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Banded Iron Formation, or BIF, is the name given to these banded and kink-folded alternating layers of iron oxide (hematite and magnetite) and microcrystalline silica (red …
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Banded-iron-formation-(BIF) hosted iron deposits, particularly the high-grade (> 60% Fe) version of those, are the most important Fe metal system worldwide as far as production, reserves and employment of geologists are concerned.This is reflected in the significant amount of scientific papers published and conferences and short courses …
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A nearly 3-billion-year-old banded iron formation from Canada shows that the atmosphere and ocean once had no oxygen. Photosynthetic organisms were making oxygen, but it …
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Banded iron formations are unique iron-and silica-rich marine chemical sedimentary rocks deposited in mostly Archean and Paleoproterozoic strata in an anoxic marine en-vironment. The term of BIFs originated from the description of iron formation in Lake Superior district [1]. BIFs are defined as chemical sedimentary rocks consisting of …
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The banded iron formation is a geological unit composed of iron-rich rock. These formations have a banded pattern that is created when alternating layers of oxidized and reduced iron minerals are deposited. …
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The high content of ferrous iron in the lakes absorbed toxic oxygen forming iron oxides as banded iron formation (BIF). Excess photosynthetic oxygen molecules escaped into the anoxic atmosphere. At ~ 1.8Ga oxygenated meteoric water infiltrated the continental subsurface oxidizing hydrothermal fluids, precipitating …
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A nearly 3-billion-year-old banded iron formation from Canada shows that the atmosphere and ocean once had no oxygen. Photosynthetic organisms were making oxygen, but it reacted with the iron dissolved in seawater to form iron oxide minerals on the ocean floor, creating banded iron formations. The dark layers in this boulder are mainly composed ...
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Iron formations (IFs) are marine chemical precipitates that contain >15 wt.% Fe (James 1954) that were deposited in the Precambrian .Gross classified IFs into four types, two of which continue in use today: Algoma, which are relatively small in total volume and are associated with significant volcanic input including volcanogenic massive sulfide …
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brown = granular iron formation, red = Snowball Earth formations (KG Budge 2020, public domain) What are Banded Iron Formations (BIFs)? Banded iron formations …
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Banded iron formation is a chemogenic sedimentary rock (material is believed to be chemically precipitated on the seafloor). Because of old age BIFs generally have been metamorphosed to a various degrees (especially older types), but the rock has largely retained its original appearance because its constituent minerals are fairly stable at ...
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Banded iron formations (BIF) represent the largest source of iron in the world. They formed throughout the Precambrian, and today are globally distributed on the remnants of the ancient cratons. The first BIF dates …
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DR.19296. Banded Iron Formation, or BIF, is the name given to these banded and kink-folded alternating layers of iron oxide (hematite and magnetite) and microcrystalline silica (red and brown chert and golden-brown tiger eye). They used to be iron-rich and silica-rich sediments on the ancient sea floor about 2.5 billion years ago.
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1. Introduction. Banded iron formations (BIFs) are one of the most important lithologies in Precambrian sedimentary successions. The abundance of BIF is mostly restricted between the Eoarchean and the Paleoproterozoic excepting a few examples from the Meso- and Neoproterozoic (Goodwin, 1973; Holland, 1973; Huston and Logan, …
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Dobson, D. P. & Brodholt, J. P. Subducted banded iron formations as a source of ultralow-velocity zones at the core–mantle boundary. Nature 434, 371–374 (2005). Google Scholar
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The deposition of banded iron formations (BIF) is completely independent of atmospheric oxygen (Lascelles, 2013) and furthermore the Boolgeeda Iron Formation was exposed to Palaeoproterozoic ...
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Abstract. Banded iron formations (BIF) are the protolith to most of the world's largest iron ore deposits. Previous hypogene genetic models for Paleoproterozoic "Lake Superior" …
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The Atmosphere and Hydrosphere. Kent C. Condie, in Earth as an Evolving Planetary System (Third Edition), 2016 Banded Iron Formation. Banded iron formation or BIF is a chemical sediment, typically thin-bedded or laminated with > 15% iron of sedimentary origin (Figure 8.6).BIF has a very distinct distribution with time (Figure 8.25).It is found in minor …
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The Dales Gorge Member is the lowermost unit of the Brockman Iron Formation in the Hamersley Supergroup (Fig. 1).On the basis of SHRIMP U–Pb ages from zircons extracted from tuffaceous bands, Trendall et al. (2004) proposed a depositional age between 2494 and 2464 Ma for the member. As originally defined by Trendall and …
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In spite of this effort, the mechanism of their deposition and, specifically, the role that microbes played in the precipitation of banded iron formation minerals, remains unresolved. Evidence of an anoxic …
DetailsCurrent models for the origin of banded iron-formation (BIF) derived in situ iron ore deposits assume that the typical chert and iron oxide banded BIF is the primary rock from which enriched iron ...
