Accumulation of carbonates

Weathering

Carbonates can be formed as a result of the weathering of calcium-bearing minerals such as:

By alteration of the feldspars

In these two images of alteration of plagioclase to carbonates in granitic rocks:

By alteration of the gypsum

In these two microscopic fields it is shown how the alteration of the gypsum produces carbonates in some gypsum marls:

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