NDLI: Mineralogy and geochemistry of banded iron formation and iron ores from eastern India with implications on their genesis

Content Provider	Springer Nature Link
Author	Roy, Subrata Venkatesh, A. S.
Copyright Year	2009
Abstract	The geological complexities of banded iron formation (BIF) and associated iron ores of Jilling-Langalata iron ore deposits, Singhbhum-North Orissa Craton, belonging to Iron Ore Group (IOG) eastern India have been studied in detail along with the geochemical evaluation of different iron ores. The geochemical and mineralogical characterization suggests that the massive, hard laminated, soft laminated ore and blue dust had a genetic lineage from BIFs aided with certain input from hydrothermal activity. The PAAS normalized REE pattern of Jilling BIF striking positive Eu anomaly, resembling those of modern hydrothermal solutions from mid-oceanic ridge (MOR). Major part of the iron could have been added to the bottom sea water by hydrothermal solutions derived from hydrothermally active anoxic marine environments. The ubiquitous presence of intercalated tuffaceous shales indicates the volcanic signature in BIF.Mineralogical studies reveal that magnetite was the principal iron oxide mineral, whose depositional history is preserved in BHJ, where it remains in the form of martite and the platy hematite is mainly the product of martite. The different types of iron ores are intricately related with the BHJ. Removal of silica from BIF and successive precipitation of iron by hydrothermal fluids of possible meteoric origin resulted in the formation of martite-goethite ore. The hard laminated ore has been formed in the second phase of supergene processes, where the deep burial upgrades the hydrous iron oxides to hematite. The massive ore is syngenetic in origin with BHJ. Soft laminated ores and biscuity ores were formed where further precipitation of iron was partial or absent.
Starting Page	619
Ending Page	641
Page Count	23
File Format	PDF
ISSN	02534126
Journal	Journal of Earth System Science
Volume Number	118
Issue Number	6
e-ISSN	0973774X
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-12-20
Publisher Institution	Indian Academy of Sciences
Publisher Place	India
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Banded iron formation hematite blue dust mineralogical characterization archean iron ore group India Extraterrestrial Physics, Space Sciences Earth Sciences
Content Type	Text
Resource Type	Article
Subject	1900/1901

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