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banded iron formation

banded iron formation

banded iron formation

  • Banded Iron Formation - Lexikon der Geowissenschaften

    Banded Iron Formation, BIF, Banded Iron Stone, gebänderte Eisensteine, eine sedimentäre Wechsellagerung von Eisenoxiden mit Chert (feinstkristallines SiO 2, Kieselschiefer) oder Jasper und teilweise mit Eisencarbonaten und Eisensilicaten wird als Banded Iron Formation im petrologischen und nicht im stratigraphischen Sinne genannt.

  • Bändererz – Wikipedia

    ÜbersichtUrsprungAufbauTypenEntstehungVorkommenLiteratur

    Ein Bändererz ist ein eisenhaltiges, marines Sedimentgestein, das hauptsächlich im Präkambrium abgelagert wurde und das durch metallhaltige Lagen eine charakteristische Schichtstruktur besitzt. Im zur Schichtung senkrechten Schnitt erscheinen die vor allem aus Eisenmineralen bestehenden Schichten als Bänderstruktur, der das Erz im Deutschen wie auch im Englischen (Banded Iron Formation, abgekürzt BIF) seinen Namen verdankt.

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  • Banded-iron formation rock Britannica

    Banded-iron formation (BIF), chemically precipitated sediment, typically thin bedded or laminated, consisting of 15 percent or more iron of sedimentary origin and layers of chert, chalcedony, jasper, or quartz. Such formations occur on all the continents and usually are older than 1.7 billion years. They also are highly metamorphosed.

  • Banded Iron Formation (BIF): How These Rocks Got Their ...

    So over time, the seafloor collected rusted iron. This rusted iron is in the different layers of banded iron formation (BIF) created about 3.7 billion years ago. The alternating layers in banded iron formations represent rock being oxidized.

  • Banded Iron Formation - an overview ScienceDirect Topics

    Banded iron formation (BIF) is both the most easily identifiable of all sedimentary rocks and the one whose origin is most enigmatic. Its flamboyant mesoscale banding is defined by planar variations in the proportions of the two main mineral components – quartz and iron oxides – each of which forms about half of the mass of the rock.

  • Banded Iron Formation - University of Oregon

    Banded Iron formations occur in Proterozoic rocks, ranging in age from 1.8 to 2.5 billion years old. They are composed of alternating layers of iron-rich material (commonly magnetite) and silica (chert). Each layer is relatively thin, varying in thickness from a millimeter or so up to several

  • Solved: 10. (2 Points Total) Describe Banded Iron Formatio ...

    a)Banded iron formation is made of Hematite and jasper or chert (especially silica composition)alternatively.S view the full answer Previous question Next question Get more help from Chegg Get 1:1 help now from expert Earth Sciences tutors

  • Banded Iron Formation Western Australian Museum

    The banded iron formations of the Hamersley Province in the Pilbara region of Western Australia, are the thickest and most extensive rocks of this type in the world. It is estimated that after they were originally deposited, about 2470 to 2450 million years ago, they covered some 150 000 km2 and contained about 300 trillion tonnes of iron.

  • Banded Iron Formation Gold Deposits Offering Exploration ...

    Banded iron formations (BIFs) are found in cratonic greenstone belts, and make up approximately 60 percent of global iron reserves. The name suggests this deposit type is mainly iron, but BIFs are...

  • Solved: 10. (2 Points Total) Describe Banded Iron Formatio ...

    (2 Points Total) Describe Banded Iron Formations (BIFs) :a) What Are They Made Of? (0.5 Point)b) When Did They Form? (0.5 Point)c) What Form Of Iron Reacted With O2 In Seawater To Produce BIFs? (0.5 Point)d) Besides BIFs, What Other Types Of Sedimentary Iron Deposits Are Used As Tracers (proxies) For The Rise Of Atmospheric O2? (0.5 Point) This problem has been solved! See the

  • Banded iron formation - Simple English Wikipedia, the

    Banded iron formations (or BIFs) are a distinctive type of rock often found in (Precambrian) sedimentary rocks. They consist of repeated thin layers of iron oxides, either magnetite (Fe 3 O 4) or hematite (Fe 2 O 3), alternating with bands of iron-poor shale and chert. Some of the oldest known rock formations, formed over 3,700 million years ago (mya), include banded iron layers. The banded ...

  • Banded Iron Formation Western Australian Museum

    Banded iron formations appear to have been deposited in areas of the ocean where seawater with high contents of dissolved iron and silica came into contact with water containing higher amounts of oxygen, which resulted in the precipitation of hematite and chert (microcrystalline quartz). Most of the iron and silicon probably came from upwelling iron-rich, deep ocean currents derived from ocean ...

  • Banded-iron formations (BIFs) - Evidence of Oxygen in ...

    Jaspilite banded iron formation (Soudan Iron-Formation, Soudan, Minnesota, USA. Image Credits: James St. John. In the 1960s, Preston Cloud, a geology professor at the University of California, Santa Barbara, became interested in a particular kind of rock known as a Banded Iron Formation (or BIF). They provide an important source of iron for making automobiles, and provide evidence for the lack ...

  • Banded iron formations Article about Banded iron ...

    Gutzmer, "Deciphering formation processes of banded iron formations from the Transvaal and the Hamersley successions by combined Si and Fe isotope analysis using UV femtosecond laser ablation," Geochimica et Cosmochimica Acta, vol.

