• A New Fluid Flow Model for the Genesis of Banded Iron

    A fluid and mass flux model is proposed which envisages a three stage process 1 leaching of Fe from banded iron formation BIF in the vadose zone by reduced acidic meteoric derived fluids 2 penetration of an Fe rich supergene fluid plume driven by gravity and focused by bedding parallel permeability into the body of ambient alkaline

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  • Archean cherts in banded iron formation Insight into

    Jun 05 2021  The data were analyzed with a view to better constrain Neoarchean ocean chemistry atmospheric conditions prevalent during weathering and transport the development of Algoma type banded iron formation and the overall process of stratigraphic development of greenstone belts.

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    ALGOMA FE DEPOSITS MODEL 28b Cannon 1986

    Algoma type iron formation is interbedded with submarine mafic to felsic volcanic rocks and volcaniclastic Most ore is banded rock in which iron rich and chert bands are interlayered on a scale of one to a few centimeters gangue minerals in released process water and higher tailings weathering rates.

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  • The Guide to Rocks and Minerals

    Banded Iron formations BIFs are among the oldest rocks on Earth They are marine derived sedimentary deposits i.e they are rock formed from matter which gathered on ancient seabeds and were turned to rock by time and pressure consisting of alternating layers of iron rich rocks mostely magnetite siderite and hematite and silica chert .

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  • Great Oxygenation Event How Oxygen Filled the Atmosphere

    Jan 06 2021  Banded iron formations demonstrate a struggle for constant oxygen Banded iron formations BIF consist of alternating layers of red oxidized and unoxidized black iron Because iron rusts when it reacts with oxygen these layers were red So the red oxidized layers mark a time when there was oxygen.

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  • Archean cherts in banded iron formation Insight into

    The data were analyzed with a view to better constrain Neoarchean ocean chemistry atmospheric conditions prevalent during weathering and transport the development of Algoma type banded iron formation and the overall process of stratigraphic development of greenstone belts.

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  • Iron A biological element

    Jun 25 2015  Banded iron formations are the primary source of iron ore worldwide These rocks at Soudan Underground Mine State Park Minnesota shows banding caused by

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  • EPA recommends against a mine on an important Banded Iron

    January 12 2015 The Environmental Protection Authority has today published its report on a proposal to mine a significant Banded Iron Formation BIF in the northern Goldfields finding it is environmentally unacceptable and recommending it should not be implemented Chairman Dr Paul Vogel said the EPA set the level of assessment on the

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  • Geochemical Constraints on the Origin of Banded Iron

    Mar 30 2018  Banded iron formations BIFs are the most significant source of iron in the world In this study we report petrographic and geochemical data of the BIF from the Meyomessi area in the Ntem Complex southern Cameroon and discuss their genesis and the iron enrichment process.

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  • Assessment of Banded Iron Formations around Gouap Area as

    Geology and geochemistry of Messondo banded iron formation hosted iron ore from the northwestern Congo Craton southern Cameroon implication for iron ore deposits GSJ 2020 8 2 4684 4699.

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  • God King Scenario

    Aug 14 2017  Proposal Like so much of Earth’s sedimentary material banded iron formations are extraterrestrial in origin BIFs 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

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  • Types of Sedimentary Rock

    Oct 09 2019  Banded iron formation of black iron minerals and red brown chert André Karwath / Wikimedia Commons The banded iron formation was laid down more than 2.5 billion years ago during the Archean Eon It consists of black iron minerals and red brown chert During the Archean Earth still had its original atmosphere of nitrogen and carbon dioxide

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  • flow chart of banded iron formation

    Banded iron formations or BIFs are sedimentary rocks consisting of alternating bands iron rich sediment typically hematite Fe2O3 and magnetite Fe3O4 and iron poor sediment typically chert the size of the bands ranges from less than a millimeter to more than a meter in thickness.

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  • A rusty green early ocean

    Jan 31 2017  June 6 2019 A new study shows that banded iron formations originated from oxidized iron confirming the relevance and accuracy of existing models a

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  • Isua Banded Iron From Greenland

    This is an fascinating 4 wide polished slab of Isua Banded Iron from Southwestern Greenland Recently exposed by melting glaciers these rocks from the Isua Greenstone Belt are not only the oldest rocks exposed on earth s surface but studies in 2016 have concluded they also harbor the first evidence of life on earth 3.7 billion years ago Due to the remoteness of the locality the material

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  • Banded Iron Formation

    May 03 2015  Ayres DE 1972 Genesis of iron bearing minerals in banded iron formation mesobands in the Dales Gorge Member Hamersley Group Western Australia Econ Geol 67 1214–1233 CrossRef Google Scholar Bau M 1993 Effects on syn and post depositional processes on the rare earth element distribution in Precambrian iron formations.

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  • Banded iron formation

    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.

