banded iron formation

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banded iron formation

[¦band·əd ′ī·ərn fȯr‚mā·shən]
(geology)
A sedimentary mineral deposit consisting of alternate silica-rich (chert or quartz) and iron-rich layers formed 2.5-3.5 billion years ago; the major source of iron ore.
References in periodicals archive ?
Inter-bedded schists, amphibolites and banded iron formations with thickness ranging between dozens of metres and 250m constitute the target zone of this deposit.
So the very oldest banded iron formations cannot be the result of O2-dependent oxidation.
The claims are located over an area over 3 kms long of outcropping Precambrian Banded Iron Formations with Iron and potentially precious metal mineralization.
Konhauser's team had previously amassed samples of sedimentary rocks called banded iron formations that span the last three billion years of Earth's history.
VTEM and magnetometer survey covering 1,700 line kilometres delineated numerous targets favourable for gold deposits associated with banded iron formations as well as targets that exhibit high potential for massive sulphide copper, zinc, gold and silver deposits.
The drilling was carried out over an aggregate 1km strike length of targets within a 4km strike length of multiple banded iron formations (BIF) in the northern part of the project area, representing only a very small part of the total 40km BIF strike length within the project tenements.
Banded iron formations and calcium carbonate reef deposits as old as 3.
But the new analyses of ancient rocks known as banded iron formations (SN: 6/20/09, p.
Called banded iron formations or BIFs, these ancient rocks formed between 3.
Sixth, the reappearance of banded iron formations in the late Neoproterozoic has been genetically linked to global glaciation; the assumption is that anoxic seawaters form below a global cover of thick sea ice thereby enabling ferrous iron to remain in solution (Hoffman et al.
The orebody is a flat to gently dipping sheet of hydrothermally altered schist that is closely related to banded iron formations.
the ores are siliceous taconite banded iron formations.