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  • Iron-Oxide Concretions and Nodules, 1 Some Meteorite ...

    Iron oxide concretions, iron oxide nodules, and ironstones are often mistaken for meteorites because their unusual shapes catch people’s attention and they are denser than most other rocks. Hematite concretions form by precipitation of iron oxide from iron rich solutions. Hematite nodules are often formed in sedimentary rocks by oxidation of pyrite or marcasite (iron sulfide) crystals ...

  • IRON OXIDE CONCRETIONS - Yola

    The iron oxide which comprises these concretions has been derived mainly from the chemical weather-ing of iron-rich minerals in local rocks. In particular, pyrite is abundant in some of the Cretaceous rocks, and this weathers rapidly on exposure to groundwater to form iron oxides. We have recognised a number of info rmal, descriptive catego ries of ironstone conc retions from this area: 1 ...

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  • Concretion - Wikipedia

    OverviewTypes of concretionOriginsAppearanceCompositionOccurrenceSee alsoCitations

    Concretions vary considerably in their compositions, shapes, sizes and modes of origin. Septarian concretions or septarian nodules, are concretions containing angular cavities or cracks, called "septaria". The word comes from the Latinword septum; "partition", and refers to the cracks/separations in this kind of rock. Some websites incorrectly derive the term from the Latin word septem, meaning "seven". Cracks are highly variable in shape and volume, as well as the degree of shrinkage they indica

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  • Moqui marbles naturally occurring iron oxide concretions ...

    25 Million Old Moqui marbles naturally occurring iron oxide concretions that arise from Navajo sandstone. Walkers wandering through the sandy canyons of Utah sometimes come across a strange sight. Where the Navajo Sandstone loses its iconic peach, orange, and red stripes, hundreds of round, iron-coated stones often litter the ground. Sandstone balls are cemented with a strong layer of iron ...

  • Iron-Oxide Concretions and Nodules, 2 Some Meteorite ...

    This concretion appears to have started as a mass of pyrite crystals (iron sulfide, cubic) and is in the process of oxidizing to iron oxide. This thing started out as a several pyrite crystals but is now largely oxidized to hematite. This is a cluster of pyrite crystals beginning to oxidize to hematite. Pennsylvania. This one is fascinating in that one side (bottom) has a texture like some ...

  • Concretion - an overview ScienceDirect Topics

    In order to verify the possible presence of high coercivity iron oxide minerals in the concretions, material from globules extracted from different depth levels from the B t 2 and C k 1 horizons of the OK Planosol are used for magnetic remanence measurements. A stepwise acquisition of IRM is carried out for material from ten depth levels. The IRM acquisition curves are depicted in Fig. 4.6.3 ...

  • Fe-oxide concretions formed by interacting carbonate and ...

    1/12/2018  Iron oxide concretions have slightly lower δ 56 Fe (~ −1.5‰) compared with Fe oxides in the matrix of the Navajo Sandstone (~ +0.3‰). In the previous study, the difference of Fe isotope values was explained by reduction of Fe in the iron oxide source and some subsequent oxidation. However, this fractionation of iron isotopes between the ...

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  • Concretions Picture Gallery - ThoughtCo

    24/08/2017  Concretions are hard bodies that form in sediments before they become sedimentary rocks. Slow chemical changes, perhaps related to microbial activity, cause minerals to come out of the groundwater and seal the sediment together. Most often the cementing mineral is calcite, but the brown, iron-bearing carbonate mineral siderite is also common. Some concretions have a central particle,

  • Rinded iron-oxide concretions: hallmarks of altered ...

    Rinded iron-oxide concretions 1771 2012 The Authors. Journal compilation 2012 International Association of Sedimentologists, Sedimentology, 59, 1769–1781. and 2). The concretions range from spheroids less than 10 mm in diameter to platter-shaped masses up to 8 cm thick and 50 cm across. Most concretions are ovoids or spheroids (Fig. 3A to C), but spindle shapes are also common (Fig.

