chemistry of geothite concretion

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Composition, nucleation, and growth of iron oxide ,
Composition, nucleation, and growth of iron oxide ,

Composition, nucleation, and growth of iron oxide concretions Composition, nucleation, and growth of iron oxide concretions Parry, WT 2011-01-01 00:00:00 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 ....

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YupRocks - Pictures of the Mineral Goethite
YupRocks - Pictures of the Mineral Goethite

Geothite is a mineral bearing iron hydroxide, belonging to the diaspore (a hydroxide of aluminum) class, seen in surroundings of low temperature and in soil Occurrence Goethite occurs ,...

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Composition, nucleation, and growth of iron oxide concretions
Composition, nucleation, and growth of iron oxide concretions

The goethite rim forms a protective layer of reduced porosity and permeability that inhibits chemical reactions with K-feldspar in the concretion interior with exterior solutions The porosity of the goethite rim is 18% ( Table 1 ) reducing permeability by 5 orders of magnitude ( Chidsey et al, 2007 )...

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Models of iron oxide concretion formation: field ,
Models of iron oxide concretion formation: field ,

age and chemistry of manganese mineralization in the Moab 2007 The Authors Journal Compilation 2007 Blackwell Publishing Ltd, Geofluids, 7, 1–13 Models of concretion formation 13 McLennan SM, Bell JF III, Calvin W, Christensen PR, Clark BC, chemical and isotopic composition...

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Biomineralization and Magnetic and Thermal Properties of ,
Biomineralization and Magnetic and Thermal Properties of ,

chemical reactions Consequently, study of the products of natural , make up the matrix of the concretion are goethite, maghemite, and hematite The thermal properties were analyzed using the...

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Characterization of Navajo Sandstone concretions: Mars ,
Characterization of Navajo Sandstone concretions: Mars ,

The purpose of this study is to characterize the physical and chemical attributes of concretions including external features (concretion shape, size and texture) as well as the internal structure, cement texture, mineralogy and diagenetic phas...

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Models of iron oxide concretion formation: field ,
Models of iron oxide concretion formation: field ,

Concretion chemistry Formation of concretions requires that reactants reach some level of super‐saturation (eg nucleation threshold) with respect to equilibrium precipitation The identity of the reactants differs with the chemical composition of the concretion...

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Models of iron oxide concretion formation: field, numerical ,
Models of iron oxide concretion formation: field, numerical ,

Concretion cement can be hematite or goethite, and sometimes both Large concretions (>5 cm diameter) commonly exhibit , Concretion chemistry Formation of concretions requires that reactants reach some level of super-saturation (eg nucleation threshold)...

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Advances in Chemical and Structural Characterization of ,
Advances in Chemical and Structural Characterization of ,

Advances in Chemical and Structural Characterization of Concretion with Implications for Modeling Marine Corrosion DONALD L JOHNSON,1,6 ROBERT J DEANGELIS,2 DANA J MEDLIN,3 JAMES D CARR,4 and DAVID L CONLIN5 1—National Park Service Submerged Resources Center, 14709 West Via Manana, Sun City West....

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Corrosion Studies on the USS Arizona with Application to a ,
Corrosion Studies on the USS Arizona with Application to a ,

The presence of goethite in the concretion rather than at the metal/concretion interface, as in the case of Arizona, may explain the higher iron content in the midget submarine concretion than in Arizona concretion...

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Limonite - Wikipedia
Limonite - Wikipedia

Limonite usually forms from the hydration of hematite and magnetite, from the oxidation and hydration of iron rich sulfide minerals, and chemical weathering of other iron rich minerals such as olivine, pyroxene, amphibole, and biotite...

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Characteristics of Terrestrial Ferric Oxide Concretions ,
Characteristics of Terrestrial Ferric Oxide Concretions ,

A 5-cm-diameter concretion with a rind 2 mm thick has a rind volume of 14 cm 3 that is 20% goethite and contains 8 g of Fe, but 0075 g of Fe is available in the surrounding pore flu Iron must therefore be supplied by pore fluid flow (approximate minimum of 100 pore volumes) or redistribution of Fe mineral within the surrounding rock...

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Tracing paleofluid circulations using iron isotopes: A ,
Tracing paleofluid circulations using iron isotopes: A ,

Iron concentrations and isotopic compositions were measured in spherical hematite and goethite concretions, together with associated red (Fe-oxide coated) and white (bleached) sandstones from the Jurassic Navajo formation, Utah (USA)...

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Carbonate concretions—explained | Request PDF
Carbonate concretions—explained | Request PDF

The chemical composition of the giant concretions is very homogeneous They formed during early burial by low Mg-calcite precipitation from meteoric pore waters...

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Mineralogy of some concretions in red from Zhejiang ,
Mineralogy of some concretions in red from Zhejiang ,

The concretions in red soils could be divided into three types:- (i) red concretion with low Feo/Fed ratio (dithionite and oxalate extractable iron), and high hematite and low Mn oxides contents; (ii) yellow concretion with low Feo/Fed ratio and only goethite present as crystalline Fe oxide, and low Mn oxide content; (iii) black/brown concretion with a high Feo/Fed ratio and only goethite as....

