Not all Neoproterozoic iron formations are glaciogenic: Sturtian-aged non-Rapitan exhalative iron formations from the Arabian–Nubian Shield
Sign Up to like & getrecommendations! Published in 2019 at "Mineralium Deposita"
DOI: 10.1007/s00126-019-00898-0
Abstract: Neoproterozoic iron formations are exposed in the Wadi Hamama area (Egypt) in the northwestern part of the Arabian–Nubian Shield. Mafic and felsic volcanic and volcaniclastic rocks of an intra-oceanic island-arc setting host multiple, thin iron-formation… read more here.
Keywords: iron formations; nubian shield; arabian nubian; neoproterozoic iron ... See more keywords
Geochemical studies of banded iron formations (BIFs) in the North China Craton: a review
Sign Up to like & getrecommendations! Published in 2017 at "Geosciences Journal"
DOI: 10.1007/s12303-017-0042-4
Abstract: Majority of the banded iron formations (BIFs) in China are hosted in North China Craton (NCC). The BIFs in NCC are interlayered with metamorphics including amphibolite, and mainly composed of quartz, magnetite, and hematite with… read more here.
Keywords: iron formations; banded iron; formations bifs; north china ... See more keywords
Widespread occurrences of variably crystalline 13C-depleted graphitic carbon in banded iron formations
Sign Up to like & getrecommendations! Published in 2019 at "Earth and Planetary Science Letters"
DOI: 10.1016/j.epsl.2019.01.054
Abstract: Abstract Almost all evidence for the oldest traces of life on Earth rely on particles of graphitic carbon preserved in rocks of sedimentary protolith. Yet, the source of carbon in such ancient graphite is debated,… read more here.
Keywords: 13c depleted; banded iron; graphitic carbon; iron formations ... See more keywords
Extensive oxidative weathering in the aftermath of a late Neoproterozoic glaciation: Evidence from trace element and chromium isotope records in the Urucum district (Jacadigo Group) and Puga iron formations (Mato Grosso do Sul, Brazil)
Sign Up to like & getrecommendations! Published in 2017 at "Gondwana Research"
DOI: 10.1016/j.gr.2017.05.003
Abstract: Abstract The massive Fe and Mn deposits of the Urucum district (Banda Alta Formation) and the iron formations from Fazenda Sao Manoel (Puga Formation) in Mato Grosso do Sul, Brazil, are associated with glacigenic deposits… read more here.
Keywords: iron formations; late neoproterozoic; district; age ... See more keywords
Seeing through the magnetite: Reassessing Eoarchean atmosphere composition from Isua (Greenland) ≥3.7 Ga banded iron formations
Sign Up to like & getrecommendations! Published in 2017 at "Geoscience frontiers"
DOI: 10.1016/j.gsf.2017.02.008
Abstract: Abstract Estimates of early atmosphere compositions from metamorphosed banded iron formations (BIFs) including the well-studied ≥3.7 BIFs of the Isua supracrustal belt (Greenland) are dependent on knowledge of primary versus secondary Fe-mineralogical assemblages. Using new… read more here.
Keywords: iron formations; eoarchean atmosphere; banded iron; greenland ... See more keywords
Origin of the Urucum iron formations (Neoproterozoic, Brazil): Textural and mineralogical evidence (Mato Grosso do Sul – Brazil)
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DOI: 10.1016/j.oregeorev.2021.104456
Abstract: Abstract Neoproterozoic banded iron formations (BIF) and ironstones occur in the Urucum mining district (Pantanal, Brazil). Microbially mediated formation as microbialites has been proposed for these deposits. This study aims to provide a high resolution… read more here.
Keywords: iron formations; forming systems; evidence; ore forming ... See more keywords
Organic remains in late Palaeoproterozoic granular iron formations and implications for the origin of granules
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DOI: 10.1016/j.precamres.2018.02.016
Abstract: Toward the end of the Palaeoproterozoic era, over 109 billion tonnes of banded (BIF) and granular (GIF) iron formations were deposited on continental platforms. Granules in iron formations are typically sub-spherical structures 0.2 to 10 mm… read more here.
Keywords: iron formations; palaeoproterozoic granular; granular iron; organic remains ... See more keywords
Post‐Great Oxidation Event Orosirian–Statherian iron formations on the São Francisco craton: Geotectonic implications
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DOI: 10.1111/iar.12300
Abstract: The protocratonic core of the São Francisco craton assembled during the 2.1–2.0 Ga Transamazonian orogeny. Orosirian Fe‐rich sequences that extend from the northwestern border of the São Francisco protocraton (Colomi Group) to the southeast under the… read more here.
Keywords: iron; iron formations; great oxidation; oxidation event ... See more keywords
Photoferrotrophy, deposition of banded iron formations, and methane production in Archean oceans
Sign Up to like & getrecommendations! Published in 2019 at "Science Advances"
DOI: 10.1126/sciadv.aav2869
Abstract: Photoferrotrophs repel iron to deposit banded iron formations and contribute methane to the atmosphere during the Archean Eon. Banded iron formation (BIF) deposition was the likely result of oxidation of ferrous iron in seawater by… read more here.
Keywords: iron formations; banded iron; deposition; archean oceans ... See more keywords
Iron Formations as the Source of the West African Magnetic Crustal Anomaly
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DOI: 10.3389/feart.2018.00032
Abstract: The geological sources of major magnetic field anomalies are still poorly constrained, in terms of nature, geometry, and vertical position. A common feature of several anomalies is their spatial correlation with cratonic shields and, for… read more here.
Keywords: iron formations; west african; african magnetic; magnetic field ... See more keywords
Petro-Mineralogical and Geochemical Characterization of the Banded Irons Formations BIFs of the Nimba Range and its Western Extension (Nimba Region)
Sign Up to like & getrecommendations! Published in 2019 at "International Journal of Engineering Research in Africa"
DOI: 10.4028/www.scientific.net/jera.44.99
Abstract: The Nimba Range and its western extension are located in the Nimba region on the borders of the Republic of Guinea, Liberia and Côte d'Ivoire. It is a mountainous region made up of metavolcanic and… read more here.
Keywords: nimba range; nimba region; banded iron; iron formations ... See more keywords