  • Navajo Sandstone - Wikipedia

    OverviewIron oxide concretionsDescriptionAge and history of investigationDepositional environmentOutcrop localitiesSee alsoFurther reading

    The Navajo Sandstone is also well known among rockhounds for its hundreds of thousands of iron oxide concretions. Informally, they are called "Moqui marbles" and are believed to represent an extension of HopiNative American traditions regarding ancestor worship ("moqui" translates to "the dead" in the Hopi language). Thousands of these concretions weather out of outcrops of the Navajo Sandstone within south-central and southeastern Utah within an area extending from Zion National Park eastward to Arc

  • Wikipedia CC-BY-SA 许可下的文字
  • Concretion - an overview ScienceDirect Topics

    In order to verify the possible presence of high coercivity iron oxide minerals in the concretions, material from globules extracted from different depth levels from the B t 2 and C k 1 horizons of the OK Planosol are used for magnetic remanence measurements. A stepwise acquisition of IRM is carried out for material from ten depth levels. The IRM acquisition curves are depicted in Fig. 4.6.3 ...

  • Characteristics of Terrestrial Ferric Oxide Concretions ...

    Precipitation of iron oxide cement–forming concretions is enhanced by oxidation and by rising pH. Precipitation takes place on eolia consisting of K-feldspar grains and illite rims on quartz grains. A small concretion may form around a single grain, but larger concretions incorporate many detrital grains of feldspar. Both feldspar and illite rims on quartz grains chemically react with ...

  • Researchers propose a new theory to explain iron-oxide ...

    6/12/2018  A team of researchers from Japan, Mongolia and the U.K. has developed a new theory to explain the origin of iron-oxide concretions (hard, solid

  • Composition, nucleation, and growth of iron oxide

    1/01/2011  Iron oxide concretions are formed from post depositional, paleogroundwater chemical interaction with iron minerals in porous sedimentary rocks. The concretions record a history of iron mobilization and precipitation caused by changes in pH, oxidation conditions, and activity of bacteria. Transport limited growth rates may be used to estimate the duration of fluid flow events. The Jurassic ...

  • iron oxide concretions,batu penggilingan garam pabrik ...

    Iron oxide (e.g. hematite, goethite) sandstone coloration and concretions are significant indicators of the mobility of iron in groundwater and host rock properties such as porosity and permeability. Iron oxide concretions typically lack any obvious nucleus ( Chan et al. 2004, 2005 ) and appear to form in different ways from simple attractive growth around a physical ‘seed’ nucleus ...

  • Iron oxide coloration and concretions of the Lower ...

    Clustered iron oxide concretions typically show weak cemented rinds to form recessive weathering patterns in the host rock. Where clustered forms flare from upper bedding plane surfaces, the distributions suggest relationships to microbial or organic matter that were sites for preferential iron oxide mineralization. Although it is difficult to decipher the origin and timing of the iron-rich ...

  • Rinded iron-oxide concretions: hallmarks of altered ...

    Rinded iron-oxide concretions 1771 2012 The Authors. Journal compilation 2012 International Association of Sedimentologists, Sedimentology, 59, 1769–1781. and 2). The concretions range from spheroids less than 10 mm in diameter to platter-shaped masses up to 8 cm thick and 50 cm across. Most concretions are ovoids or spheroids (Fig. 3A to C), but spindle shapes are also common (Fig.

  • Fe-oxide concretions formed by interacting carbonate and ...

    Iron oxide concretions have slightly lower δ 56 Fe (~ −1.5‰) compared with Fe oxides in the matrix of the Navajo Sandstone (~ +0.3‰). In the previous study, the difference of Fe isotope values was explained by reduction of Fe in the iron oxide source and some subsequent oxidation. However, this fractionation of iron isotopes between the ...

  • Concretions Picture Gallery - ThoughtCo

    24/08/2017  Concretions are hard bodies that form in sediments before they become sedimentary rocks. Slow chemical changes, perhaps related to microbial activity, cause minerals to come out of the groundwater and seal the sediment together. Most often the cementing mineral is calcite, but the brown, iron-bearing carbonate mineral siderite is also common. Some concretions have a central particle,

  • Iron oxide sweat stains in sandstone - Mountain Beltway ...

