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

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Zoned Sedimentary Magnetites from Precambrian Banded Iron Formation of Eastern India


Affiliations
1 Department of Applied Geology, Indian School of Mines, Dhanbad 826 004, India
2 Department of Geological Sciences, Jadavpur University, Calcutta 700 032, India
 

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Electron microprobe study of low temperature zoned magnetite grains of primary sedimentary origin from the Precambrian banded iron formation (BIF) of Eastern India revealed alternate micro-bands rich in silica and iron, while minor concentration of magnesium is also found in silica-rich bands. X-ray data indicate a normal type of magnetite structure and trace element values support its primary sedimentary origin. Origin of the zoning in magnetite is attributed to enrichment of Si and Fe in alternate bands on a microscale simulating the alternate silica and iron rich bands of the host-rock-banded iron formation.
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  • Zoned Sedimentary Magnetites from Precambrian Banded Iron Formation of Eastern India

Abstract Views: 241  |  PDF Views: 142

Authors

Tapan Majumder
Department of Applied Geology, Indian School of Mines, Dhanbad 826 004, India
K. L. Chakraborty
Department of Geological Sciences, Jadavpur University, Calcutta 700 032, India

Abstract


Electron microprobe study of low temperature zoned magnetite grains of primary sedimentary origin from the Precambrian banded iron formation (BIF) of Eastern India revealed alternate micro-bands rich in silica and iron, while minor concentration of magnesium is also found in silica-rich bands. X-ray data indicate a normal type of magnetite structure and trace element values support its primary sedimentary origin. Origin of the zoning in magnetite is attributed to enrichment of Si and Fe in alternate bands on a microscale simulating the alternate silica and iron rich bands of the host-rock-banded iron formation.