iron oxide concretions

iron oxide concretions

Iron-Oxide Concretions and Nodules | Some Meteorite ...

2 天前 · Iron-oxide nodules or concretions are the most common kind of meteorwrong sent to us. Hematite and magnetite are two common iron-oxide minerals. Most iron ore deposits consist mainly of hematite, magnetite, or both. Iron-oxide concretions, iron-oxide nodules, and ironstones are often mistaken for meteorites because they are heavy (dense) and their unusual (frequently bizarre!)

IRON OXIDE CONCRETIONS - Yola

2011-4-12 · 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.

Composition, nucleation, and growth of iron oxide

2011-1-1 · Iron oxide concretions form in porous sandstone by chemical reduction and solution of iron minerals, transport of Fe 2+ in solution, and precipitation of hydrous ferric oxide by oxidation. Concretions form quickly in 1000's of years by diffusion and advection, and K

Iron oxide concretions as raw material for iron IIA iron ...

2020-12-1 · Iron oxide concretions are formed from post-depositional, paleo-groundwater chemical interaction with iron minerals in porous sedimentary rocks (Chan et al., 2007). The concretions record a history of iron mobilization and precipitation, caused by changes in

Iron-Oxide Concretions and Nodules | Some Meteorite ...

Iron-Oxide Concretions and Nodules. I was given the stones above as a child by my grandmother. I do not know where she got them, but she was from New York state. She called them “Indian paint pots.” (See, for example, Garvies Point concretions ). The stones are hematite concretions used by Native Americans to paint their faces.

OVERVIEW OF IRON OXIDE CONCRETIONS AND

2009-1-15 · Iron oxide concretions typically lack a nucleus which is an important observation in interpreting how concretions grow. A suprising result of concretion structure and crystal growth examinations are a com-40th Lunar and Planetary Science Conference (2009) 2187.pdf. ponent of inward growth (much like a geode), as op- ...

Models of iron oxide concretion formation: field ...

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 por-osity 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 ...

Understanding genesis of iron oxide concretions present

2021-2-26 · Abstract The iron oxide concretions of Shankargarh (Allahabad), India belongs to Dhandraul Sandstone of Vindhyan Supergroup. Petrography of concretions shows abundant quartz grains embedded within the iron oxide cementation. XRD analysis of the concretion shows diagnostic peaks for quartz, hematite, and goethite. The A–CN–K and A–CNK–FM ternary diagrams drawn for concretion

Rinded iron‐oxide concretions: hallmarks of altered ...

2012-2-3 · Iron‐bearing concretions are valuable records of oxidation states of subsurface waters, but the first concretions to form can be altered drastically during later diagenetic events. Distinctive concretions composed of heavy rinds of iron oxide that surround iron‐poor, mud‐rich cores are common along bases of fluvial cross‐bed sets of the ...

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

2020-9-5 · Abstract 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 ...

IRON OXIDE CONCRETIONS - ozgeotours.yolasite

2021-6-12 · 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.

Iron-Oxide Concretions and Nodules | Some Meteorite ...

Iron-Oxide Concretions and Nodules. I was given the stones above as a child by my grandmother. I do not know where she got them, but she was from New York state. She called them “Indian paint pots.” (See, for example, Garvies Point concretions ). The stones are hematite concretions used by Native Americans to paint their faces.

OVERVIEW OF IRON OXIDE CONCRETIONS AND

2009-1-15 · Iron oxide concretions typically lack a nucleus which is an important observation in interpreting how concretions grow. A suprising result of concretion structure and crystal growth examinations are a com-40th Lunar and Planetary Science Conference (2009) 2187.pdf. ponent of inward growth (much like a geode), as op- ...

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

2012-9-19 · the iron-rich concretions are localized at joints (Loope et al., 2010) and the central zones of some concretions contain iron-oxide pseudomorphs after siderite (Loope et al., 2011). These relation-ships indicate not only that the concretions of the Navajo Sandstone had siderite precursors, but also that these formed during late diagenesis.

Understanding genesis of iron oxide concretions present

2021-8-19 · iron oxide concretions, and host sandstone to understand the formation process of iron oxide concretions. Additionally, the Fe bearing pale-oCuid circulation, redox processes, and elemental mobility (enrichment and depletion of elements) are discussed in detail using geochemistry of Shankargarh iron oxide concretions and associated sandstone.