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Banded iron formations (BIFs) comprise the largest iron resource on Earth. They formed throughout much of the Precambrian ( 3,800–543 Ma), reaching their maximum …
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Banded iron formations (BIFs) are chemical sediments that reflect the composition of the seawater from which they were deposited. Therefore, they provide a key part of the evidence for the modern scientific understanding of paleoenvironmental conditions in Archean and Paleoproterozoic times. Although BIFs have been extensively …
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Banded iron formation also shortly known as BIF is a major source of iron. BIF is a rock type made up of substituting silica- and iron-rich bands. BIF is economically among the most significant rock types as our society is largely dependent on iron, which is principally extracted from this rock. Photosynthetic organisms that were producing ...
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This review paper examines banded iron formation-hosted higher-grade (.58 wt% Fe) iron ore types present in the two main metallogenic districts of Western Australia, the Yilgarn Craton and the ...
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Banded Iron Formations (BIFs) are distinctive units of sedimentary rocks composed of alternating layers of iron-rich minerals, mainly hematite and magnetite, and silica-rich minerals like chert or quartz. The name "banded" comes from the alternating bands of different compositions, creating a layered appearance. BIFs often also contain …
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The main host rocks to iron ore in the Pilbara Craton are the thicker and generally more iron-rich BIF units of the 3022-3016 Ma Cleaverville Formation, with only minor iron ore hosted by older BIF units of the Kangaroo Caves and Paddy Market Formations. Furthermore, the Cleaverville Formation is thicker and more laterally
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The chemical signatures and mineralogy of banded iron formations have the potential to provide information about the ocean environment on early Earth 1,2,3,4,5,6,7.Their formation requires iron ...
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What are Banded Iron Formations (BIFs)? • Large sedimentary structures • Bands of iron rich and iron poor rock • Archaean and Proterozoic in age BIF formation through time …
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Banded iron formations (BIFs) are iron- and silica-rich sedimentary rocks, the genesis of which is thought to require low oceanic O 2 concentrations, in agreement with their occurrence before ...
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Banded iron formations (BIF) comprise the largest iron resource on Earth. They formed throughout much of the Precambrian (∼3,800–545 Ma), reaching their maximum …
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A lithological term applied to a thinly bedded or. laminated chemical sedimentary rock consisting. of successive layers of fine-grained quartz, iron. oxides, carbonates, and/or silicates ...
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Banded iron formations (BIFs) represent purely sedimentary geological environment, show macrobandings (1 m–100 m), mesobandings (1 mm–10 cm), microbandings (0.2 mm–1 mm) and crypto-nanobandings (26 nm–0.2 mm) of hypogene oxide facies (magnetite, hematite), silicate facies (Fe-Mg-Mn silicates, commonly chert, …
Details1. Introduction. The geochemistry of banded iron formation in a large greenstone belt, such as the Abitibi, may contain information about the water mass from which the sediment formed, atmospheric conditions that prevailed during weathering and transport of dissolved species from land to sea (e.g., U, Th, the rare earth elements …
DetailsBanded iron formations (BIFs) are iron-rich (~30 wt%) and distinctively layered chemical sediments that were widely deposited in the Neoarchean to early Paleoproterozoic oceans, between 2.8 and 2. ...
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5) (Fig. 1).OverviewBanded iron formations (BIFs) comprise the largest i. on resource on Earth. They formed throughout much of the Precambrian ( 3,800543 Ma), reaching their maximum abund. between 2,700. and–2,400 Ma ago. …
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The Biology Behind Banded Iron Formations. A long-enduring puzzle in the evolution of the early Earth concerns when and to what extent surface oxidation occurred. One important piece of this puzzle is determining when oxygen production began, and how early oxygen was consumed by reduced species, such as iron (Fe (II)), in the oceans.
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Periodic precipitation of iron oxide and silica was induced through a self-organization mechanism. P ptn : mineral precipitation; S 1, D 1 : the area of the upper surface of the mixing zone and ...
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Large deposits of iron formation are present in all major Pre cambrian cratons of the earth, and probably 90% or more of all iron formation that has been preserved is contained in the five great districts placed in the "Very large" class in Table 1: the Labrador Trough and its extensions in Canada; the Hamersley
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Banded iron formations (BIFs) comprise the largest iron resource on Earth. They formed throughout much of the Precambrian (∼3800–543 Ma), reaching their maximum …
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