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  • Study confirms banded iron formations originated from

    Jun 06 2019  Banded iron formations are a distinct type of sedimentary rock with layers of iron deposited as horizontal bands The majority of these formations formed over

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  • Cock Eyed Bob Gold Mine Randalls Mount Monger Goldfield

    There is abundant visible gold of a nuggetty nature probably making ideal gold mineral specimens but it is likely to all be destroyed in the mining process The high grade gold is found in a banded iron formation host controlled by the intersection of vertical to sub vertical BIF and a series of south plunging quartz ladder vein arrays the

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  • Distinguishing primary versus secondary geochemical and

    Precambrian chert and banded iron formation BIF are defined as chemical sediments precipitated directly from seawater As such their geochemistry including trace elements rare earth elements REE and isotopes O Si may preserve Precambrian seawater conditions However the chemical signature of these rocks may not simply reflect seawater because hydrothermal interactions and

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  • Deformation induced silica redistribution in banded iron

    The formation of banded iron formations BIF remains controversial despite their potential to provide key information on Precambrian atmospheres and hydrospheres It is widely agreed that BIF are chemical sedimentary rocks comprising alternating layers of iron oxides and chert formed from poorly known precursor phases Many models address the chemical transformation of such precursor iron

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  • Learning from the gentry Banded Iron Formations

    Feb 01 2011  Banded Iron formations are a unique rock strata that is formed of alternating bands of iron rich layers interbedded with iron poor silica layers of mostly chert The amorphous silica is typically entrapped by iron oxide laminae to form bands of chert The bands always alternate and have minimal comingling of particles/minerals at the boundaries.

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  • Ward s Banded Iron Formation

    Rock specimens are useful for studying textures grain sizes and other features altered by pressure temperature and other natural forces Different select categories of rock specimens are available for purchase as well including metamorphic igneous and sedimentary rocks Sets of rock specimens are housed in compartmentalized collection boxes with descriptions of each specimen printed

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  • Banded Iron Formation Scientific Info

    ­­­­Genesis Stone Scientific Info Genesis Stone = Magnetite or Hematite Jasper Genesis Stone is from a group of stones scientifically known as Banded iron formations also known as banded ironstone formations or BIFs are distinctive units of sedimentary rock that are almost always of Precambrian age.

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  • Genesis of lateritic iron ore from banded iron formation

    Jun 02 2009  Lateritic weathering of metamorphosed Proterozoic banded iron formation BIF locally named itabirite in Brazil produced large deposits of iron ore At the Capanema iron ore mine in the Quadrilatero Ferrifero in Minas Gerais state southeast Brazil the BIF is a bedded metasedimentary rock composed essentially of layers of hematite/kenomagnetite alternating with layers of quartz.

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  • Banded iron formation

    Description Banded iron formation from the Barberton Greenstone Belt South Africa A typical banded iron formation 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 chert often red in color of similar thickness.

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  • Major Mines Projects

    Banded iron formation Summary The Sino iron project geologically lies near the George Palmer deposit which is situated within the Hamerseley basin Process Plant will be minimal as it will operate as a ‘wet process’ with large volumes of water required throughout the concentrating thickening filtration and dewatering process.

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    Hydrothermal Bacterial Biomineralization Potential Modern

    the inineralogy of these primary precipitates leading to the formation of secondary magnetite and siderite I11 this way all of the main mineralogical components of RIFs can be associated with microbial activity INTRODUCTION hydrothermal source Sinionson 1985 Klein and Beukes 1992 Banded iron formations BIFs are some of the nlost abun

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  • PDF

    Appendix 1 Executive Summary

    dry basis during the assaying process Tonnages are reported as wet million tonnes Mt including approximate moisture content of 4 for MM ore type Sediments include banded iron formation BIF shale dolomite derived from peri platformal ooze chert pyroclastic shale and tuff turbiditic carbonate and turbiditic volcanic rocks.

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  • What are banded iron formations How are they formed

    Banded iron formations are a specific type of sedimentary rock that formed many hundreds of millions of years ago in Earth s geological history Sedimentary means that the rock formations consist

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  • Folded banded iron formation geology

    Folded banded iron formation Close 492 Posted by 10 days ago Folded banded iron formation 1/2 the layers were laid down horizontally in a sedimentary process at the bottom of the sea and the folds came later from tecto forces 19 You might be talking about a Cornwall Type of iron formation which is really a skarn a replacement

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  • Description

    Banded iron formations also known as banded ironstone formations or BIFs are distinctive units of sedimentary rock consisting of alternating layers of iron oxides and iron poor chert.They can be up to several hundred meters in thickness and extend laterally for several hundred kilometers Almost all of these formations are of Precambrian age and are thought to record the oxygenation of the

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  • Research

    Nov 15 2019  Geologists have accepted that the global Banded Iron Formations BIF were formed in an event that happened a long time ago It was an unusual one off event This is different than many other types of mineralisation whose process are on going.

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    Microbiological processes in banded iron formation deposition

    Banded iron formations have been studied for decades particularly regard ing their potential as archives of the Precambrian environment 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.

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  • Extensive deposition of banded iron formations was

    Mar 27 1986  Precambrian banded iron formations BIFs consist of alternating layers of silica and iron minerals such as haematite magnetite and siderite1 2 but

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  • Banded Iron Formations Australia

    The banded iron formations BIFs of Karijini Gorge in Western Australia are distinctive units of sedimentary rock that are almost always of Precambrian age This unique formation is the largest iron deposit on Earth and records evidence of what early oceans were like.

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