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Siderite: The mineral Siderite information and pictures
Siderite: The mineral Siderite information and pictures

Its chemical formula is (Fe,Mn)CO 3 Sideroplesite - Sideroplesite, also known as Magniosiderite , is a magnesium rich variety of Siderite , containing a greater amount of iron over magnesium...

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Goethite - WikiVisually
Goethite - WikiVisually

Goethite often forms through the weathering of other iron-rich minerals, and thus is a common component of soils, concentrated in laterite soils The formation of goethite is marked by the oxidation state change of Fe 2+ (ferrous) to Fe 3+ (ferric), which allows for goethite to exist at surface conditions Because of this oxidation state change, goethite is commonly seen as a pseudomorph...

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Characterization of Navajo Sandstone concretions: Mars ,
Characterization of Navajo Sandstone concretions: Mars ,

Read "Characterization of Navajo Sandstone concretions: Mars comparison and criteria for distinguishing diagenetic origins, Earth and Planetary Science Letters" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips...

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Histological, chemical, and morphological reexamination of ,
Histological, chemical, and morphological reexamination of ,

Histological, chemical, and morphological reexamination , goethite, and/or hematite differentially cementing the local sandstone, are hypothesized to form through mixing of , proposed that if the structure is a concretion, the chemistry of the structure should be consistent with a geological Naturwissenschaften...

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Earth and Planetary Science Letters
Earth and Planetary Science Letters

Chemical and mineralogical gradients (μm- to mm-scale) are identified with QEMSCAN (Quantitative , Goethite is present along interior edges of rinds and throughout the interiors of layered and solid , Concretion exteriors are typically either dark-colored or light-...

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Garvies Point Museum and Preserve - Concretions of Garvies
Garvies Point Museum and Preserve - Concretions of Garvies

Concretions of Garvies Point The concretions found on the beach at Garvies Point Preserve are commonly referred to as "Indian Paint Pots" or "Rattle Stones" These are composed of a combination of iron oxides which include hematite, limonite and goethite...

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(U-Th)/He geochronology and chemical compositions of ,
(U-Th)/He geochronology and chemical compositions of ,

To better under stand the ages, conditions of formation, and potential geologic significance of these diagenetic materials, we have measured (U-Th)/He ages and element concentrations in hematite, goethite, and Mn-oxide in Mesozoic sandstones from several locations in the Colorado Plateau...

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CHARACTERIZATION OF IRON-MANGANESE CONCRETIONS ,
CHARACTERIZATION OF IRON-MANGANESE CONCRETIONS ,

CHARACTERIZATION OF IRON-MANGANESE CONCRETIONS IN KENTUCKY ALFISOLS WITH PERCHED WATER TABLES MIN ZHANG AND A D KARATHANASIS , chemistry and mineralogy of concretions as a function of size, color and soil depth , concretion size Goethite was the only crystalline Fe oxide mineral identified by X-ray diffraction (XRD) ....

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wwwsstumsedumy
wwwsstumsedumy

Chemical weathering of basaltic rock in Kuantan area produced concretions , hematite, goethite, kaolinite and quartz The average concentrations of CE Zn, M, and Cu in concretions are 611 ppm, 35 ppm, , hematite and goethite KEYWORDS Concretion, bauxite, basaltic rock, major and ,...

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osion studies on the USS ...

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Concretions - DesertUSA
Concretions - DesertUSA

Concretions Composed of a carbonate mineral such as calcite A concretion is a compact mass of mineral matter, usually spherical or disk-shaped, embedded in a host rock of a different composition...

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Biomineralization and Magnetic and Thermal Properties of ,
Biomineralization and Magnetic and Thermal Properties of ,

chemical reactions Consequently, study of the products of natural biomineralization processes is important both for , make up the matrix of the concretion are goethite, maghemite, and hematite The thermal properties were analyzed using the Derivatograph Q1000 (MOM, Hungary) and syn...

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FAST AND SLOW PHOSPHATE SORPTION BY GOETHITE ,
FAST AND SLOW PHOSPHATE SORPTION BY GOETHITE ,

FAST AND SLOW PHOSPHATE SORPTION BY GOETHITE-RICH NATURAL MATERIALS J TORRENT, 1 U SCHWERTMANN, 2 AND V BARRg)N ~ , Bou 2 hollow root concretion ~ Qu, Ta 390 17 59 410 6 85 17 213 107 0 Bou 5a ferricrete ~ Qu, Chr, Ta 455 17 59 520 7 70 23 82 62 34 , Chemical and mineralogical characterization of the samples...

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(U-Th)/He geochronology and chemical compositions of ,
(U-Th)/He geochronology and chemical compositions of ,

Hematite-dominated samples show a broad positive correlation between age and U-Th concentrations, whereas most goethite-dominated samples show a negative correlation Exterior portions of spherical goethite concretion rinds have higher U-Th concentrations and younger (U ,...

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Research on the removal of calcareous and iron concretions ,
Research on the removal of calcareous and iron concretions ,

1 Research on the removal of calcareous and iron concretions from marine finds Zhang Zhiguo, Ma Qinglin, Li Naisheng, and Tian Xingling Department of Conservation Science and Technology for Underwater Cultural Relics...

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