Models of iron oxide concretion formation: field ...

2007-6-6 · Well-exposed Jurassic Navajo Sandstone iron oxide concretions preserve important diagenetic records of groundwater flow and water–rock interactions. Field relationships, precipitation patterns, and geometries of the Navajo concretions provide the basis for input parameters in numerical computer simulations and laboratory chemical bench tests.

Rinded iron-oxide concretions: Hallmarks of altered ...

2020-6-11 · demonstrate that concretions with iron-oxide rinds and iron-poor cores are the hallmarks of altered siderite masses. Because this insight pro-vides a view back in time, beyond the most recent episode of diagen - esis, it allows a more accurate reconstruction of temporal changes in pore water chemistry. For example, it was the distribution of ...

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

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

2020-9-5 · Abstract 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 ...

Rinded, Iron-Oxide Concretions in Navajo Sandstone

2020-10-13 · other concretions, they are not strongly cemented throughout, but instead, the iron oxide is concentrated in a very strongly cemented, sharply defined, exterior rind or shell. In the smaller concretions, the entire interior lacks iron-oxide cement, and is similar to the rock outside the concretion; in the larger concretions, there is a cen-

OVERVIEW OF IRON OXIDE CONCRETIONS AND

2009-1-15 · Iron oxide concretions typically lack a nucleus which is an important observation in interpreting how concretions grow. A suprising result of concretion structure and crystal growth examinations are a com-40th Lunar and Planetary Science Conference (2009) 2187.pdf. ponent of inward growth (much like a geode), as op- ...

Understanding genesis of iron oxide concretions present

2021-8-19 · iron oxide concretions, and host sandstone to understand the formation process of iron oxide concretions. Additionally, the Fe bearing pale-oCuid circulation, redox processes, and elemental mobility (enrichment and depletion of elements) are discussed in detail using geochemistry of Shankargarh iron oxide concretions and associated sandstone.

Rinded, Iron-Oxide Concretions in Navajo Sandstone

2020-10-13 · other concretions, they are not strongly cemented throughout, but instead, the iron oxide is concentrated in a very strongly cemented, sharply defined, exterior rind or shell. In the smaller concretions, the entire interior lacks iron-oxide cement, and is similar to the rock outside the concretion; in the larger concretions, there is a cen-

Rinded iron-oxide concretions: Hallmarks of altered ...

2020-6-11 · demonstrate that concretions with iron-oxide rinds and iron-poor cores are the hallmarks of altered siderite masses. Because this insight pro-vides a view back in time, beyond the most recent episode of diagen - esis, it allows a more accurate reconstruction of temporal changes in pore water chemistry. For example, it was the distribution of ...

Characterization of iron oxides in Fe-rich concretions ...

2006-8-6 · (2004). Characterization of iron oxides in Fe-rich concretions from an imperfectly-drained Greek soil: a study by selective-dissolution techniques and X-ray diffraction. Archives of Agronomy and Soil Science: Vol. 50, No. 4-5, pp. 485-493.

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

LABORATORY EXPERIMENTS TO STUDY SPHERICAL,

2006-1-9 · solid iron-oxide concretions with rinds, but possibly also “onion layering” and massive forms. The experi-ments do not intend to simulate the exact chemistry of either the Utah or the Meridiani environment. How-ever, these studies can elucidate the physical process of concretion growth, which may have applications to

(PDF) Models of iron oxide concretion formation: Field ...

2007-8-1 · Jurassic Navajo Sandstone: (A) examples of different sizes of common spherical iron oxide concretions: (B–C) common concretion accumulations, (D) in situ concretions, (E) mixed populations of ...

FOR IDENTIFYING COMMON ROCK AND FOSSIL

2017-1-17 · 3.1.1 Iron Oxide Concretions Iron Oxide or Ironstone concretions are most commonly found in the late Cretaceous age Eastend and Frenchman Formations (Figure 3). They most often form when balls of clay within sand river channels absorb iron from the groundwater. They are usually very dense due to their high iron content and are often ...

(PDF) Models of iron oxide concretion formation: field ...

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 (Mozley 2003). The peri- 40 cm odic and dispersed occurrence patterns of the concretions, often pervasive through vast localities, are consistent with C ...