sidérite et pyrite

Coupled partitioning of Au and As into pyrite controls

The partitioning of As and Au into pyrite was studied by replacing siderite (FeCO3) by pyrite (FeS2) by reacting the Fe carbonate with H2S-containing aqueous fluids under …

Genesis and Geological Significance of Siderite in the First

However, although hydrothermal siderites are often found in metalliferous veins, there can be a separate siderite vein or one associated with ankerite, galena, …

Pyrite and siderite oxidation in swamp sediments

Differences in the processes of pyrite and siderite oxidation, in reclaimed swamp sediments of the Skjernå delta (Denmark), are described from sediment …

Siderite

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.

Reductive dissolution of pyrite by methanogenic archaea

Here, we show that methanogens can catalyze the reductive dissolution of FeS 2 at low temperature (≤38 °C) and utilize dissolution products to meet cellular iron …

Geochemical and mineralogical evidence for the formation …

In the study of Weibel et al. (2016), fluctuating groundwaters were found to be the main cause for the alternating physicochemical conditions of siderite formation. …

Sphaerosiderites as sensitive recorders of non‐marine …

Similar to the pyrite–siderite petrographic relationship, the siderite–calcite relationship suggests locally fluctuating and spatially variant conditions between calcite …

Arsenic-poor fluids promote strong As partitioning into pyrite

For instance, our results suggest that the replacement of siderite by pyrite through a coupled dissolution reprecipitation reaction may serve as an efficient process …

The microbially driven formation of siderite in salt …

The presence of hydrogen sulfide also precludes the formation of siderite because hydrogen sulfide reacts rapidly with dissolved iron to make iron monosulfide minerals and ultimately pyrite (Berner, …

Evidence from massive siderite beds for a CO

The abundance of large, massive siderite-rich beds in pre-1.8-Gyr sedimentary sequences and their carbon isotope ratios indicate that the atmospheric CO2 concentration was more than 100 times...