    19/08/2015  Iron oxide sweat stains in sandstone 7 Comments. Mauri Pelto says: 19 August 2015 at 16:29 I have seen this is volcanic tuffs too, would the mechanism be the same. Reply. Callan says: 19 August 2015 at 16:30 Me too – yes; I would think it would be identical. Reply. Lois Martin says: 20 August 2015 at 12:53 Thanks for the pictorial, the hat (MSU-good choice) explains it perfectly. Reply. Fred ...

  • Iron isotopes constrain the pathways and formation ...

    Iron isotope compositions of oxide concretions in the Navajo Sandstone document reductive dissolution of early diagenetic oxides, aqueous transport, and finally precipitation in an open groundwater terrestrial system. Although the mineralogy and inferred fluid chemistry of the Navajo concretions have some important differences from Mars concretions, Fe isotopes should be similarly valuable in ...

  • Iron oxide coloration and concretions of the Lower ...

    Clustered iron oxide concretions typically show weak cemented rinds to form recessive weathering patterns in the host rock. Where clustered forms flare from upper bedding plane surfaces, the distributions suggest relationships to microbial or organic matter that were sites for preferential iron oxide mineralization. Although it is difficult to decipher the origin and timing of the iron-rich ...

  • Iron Oxide Concretions Stock Photos Iron Oxide ...

    Find the perfect iron oxide concretions stock photo. Huge collection, amazing choice, 100+ million high quality, affordable RF and RM images. No need to register, buy now!

  • iron oxide concretions,batu penggilingan garam pabrik ...

    Iron oxide (e.g. hematite, goethite) sandstone coloration and concretions are significant indicators of the mobility of iron in groundwater and host rock properties such as porosity and permeability. Iron oxide concretions typically lack any obvious nucleus ( Chan et al. 2004, 2005 ) and appear to form in different ways from simple attractive growth around a physical ‘seed’ nucleus ...

  • Composition, nucleation, and growth of iron oxide

    Iron oxide concretions are formed from post depositional, paleogroundwater chemical interaction with iron minerals in porous sedimentary rocks. The concretions record a history of iron mobilization and precipitation caused by changes in pH, oxidation conditions, and activity of bacteria. Transport limited growth rates may be used to estimate the duration of fluid flow events.

  • iron and limonite - schoonwatervoormozambique.nl

    Iron oxide concretions, iron oxide nodules, and ironstones are often mistaken for meteorites because their unusual shapes catch people's attention and they are denser than most other rocks Hematite concretions form by precipitation of iron oxide from iron rich solutions. Limonite. Limonite usually forms from the hydration of hematite and magnetite, from the oxidation and hydration of iron rich ...

  • (PDF) Structural control on the formation of iron-oxide ...

    Iron-oxide concretions are overprinted and displaced by multiple slip surfaces (broken white lines), and by joints forming an angle of ~45 ° with respect to the master slip surface.

  • Iron isotopes constrain the pathways and formation ...

    Iron oxide concretions on both Mars and Earth are valuable records of diagenetic, postdepositional changes in sedimentary units because they preserve evi-dence of ancient groundwater fl ow (Chan et al., 2004, 2005; Ormö et al., 2004; McLennan et al., 2005), fl uid-rock interactions, element cycling, and the presence of redox boundaries. The con- cretions typically have spherical ...

  • THE GEOLOGIC CONTEXT OF WONDERSTONE: A

    Rinded iron-oxide concretions: hallmarks of altered siderite masses of both early and late diagenetic origin: Sedimentology, v. 59, p. 1769–1781. LUDVIGSON, G.A., AND RAVN, R.L., 1996, New insights on the sequence stratigraphic architecture of the Dakota Formation in Kansas–Nebraska–Iowa from a decade of sponsored research activity: Current Research in Earth Sciences, Bulletin 258, p ...

  • Pedogenic hematitic concretions from the Triassic New ...

    Pedogenic hematitic concretions from the Triassic New Haven Arkose, Connecticut: Implications for understanding Martian diagenetic processes J.H. Wilson a,⁎, S.M. McLennan a, T.D. Glotch a, E.T. Rasbury a, E.H. Gierlowski-Kordesch b, R.V. Tappero c a Department of Geosciences, SUNY at Stony Brook, Stony Brook, NY, 11794-2100, USA b Department of Geological Sciences, Ohio University,

  • Characteristics and genesis of nodules and concretions ...

