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