Iron-oxide concretions and nodules 1 | Some Meteorite …
Hematite concretions form by precipitation of iron oxide from iron-rich solutions. Hematite nodules are often formed in sedimentary rocks like limestone by oxidation of pyrite or marcasite (iron sulfide) crystals.
Iron-oxide concretions and nodules 3 | Some Meteorite …
Many hematite concretions start out as masses of cubic pyrite (iron sulfide) crystals that oxidize to hematite (iron oxide). That’s what this one looks like.
Concretion - Wikipedia
A concretion is a hard, compact mass formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. [1] Concretions are often ovoid or spherical in shape, although irregular shapes also occur.
Iron-oxide concretions and nodules 2 | Some Meteorite …
More botryoidal hematite This is a cluster of pyrite crystals beginning to oxidize to hematite. Note the cubic crystals on upper left. 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.
Hematite concretions from the Late Jurassic Jhuran sandstone, …
2021年3月1日 · Mineralogical and spectroscopic studies of hematite concretions of Jhuran formation, Kutch are hematite and goethite. The hematite concretions are diagenetic in origin. The discovery of iron-bearing concretions is one of the most exciting discoveries in …
Active hematite concretion formation in modern acid saline lake ...
2008年4月15日 · Spheroidal hematite-cemented concretions are actively precipitating in shallow subsurface sediments at Lake Brown in Western Australia. Lake Brown is a hypersaline (total dissolved solids up to 23%) and acidic (pH ∼ 4) ephemeral lake.
Understanding genesis of iron oxide concretions present in
2021年2月26日 · 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 and host rock bulk composition clearly indicate the interaction of concretions rock with iron-bearing diagenetic fluids.
Introduction: Ubiquitous hematite spherules interpreted as being concretions [1] within reworked evaporite dune and interdune lake sediments [2] in the Meridiani Planum region of Mars have revealed a wealth of information about the role of acid saline wa-ters in the planet’s past.
Active hematite concretion formation in modem acid saline …
2008年2月18日 · Spheroidal hematite-cemented concretions are actively precipitating in shallow subsurface sediments at Lake Brown in Western Australia. Lake Brown is a hypersaline (total dissolved solids up to...
Iron-oxide concretions and nodules 4 | Some Meteorite …
Because of their high density, large hematite concretions have been used since prehistoric times for tools, often for breaking bones. This appears to be a Native American tool, found in Missouri, that was made from a hematite concretion.
Micrographs of Lake Brown hematite concretions. (A) Cross …
The hematite concretion in Utah is considered as the most probable terrestrial analogue based on a comparison of the sedimentology and stratigraphy characteristics in Utah sediments and...
Fe-oxide concretions formed by interacting carbonate and
2018年12月6日 · Spherical Fe-oxide concretions on Earth, especially in Utah, USA, have been investigated as an analog of hematite spherules found in Meridiani Planum on Mars to support interpretations of water-rock interactions in early Mars.
Characteristics of Terrestrial Ferric Oxide Concretions and ...
2012年1月1日 · Common spheroidal ferric oxide concretions form by diffusive coupled with advective mass transfer and share similar physical characteristics with hematite spherules from Meridiani Planum (Mars “blueberries”), investigated by the Mars Exploration Rover Opportunity.
City of Dearing, Fawn Creek Township, Montgomery County, …
Overview of City of Dearing, Fawn Creek Township, Montgomery County, Kansas, United States -- Histopolis.com - Collaborative Genealogy and History.
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Active hematite concretion formation in modern acid saline lake ...
2008年4月15日 · Spheroidal hematite-cemented concretions are actively precipitating in shallow subsurface sediments at Lake Brown in Western Australia. Lake Brown is a hypersaline (total dissolved solids up to 23%) and acidic (pH ∼4) ephemeral lake.
Composition, nucleation, and growth of iron oxide concretions
2011年1月1日 · 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.
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Fawn Creek, Montgomery County, Kansas Population and …
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