    The proportion of anhydrous iron oxides (hematite. maghemite) to hydrated ir~lIl oxide ... 107); C, ferruginous concretions in Vcrtisol (Loc. 112); D, fl'rri-manganiferous ~ollcretion8 in Vertisol (Loc. 113). 412 M. MITSUCHI Fig. 2. Photomicrograph, of the nodulea and concretiona. AI: FerruginoUi nodule in GleYlol (Loc. 115). Skeleton grainl (S) are cemented with dark red and yellow brown ...

  • Iron oxide coloration and concretions of the Lower ...

    Clustered iron oxide concretions typically show weak cemented rinds to form recessive weathering patterns in the host rock. Where clustered forms flare from upper bedding plane surfaces, the distributions suggest relationships to microbial or organic matter that were sites for preferential iron oxide mineralization. Although it is difficult to decipher the origin and timing of the iron-rich ...

  • iron oxide concretions,batu penggilingan garam pabrik ...

    Iron oxide (e.g. hematite, goethite) sandstone coloration and concretions are significant indicators of the mobility of iron in groundwater and host rock properties such as porosity and permeability. Iron oxide concretions typically lack any obvious nucleus ( Chan et al. 2004, 2005 ) and appear to form in different ways from simple attractive growth around a physical ‘seed’ nucleus ...

  • iron-oxide concretions nodules 99 (With images)

    iron-oxide concretions nodules 99. Native American Tools Native American Artifacts Native American Indians Native Americans Indian Artifacts Ancient Artifacts Flint Rock Stone Age Tools Ancient Aliens. More information... Saved by Kathy Reynolds. 20. People also love these ideas. Ancient Ruins Ancient Artifacts Ancient History Esoteric Symbols Sumerian Mystery Of History Homo Indus Ancient ...

  • Composition, nucleation, and growth of iron oxide

    Iron oxide concretions are formed from post depositional, paleogroundwater chemical interaction with iron minerals in porous sedimentary rocks. The concretions record a history of iron mobilization and precipitation caused by changes in pH, oxidation conditions, and activity of bacteria. Transport limited growth rates may be used to estimate the duration of fluid flow events.

  • Morphologic Clues to the Origins of Iron Oxide–Cemented ...

    Concretions cemented by iron oxide are abundant and diverse in the Jurassic Navajo Sandstone of southern Utah. Some of these structures are considered terrestrial analogs for concretions imaged on Mars. The Navajo concretions can be spheroidal, pipelike, or tabular with multicompartmented boxworks. These iron oxide concretions typically display a rinded structure: dense sandstone rinds ...

  • Pseudofossils: Concretions and dendrites

    Concretions consisting of concentric layers of dark brown iron oxide deposited around a nucleus are amongst the most common type. Removal of the nucleus in some way can result in the concretion being hollow. This type of concretion forms during weathering of sedimentary rocks, such as sandstones, that contain large amounts of iron. In some sandstone, pyrite (iron sulphide) may form part of the ...

  • Iron isotopes constrain the pathways and formation ...

    Iron oxide concretions on both Mars and Earth are valuable records of diagenetic, postdepositional changes in sedimentary units because they preserve evi-dence of ancient groundwater fl ow (Chan et al., 2004, 2005; Ormö et al., 2004; McLennan et al., 2005), fl uid-rock interactions, element cycling, and the presence of redox boundaries. The con- cretions typically have spherical ...

  • Pedogenic hematitic concretions from the Triassic New ...

    Pedogenic hematitic concretions from the Triassic New Haven Arkose, Connecticut: Implications for understanding Martian diagenetic processes J.H. Wilson a,⁎, S.M. McLennan a, T.D. Glotch a, E.T. Rasbury a, E.H. Gierlowski-Kordesch b, R.V. Tappero c a Department of Geosciences, SUNY at Stony Brook, Stony Brook, NY, 11794-2100, USA b Department of Geological Sciences, Ohio University,

  • How Utah's Fantastical Moqui Marbles Formed Live Science

    22/09/2014  The stony spheres are concretions — sandstone balls cemented by a hard shell of iron oxide minerals. Often called moqui marbles, acres of the