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

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Gold Grains in Fe-Rich Tholeiitic Lava Flows from Amarkantak in the Eastern Deccan Volcanic Province, India


Affiliations
1 Department of Geology, University of Delhi, Delhi- 110 007, India
2 ITMMEC, IIT, Delhi - 110 016, India
 

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Disseminated microscopic gold grains, measuring 8-12 microns across and possessing a fineness of 950 to 960 have been observed in the quartz normative tholeiitic lava flows from the Amarkantak region of the Eastern Deccan Volcanic Province. High temperature of equilibration (1060-1470°C) and very low oxygen fugacity (<5) as determined from the co-existing ulvospinel-magnetite and ilmenite-haematite pairs are proposed to be the controlling factors for the occurrence of gold in these volcanics.
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  • Gold Grains in Fe-Rich Tholeiitic Lava Flows from Amarkantak in the Eastern Deccan Volcanic Province, India

Abstract Views: 221  |  PDF Views: 146

Authors

J. P. Shrivastava
Department of Geology, University of Delhi, Delhi- 110 007, India
S. K. Pattanayak
Department of Geology, University of Delhi, Delhi- 110 007, India
Chatar Singh
ITMMEC, IIT, Delhi - 110 016, India

Abstract


Disseminated microscopic gold grains, measuring 8-12 microns across and possessing a fineness of 950 to 960 have been observed in the quartz normative tholeiitic lava flows from the Amarkantak region of the Eastern Deccan Volcanic Province. High temperature of equilibration (1060-1470°C) and very low oxygen fugacity (<5) as determined from the co-existing ulvospinel-magnetite and ilmenite-haematite pairs are proposed to be the controlling factors for the occurrence of gold in these volcanics.