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Siderite And Pyrite

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Siderite And Pyrite

Siderite-based anaerobic iron cycle driven by autotrophic

Using a sample from a terrestrial hot spring (pH 6.8, 60 °C), we enriched a thermophilic microbial consortium performing anaerobic autotrophic oxidation of hydrothermal …

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Nanoparticulate apatite and greenalite in oldest, …

Here, we report greenalite and fluorapatite (FAP) nanoparticles in the oldest, well-preserved jaspilites from the ~3.5-billion-year Dresser Formation, Pilbara Craton, Australia. We argue that both phases are vent plume particles, …

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Sphaerosiderites as sensitive recorders of non‐marine …

In two sphaerosiderite horizons, sphaerosiderites contain pyrite inclusions with diameters >20 µm, and the pyrite inclusions themselves contain siderite inclusions.

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Sphaerosiderites as sensitive recorders of …

In two sphaerosiderite horizons, sphaerosiderites contain pyrite inclusions with diameters >20 µm, and the pyrite inclusions themselves contain siderite inclusions.

WhatsApp: +86 18221755073

Nanoparticulate apatite and greenalite in oldest, well …

Here, we report greenalite and fluorapatite (FAP) nanoparticles in the oldest, well-preserved jaspilites from the ~3.5-billion-year Dresser Formation, Pilbara Craton, Australia. We argue that both phases are vent plume particles, whereas coexisting hematite is linked to secondary oxidation.

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Coupled partitioning of Au and As into pyrite controls …

The partitioning of As and Au into pyrite was studied by replacing siderite (FeCO 3) by pyrite (FeS 2) by reacting the Fe carbonate with H 2 S-containing aqueous fluids under experimental conditions similar to those of CTGD formation (i.e., 200°C, fluid-dominated conditions, 0.05 m H 2 S, and

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Arsenic-poor fluids promote strong As partitioning into pyrite

Pyrite is consistently found at the outermost parts of the replaced siderite grains, while some siderite grains also display full replacement by pyrite (Fig. 1). In experiments with lower concentrations of the acetic acid buffer, the pyrite yield was highest with a mean phase content of 45 wt %.

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Siderite-based anaerobic iron cycle driven by autotrophic

Using a sample from a terrestrial hot spring (pH 6.8, 60 °C), we enriched a thermophilic microbial consortium performing anaerobic autotrophic oxidation of hydrothermal siderite (FeCO 3), with CO...

WhatsApp: +86 18221755073

Textures of different pyrite types: a) different types of pyrite

Arsenian pyrite is the major host mineral of gold in Carlin type gold deposit (CTGD) and forms during the interaction of H2S bearing hydrothermal fluids with Fe-bearing carbonates (e.g.,...

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Siderite

The most common iron carbonate is siderite (FeCO 3), a frequent constituent of carbonate sediments and rocks on Earth. Siderite has a low-temperature transition at 30–35 K (Housen et al., 1996), distinctively different from that of pyrrhotite (Section 5.08.3.9). Siderite is …

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Siderite

The most common iron carbonate is siderite (FeCO 3), a frequent constituent of carbonate sediments and rocks on Earth. Siderite has a low-temperature transition at 30–35 K (Housen et al., 1996), distinctively different from that of pyrrhotite (Section 5.08.3.9). Siderite is paramagnetic at ordinary temperatures and carries no NRM.

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The microbially driven formation of siderite in salt marsh …

The lack of pyrite and the presence of disseminated siderite in the incubated sediment suggest the heterogeneity of localized geochemistry within the sediment. This could partly explain the occurrence of siderite concretion only in certain microenvironment of the marsh.

WhatsApp: +86 18221755073

Textures of different pyrite types: a) different …

Arsenian pyrite is the major host mineral of gold in Carlin type gold deposit (CTGD) and forms during the interaction of H2S bearing hydrothermal fluids with Fe-bearing carbonates (e.g.,...

WhatsApp: +86 18221755073

Arsenic-poor fluids promote strong As partitioning into pyrite

Pyrite is consistently found at the outermost parts of the replaced siderite grains, while some siderite grains also display full replacement by pyrite (Fig. 1). In experiments with …

WhatsApp: +86 18221755073

Numerical Simulation of the Self‐Organizational Origin of

Our proposed numerical models yield results that closely align with the oscillatory zoning patterns observed in pyrite-siderite from the Xinqiao massive sulfide deposit in Central China.

WhatsApp: +86 18221755073

Coupled partitioning of Au and As into pyrite …

The partitioning of As and Au into pyrite was studied by replacing siderite (FeCO 3) by pyrite (FeS 2) by reacting the Fe carbonate with H 2 S-containing aqueous fluids under experimental conditions similar to those of …

WhatsApp: +86 18221755073

Partitioning of arsenic between hydrothermal fluid and …

Fluid mediated replacement of siderite by pyrite is a fast and effective process to transform Fe-bearing carbonates into sulfides that works via a coupled dissolution …

WhatsApp: +86 18221755073

The microbially driven formation of siderite in salt …

The lack of pyrite and the presence of disseminated siderite in the incubated sediment suggest the heterogeneity of localized geochemistry within the sediment. This could partly explain the occurrence of siderite concretion …

WhatsApp: +86 18221755073

Numerical Simulation of the Self‐Organizational …

Our proposed numerical models yield results that closely align with the oscillatory zoning patterns observed in pyrite-siderite from the Xinqiao massive sulfide deposit in Central China.

WhatsApp: +86 18221755073

Partitioning of arsenic between hydrothermal fluid and pyrite …

Fluid mediated replacement of siderite by pyrite is a fast and effective process to transform Fe-bearing carbonates into sulfides that works via a coupled dissolution-reprecipitation reaction.

WhatsApp: +86 18221755073