: Paléoclimatologie: carbonate ion

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carbonate ion

The carbonate ion is the polyatomic ion with the chemical formula CO32-. In chemistry, a carbonate is a salt combining this anion with one or more cations. In mineralogy, carbonates are minerals whose chemical composition is that of a carbonate: aragonite and calcite CaCO3, dolomite CaMg(CO3)2, etc. On Earth, in the long term, carbonates play a major role in the feedback of climate and greenhouse gases via the carbon cycle. They constitute (in the Earth's mantle, after sedimentation in the oceans and especially in the form of calcium carbonate) the main ('sustainable') carbon sinks. Some examples of carbonates: silver carbonate : Ag2CO3 barium carbonate: BaCO3 manganese carbonate: MnCO3. (Adapted and translated from: https://fr.wikipedia.org/wiki/Carbonate)

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