Carbonate rocks
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Carbonate rocks. Carbonate rocks are composed of two minerals Calcite CaCO 3 Dolomite Ca Mg (CO 3 ). The principal constituents of limestones are 1. Allochemical components (ooids, bioclasts, peloids and intraclasts)

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Carbonate rocks

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Carbonate rocks

Carbonate rocks are composed of two minerals

Calcite CaCO3

Dolomite Ca Mg (CO3 )

The principal constituents of limestones are

1. Allochemical components (ooids, bioclasts, peloids and intraclasts)

2. Micrite (microcrystalline calcite: refers to a crystal size less than 5 um)

3. Sparite (sparry calcite; refers to crystals of 5 um or more in diameter)

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Dunham classification of limestone

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Carbonate rocksOoid Grainstone

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Carbonate rocksOoid Packstone

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Carbonate rocksBioclast Packstone

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Carbonate rocksBioclast Wackstone

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Carbonate rocksIntraclast Grainstone

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Carbonate rocksPeloid Grainstone

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Carbonate rocksCarbonate Mudstone

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Carbonate rocksDolomitic limestone(The original sediment is a peloidal packstone)

The matrix have been replaced by dolomite, showing its characteristic euhedral rhombic shape

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Carbonate rocksDolomitic limeatone

A limestone section which has been treated with Alizarine Red S. Calcite showing shades of pink, red, and brown. The dolomite is colorless to grey and appears to be replacing matrix and/or cement.

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Carbonate rocksDolomite rock or dolostone

Dolomitic carbonate are classified according to their dolomite content:

dolomite

0-10% Limestone

10-50% dolomitic limestone

50-90% calcitic dolomite

90-100% dolomite

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Carbonate rocks

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