Microfacies and origin of some Archean cherts (Pilbara, Australia
Seafloor silicification and hardground development during deposition of 2.5 Ga banded iron formations Geology. The BIF-Hosted High-Grade Iron Ore Deposits in the Archean Koolyanobbing Greenstone Belt, Western Australia: Structural Control on Synorogenic- and Weathering-Related Magnetite-, Hematite-, and Goethite-rich Iron Ore ...
Evidence for abundant organic matter in a Neoarchean banded iron …
Microbial Fe(II) oxidation has been proposed as a major source of Fe minerals during deposition of banded iron formations (BIFs) in the Archean and Proterozoic Eons. The conspicuous absence of organic matter or graphitic carbon from BIFs, however, has given rise to divergent views on the importance of such a biologically mediated iron cycle. Here, we present mineral associations, …
A craton-wide geochemical survey of late Archean banded iron …
Banded iron formations occur extensively throughout nearly all of the late Archean (∼2.6–2.5 Ga) lithotectonic assemblages of the NCC (Fig. 1; Zhang et al., 2012). The late Archean BIFs commonly occur in successions of supracrustal rocks (e.g., greenstone belts), mostly in close association with mafic metamorphosed volcanic rocks (Fig. 2).
An epigenetic origin for Archean banded iron-formation-hosted …
contrasting fluid types at the nevoria gold deposit in the southern cross greenstone belt, western australia: implications of auriferous fluids depositing ores within an archean banded iron-formation
An epigenetic origin for Archean banded iron-formation …
DOI: 10.2113/GSECONGEO.79.1.162 Corpus ID: 129657409; An epigenetic origin for Archean banded iron-formation-hosted gold deposits @article{Phillips1984AnEO, title={An epigenetic origin for Archean banded iron-formation-hosted gold deposits}, author={George N. Phillips and David Ian Groves and J. E. Martyn}, journal={Economic Geology}, year={1984}, volume={79}, …
An iron shuttle for deepwater silica in Late Archean and …
Iron formations are typically thinly bedded or laminated sedimentary rocks containing 15% or more of iron and a large proportion of silica (commonly >40%). In the ca. 2590–2460 Ma Campbellrand-Kuruman Complex, Transvaal Supergroup, South Africa, iron formation occurs as a sediment-starved deepwater facies distal to carbonates and shales.
(PDF) Photoferrotrophy, BIF deposition, and iron-free
Banded iron formation (BIF) deposition was the likely result of oxidation of ferrous iron in seawater by either oxygenic photosynthesis or iron-dependent anoxygenic photosynthesis—photoferrotrophy.
(PDF) Archean Banded Iron Formations from the Dharwar
Archean Banded Iron Formations from the Dharwar Craton, Southern India: Implications for the Redox State of Archean Oceans September 2023 DOI: 10.13140/RG.2.2.18113.74083
Protection of phototrophic iron (II)-oxidizing bacteria from …
On the Archean Earth (4.0–2.5 Ga) the lack of a protective ozone layer meant that harmful ultraviolet radiation (UVR) reached the surface almost unattenuated. For survival, primitive photosynthetic bacteria would have required strategies preventing UV-induced damage to their DNA. At that time, a fraction of the planktonic cells were likely anoxygenic …
The Archean atmosphere | Science Advances
The environment of the Archean eon from 4 to 2.5 billion years (Ga) ago has to be understood to appreciate biological, geological, and atmospheric evolution on our planet and Earth-like exoplanets [e.g., (1, 2)].Its most distinguishing …
Phototrophic Fe(II) oxidation in an atmosphere of H2
Recent studies have explored the long-standing proposition that Archean banded iron formations may have been formed, and diagenetically modified, by anaerobic microbial metabolisms. These efforts ...
Ward's® Banded Iron Formation
A sawn and lacquered slab of classic Precambrian banded layers of hematite (iron) and quartz. Average size: 3" x 4". Ontario, Canada. Rock specimens are useful for studying textures, grain …
Genesis of Archean to Paleoproterozoic banded iron …
The source characteristics and depositional environments of banded iron formations (BIFs) can provide key information on the chemical composition, redox environment, and tectonic evolution of early Precambrian paleo-oceans. Large quantities of Neoarchean to Paleoproterozoic BIFs are exposed in the North China Craton (NCC). This study focuses on petrography, major …
Banded Iron Formations (BIFs)
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 other minerals …
Archean Banded Iron
Collected by Joe Herman, 4-21-96 as part of South Fork Big Nemaha Survey. The work we do to discover, preserve, and share Nebraska's history wouldn't be possible without …
8.25" Polished Tiger Iron "Stromatolite" Slab
HERE ARE SOME OTHER SIMILAR FOSSILS FOR SALE 11.7" Polished Tiger Iron "Stromatolite" Slab - 3.2 Billion Years $345 $ ... its formation along with the formation of other Precambrian banded iron formations is indirectly due to the cyanobacteria that formed stromatolites. Oxygen was not present in the early atmosphere, but arose as a byproduct of ...
