production. Banded iron formations were first discovered in northern Michigan in 1844. Banded iron formations account for more than 60% of global iron reserves...

this time. Banded iron formation largely disappears from the geological record at 1.85 Ga, after peaking at about 2.5 Ga. Banded iron formation can form...

mixture of banded iron formations and granular iron formations. Iron formations can be divided into subdivisions known as: banded iron formations (BIFs) and...

history of the NGB. The banded iron formation can be traced continuously across the northern portion of the belt. The formation is composed mainly of quartz...

quartz). Banded iron formations occur exclusively in Precambrian rocks, and are commonly weakly-to-intensely metamorphosed. Banded iron formations may contain...

typically 2.5 to 2.9 g/cm3. Jaspillite is a banded-iron-formation rock that often has distinctive bands of jasper. The name means "spotted or speckled...

mines and iron ore treatment plants. US iron ore mining is dominated by the Precambrian banded iron formation deposits around Lake Superior, in Minnesota...

The Gunflint chert (1.88 Ga) is a sequence of banded iron formation rocks that are exposed in the Gunflint Range of northern Minnesota and northwestern...

is generally quite iron-rich. Jaspillite is typically a banded mixture of hematite and quartz common in the banded iron formation rocks of Proterozoic...

(/ˈtækənaɪt/) is a variety of banded iron formation, an iron-bearing (over 15% iron) sedimentary rock, in which the iron minerals are interlayered with...

ranges on Earth and primarily consists of ancient rock formations, including banded iron formations (BIFs), that are about 2.5 billion years old. The Pilbara...

for this lies in older rocks that contain massive banded iron formations that were laid down as iron oxides. A terminology has evolved covering the early...

quartz-feldspar-biotite-garnet gneiss, andalusite and sillimanite schists, banded iron formation and other exotics, intruded by minor masses of porphyritic granite...

area wrapping around the western end of Lake Superior. Banded-iron formations are iron formations which formed about 2,000 million years ago and were first...

deposits, are the major lithology. Minor mafic/ultramafic rocks and banded iron formation (BIF) are also found in the sequence. The overall sequence is generally...

structure like magnetite. Large deposits of hematite are found in banded iron formations. Gray hematite is typically found in places that have still, standing...

deposits, which have a different origin, are generally known as banded iron formations. The iron minerals comprising ironstones can consist either of oxides...

chronometrically. The deposition of banded iron formations peaked early in this period. These iron rich formations were formed as anaerobic cyanobacteria...

station code BIF British Industries Fair, Birmingham, England Banded iron formation, a type of rock Bifrenaria, orchid genus Borderline intellectual...

Valentines iron formation is a banded iron formation found in Uruguay. It is composed of itabirite (or valentines) and gneiss. Containing a combination...

ISSN 2328-0328. Cloud, Preston (1973). "Paleoecological Significance of the Banded Iron-Formation". Economic Geology. 68 (7): 1135–1143. Bibcode:1973EcGeo..68.1135C...

thin layers of iron oxides alternating with bands of iron-poor shale and chert. The banded iron formations were laid down in the time between 3,700 million...

of this record of banded ironstone formations and the ferruginous caves which it hosts, the 'Paleoproterozoic Banded Iron Formations of the Quadrilátero...

settings as diverse as hot spring deposits (siliceous sinter), banded iron formation (jaspilite), or alkaline lakes. However, most chert is found either...

of Fe(II). Banded iron formations (BIFs), which have both Fe(II) and Fe(III), were deposited in such environments. The method of formation of Fe(III)...

Marquette, called the Iron Ore Heritage Trail, also provides access to the area's historical sites. Gogebic Range Banded iron formation Taconite Schaetzl...

contributions from this work were: (1) the recognition that the presence of banded iron formations is consistent with such a global glacial episode, and (2) the introduction...

sediments, such as graywackes, mudstones, volcanic sediments, and banded iron formations. Volcanic activity was considerably higher than today, with numerous...

aerobic iron-oxidizing bacterial metabolism is thought to have made a remarkable contribution to the formation of the largest iron deposit (banded iron formation...

where small-scale metasomatism occurs (argillite and limestone, and banded iron formation). The skarn deposits that are considered economically important...