Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

Ananda Deb Mukherjee ¹

Affiliations
1 Department of Geological Sciences, Jadavpur University, Calcutta, IN

Abstract

No Abstract.

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Ananda Deb Mukherjee ¹, R. Sen ²

Affiliations
1 Department of Geological Sciences, Jadavpur University, Calcutta, IN
2 Hindusthan Zinc Ltd., Udaipur, Rajasthan, IN

Abstract

Ball textures in the sulphide ores of Khetri copper belt, Rajasthan are considered to be the result of extreme deformation. The ore in the cases described are considered premetamorphic.

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Ananda Deb Mukherjee ¹, Ranen Sen ²

Affiliations
1 Department of Geological Sciences, Jadavpur University, Calcutta 700 032, IN
2 Regional Development Group, Indian Institute of Management, Calcutta, IN

Abstract

Existence of an intermediate alteration product of pyrrhotite is confirmed in the sulphide ores of Kvikne, Norway and Kolihan, India. The alteration takes place due to change in oxygen potential by the introduction of atmospheric oxygen to pyrrhotite surface. Electron microprobe analysis of this intermediate product showed 44.2-45.1% (Fe) and 52.7-53% (S). Presence of no other element was detected.

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V. N. Vasudev ¹, Ananda Deb Mukherjee ²

Affiliations
1 Department of Mines and Geology, Bangalore 560 001, IN
2 Department of Geological Sciences, Jadhavpur University, Calcutta, IN

Abstract

Stratiform pyrrhotitic sulphide ores occur at Ganacharpura which forms a part of mafic volcanic and volcano-sedimentary terrain of the Archaean Kolar greenstone belt. The ores are interbanded with graphite-quartz-sericite schist and are metamorphosed and deformed along with the associated rock types of the area. Dominant ore mineral is pyrrhotite while chalcopyrite, pyrite, sphalerite, galena, magnetite and mackinawite are present in subordinate amounts. The mineral chemistry of the co-existing sulphide phases indicate equilibration at 587°C and 4.98 Kbar total pressure. The fugacities of sulphur and oxygen, reflected in various sulphide assemblages varied considerably, but the fluid composition during metamorphism was essentially internally controlled instead of being externally imposed. The co-existing pyrrhotite, pyrite and magnetite indicate log f_s2= -2.4 and log f_o2= -17.8 during culmination of metamorphism. It is suggested that the ores are of volcano-sedimentary type and are later modified by mobilisation/remobilisation during diastrophism. The arc-forming metals and sulphur have probably been derived from volcanic exhalations.

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Ananda Deb Mukherjee ¹, Partha Pratim Sen ¹

Affiliations
1 Department of Geological Sciences, Jadavpur University, Calcutta 700 032, IN

Abstract

The occurrence and optical properties of mackinawites of different chemical, compositions from the Chandmari mine are described. The fact that mackinawites are clearly capable of accommodating a wide range of cations in their structures has been explained.

Keywords

Copper, Chandmari, Mackinawite, Khetri Copper Belt, Rajasthan.

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H. N. Bhattacharyya ¹, Tapan Kumar Ghosh ¹, Ananda Deb Mukherjee ¹

Affiliations
1 Department of Geological Sciences, Jadavpur University, Calcutta 700 032, IN

Abstract

No Abstract.

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Ananda Deb Mukherjee ¹, R. Sen ², Arpita Mondal ¹

Affiliations
1 Department of Geological Sciences, Jadavpur University, Calcutta - 700 032, IN
2 Centre for Geological Studies, 44/17, B.T. Road, Calcutta -700 050, IN

Abstract

The polymetallic sulphide are deposits of Delhi-Aravalli orogenic belt exhibit occurrerce of freibergite (a mineral of fahlore group) as a major source for recovery of silver as an important byproduct. EPMA data on the chemistry offreibergite is presented. In order to obtain optimal recovery of Ag from the ores of these deposits, selective flotation of freibergite is suggested.

Keywords

Economic Geology, Ore Mineralogy, Freibergite, Delhi-Aravalli Belt, Rajasthan.

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