deposit NW India: Implications from Magnetite-Apatite Mineral Chemistry, Fluid Inclusion and Sulfur Isotope Study |
| title_full | Geological Constraints on the Genesis of Jagpura Au-Cu Deposit NW India: Implications from Magnetite-Apatite Mineral Chemistry, Fluid Inclusion and Sulfur Isotope Study |
| title_fullStr | Geological Constraints on the Genesis of Jagpura Au-Cu Deposit NW India: Implications from Magnetite-Apatite Mineral Chemistry, Fluid Inclusion and Sulfur Isotope Study |
| title_full_unstemmed | Geological Constraints on the Genesis of Jagpura Au-Cu Deposit NW India: Implications from Magnetite-Apatite Mineral Chemistry, Fluid Inclusion and Sulfur Isotope Study |
| title_short | Geological Constraints on the Genesis of Jagpura Au-Cu Deposit NW India: Implications from Magnetite-Apatite Mineral Chemistry, Fluid Inclusion and Sulfur Isotope Study |
| title_sort | geological constraints on the genesis of jagpura au cu deposit nw india implications from magnetite apatite mineral chemistry fluid inclusion and sulfur isotope study |
| topic | Jagpura Au-Cu deposit Aravalli Craton high fineness gold hydrothermal magnetite fluid inclusions sulfur isotopic composition |
| url | https://www.mdpi.com/2075-163X/12/11/1345 |
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