Carbonate Rock

Definition - What does Carbonate Rock mean?

A Carbonate Rock is a class of sedimentary rocks which are clastic in nature and formed by the precipitation process, i.e., in-situ from the skeletal remains of the marine animals or by the precipitation of carbonate material. In general carbonate rocks are either limestone or dolomite consisting mostly of calcium carbonate or magnesium carbonate. An example of metamorphic carbonate rock is marble.

Petropedia explains Carbonate Rock

Carbonate rocks are usually precipitated or dissolved by groundwater and contain oxocarbon anions which consist of three oxygen atoms surrounding one carbon atom in a trigonal planar arrangement. Some classes of sedimentary rocks consist of such carbon and oxygen molecules arrangement which is why they are referred to as carbonates. In such carbonate type sedimentary rocks, the primary constituents are calcite, dolomite [CaMg(CO3)2] and aragonite CaCO3, which are approximately 95% or more by weight. When carbonate rocks are dissolved by groundwater, large solution openings known as carbonate-rock aquifers are created. The most common types of carbonate sedimentary rocks are limestone, dolomite or dolostone and chalk.

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