archean rock for sale | eBay
Get the best deals for archean rock at eBay. We have a great online selection at the lowest prices with Fast & Free shipping on many items!
Updating the Geologic Barcodes for South China: Discovery …
Banded iron formations (BIFs) in Archean cratons provide important "geologic barcodes" for the global correlation of Precambrian sedimentary records. Here we report the first finding of late Archean BIFs from the Yangtze Craton, one of largest Precambrian blocks in East Asia with an evolutionary history of over 3.3 Ga.
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 …
Geochemistry of some banded iron-formations of the Archean …
The geochemical results of the banded iron-formations are used to address questions regarding the thermal regime of the basin floor, the redox conditions of the sea bottom water and source of the Fe and other elements in these banded iron-formations. Keywords. Archean; banded iron-formation; geochemistry; hydrothermal fluids; seawater. J.
Temperature fluctuations in the Archean ocean as trigger for …
Banded iron formations (BIFs) are Fe- and Si-rich chemical sediments that were deposited in the oceans throughout the Archean Eon (4.0–2.5 billion years ago; Ga).
Rare earth element variations in mid-Archean banded iron …
Rare earth element variations in mid-Archean banded iron formations: implications for the chemistry of ocean and continent and plate tectonics. Author links open overlay ... dominantly of quartz with minor amounts of goethite, hematite, and/or kaolin minerals and illite. The overlying banded iron-rich rock (BI-2) is composed of hematite, quartz ...
Banded Iron Formation for sale | eBay
Get the best deals for Banded Iron Formation at eBay. We have a great online selection at the lowest prices with Fast & Free shipping on many items!
Banded Iron Formation
Banded iron formations (BIFs) comprise the largest iron resource on Earth. They formed throughout much of the Precambrian (∼3800–543 Ma), reaching their maximum abundance between 2700 and 2400 Ma ago. Numerous examples can be found on almost every continent. ... (>250 °C) to Archean seawater caused by a hotter mantle (Arndt 1991). The ...
Abiotic anoxic iron oxidation, formation of Archean banded iron
Iron in the early anoxic oceans of Archean age (4000-2500 million years ago) is believed to have been oxidized to form banded iron formations (BIF).
Evidence for abundant organic matter in a Neoarchean banded iron …
Microbial Fe(II) oxidation has been proposed as a major source of Fe minerals during deposition of banded iron formations (BIFs) in the Archean and Proterozoic Eons. The conspicuous absence of organic matter or graphitic carbon from BIFs, however, has given rise to divergent views on the importance of such a biologically mediated iron cycle.
Banded Tiger Iron "Stromatolite"
About Tiger Iron Tiger Iron is composed mainly of tiger's eye, red jasper, and black hematite in an undulating banded pattern.It is mined primarily in two large deposits, one in South Africa and the other in Western Australia. Both deposits are over 2 billion years old!
Archean Continental Crustal Accretion and Banded Iron …
The Huoqiu iron deposits with a typical banded iron formation (BIF) are hosted by Precambrian high-grade metamorphic rocks, mostly occurring as metasedimentary rocks. From three BIF samples 88 detrital zircons have been collected, they display clear oscillatory zoning, high Th/U ratio, and low to variable luminescence, indicating magmatic origin.
NEW! Stromatolite Banded Iron Formation, Archean, WY, …
Archean Era. 2.7 Billion years. Excellent safety. Weight is 95 grams. Banded Iron Formation. Seminoe Formation. GOOD LUCK. Carbon Co., Wyoming, USA.
9600 Banded Iron Ln, Denton, TX 76207
9600 Banded Iron Ln, Denton TX, is a Single Family home that contains 1655 sq ft and was built in 2022.It contains 2 bedrooms and 2 bathrooms. The Zestimate for this Single Family is $496,200, which has decreased by $2,680 in the last 30 days.The Rent Zestimate for this Single Family is $2,403/mo, which has increased by $2,403/mo in the last 30 days.