  • Banded iron formation - Wikipedia

    Banded iron formations in northern Minnesota were found directly underneath a thick layer of ejecta from the Sudbury Basin impact. At the time of formation Earth had a single supercontinent called Columbia with substantial continental shelves. An asteroid (estimated at 10 km across) slammed into waters about 1,000 m deep some 1.85 billion years ago. Computer models suggest that the tsunami ...

  • Banded Iron Formation "BIF" Geology Page

    Banded iron formations (BIFs) are chemically precipitated sedimentary rocks. They are composed of alternating thin (millimeter to centimeter scale) red, yellow, or cream colored layers of chert or jasper and black to dark gray iron oxides (predominantly magnetite and hematite), and/or iron carbonate (siderite) layers. Banded iron formations have greater than 15% sedimentary iron content ...

  • jsjgeology.net

    Banded iron formations, or BIFs, are unusual, dense sedimentary rocks consisting of alternating layers of iron-rich oxides and iron-rich silicates. Most BIFs are Proterozoic in age (although some are Late Archean), and do not form today - they're "extinct"! Many specific varieties of iron formation are known, and some are given special rock names. For example, jaspilite is an attractive ...

  • Banded Iron Formation Gold Deposits Offering

    Banded iron formation-hosted gold deposits have the potential to become large-tonnage mines with extended mining lives. Due to the appeal of these deposits, gold exploration companies are ...

  • Animikie Group - Wikipedia

    Banded-iron formations occur in several ranges around the margins of this basin, five of which contained sufficient concentrations of iron to be economically mined. These banded-iron formations have been one of the world's greatest sources of iron ore since mining began in the area during the late 19th century. : 7 ...

  • Banded iron formation - WikiMili, The Best Wikipedia

    Banded iron formations account for more than 60% of global iron reserves, and can be found in Australia, Brazil, Canada, India, Russia, South Africa, Ukraine, and the United States. [3] [4] Origins Close-up of banded iron formation specimen from Upper Michigan.

  • Banded-iron formations (BIFs) - Evidence of Oxygen in ...

    Jaspilite banded iron formation (Soudan Iron-Formation, Soudan, Minnesota, USA. Image Credits: James St. John. In the 1960s, Preston Cloud, a geology professor at the University of California, Santa Barbara, became interested in a particular kind of rock known as a Banded Iron Formation (or BIF). They provide an important source of iron for making automobiles, and provide evidence for the lack ...

  • Banded Iron Formation Definition of Banded Iron ...

    Banded iron formation definition is - a sedimentary deposit that consists of alternating thin layers of iron oxides (such as magnetite or hematite) and iron-poor minerals (such as shale or chert) —abbreviation BIF. How to use banded iron formation in a sentence.

  • Gebändertes Eisenerz (BIF - Banded Iron Formation) zum

    BIFs - Banded Iron Formation (gebänderte Eisenerze) Bändereisenerze auch BIFs (Banded Iron Formation) genannt, sind eisenhaltige, im Meer entstandene Sedimentgesteine des frühen Proterozoikums, die eine charakteristische Schichtstruktur besitzten. Dabei wechseln sich eisenhaltige Lagen mit mikrokristallinen Silikatlagen (Jaspis) ab. Die einzelnen Schichten sind einige Millimeter bis

  • Banded iron formation - Infogalactic: the planetary ...

    Banded iron formations (also known as banded ironstone formations or BIFs) are distinctive units of sedimentary rock that are almost always of Precambrian age.. A typical BIF consists of repeated, thin layers (a few millimeters to a few centimeters in thickness) of silver to black iron oxides, either magnetite (Fe 3 O 4) or hematite (Fe 2 O 3), alternating with bands of iron-poor shales and ...

  • Banded iron formation - Sandatlas

    Banded iron formation (BIF) is the principal source of iron. BIF is a rock type composed of alternating silica- and iron-rich bands. Banded iron formation is economically among the most important rock types as our society is heavily reliant on iron, which is mostly extracted from this rock. An Algoma-type BIF sample from Bjørnevatn in northern Norway. Black ore mineral is magnetite. Width of ...

  • Banded iron formation - Wikipedia

    Banded iron formations are almost exclusively Precambrian in age, with most deposits dating to the late Archean (2500-2800 Ma) with a secondary peak of deposition in the Paleoproterozoic (1850 Ma). Minor amounts were deposited in the early Archean and in the Neoproterozoic (750 Ma). The youngest known banded iron formation is an early Cambrian formation in western China.

  • Banded iron formation Types and Facts Monuments

    Depending upon Banded iron formation Texture, it is divided into types. Here, you will get to know about Banded iron formation types, interesting facts, features of Banded iron formation, its monuments and fossils. There are many interesting facts about Banded iron formation

  • How banded iron was formed - YouTube

    30.11.2017  Episode 2 - Banded Iron Formations - Duration: 4:24. Early Earth 10,386 views. 4:24. How Does Iron Spark One of the Most Violent Cosmic Events? - Duration: 3:09. Science Channel 41,383 views. 3:09 ...

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  • Banded Iron Formations BIF - Geology In

    Banded iron formations (also known as banded ironstone formations or BIFs) are distinctive units of sedimentary rock that are almost always of Precambrian age. A typical BIF consists of repeated, thin layers (a few millimeters to a few centimeters in thickness) of silver to black iron oxides, either magnetite (Fe3O4) or hematite (Fe2O3), alternating with bands of iron-poor shales and cherts ...