Formation of Chalk and Mudstone

Chalk

Mudstone

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1 Formation

1.1 Formation

Chalk is formed from lime mud, which accumulates on the sea floor which is then transformed into rock by geological processes.

Mudstone forms when very fine-grained clay particles are deposited in water which settle at the bottom of water bodies. They are buried and compacted by overlying sediment hence forming mudstone.

1.2 Composition

1.2.1 Mineral Content

Calcite, Clay, Clay Minerals, Quartz, Sand

Biotite, Chlorite, Feldspar, Micas, Muscovite or Illite, Plagioclase, Pyrite, Quartz

1.2.2 Compound Content

Ca, NaCl, CaO

Aluminium Oxide, NaCl, CaO, Iron(III) Oxide, Silicon Dioxide

1.3 Transformation

1.3.1 Metamorphism

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19% Sedimentary Rocks Rocks have it !

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19% Sedimentary Rocks Rocks have it !

1.3.2 Types of Metamorphism

Not Applicable

1.3.3 Weathering

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78% Sedimentary Rocks Rocks have it !

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78% Sedimentary Rocks Rocks have it !

1.3.4 Types of Weathering

Biological Weathering, Chemical Weathering

Chemical Weathering, Mechanical Weathering

1.3.5 Erosion

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86% Sedimentary Rocks Rocks have it !

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86% Sedimentary Rocks Rocks have it !

1.3.6 Types of Erosion

Chemical Erosion, Coastal Erosion, Water Erosion

Chemical Erosion, Sea Erosion

Chalk and Mudstone Formation

Formation of rocks is a long process and hence, Chalk and Mudstone formation sounds very interesting. According to the formation, all rocks are divided into :Igneous Rocks, Fossil Rocks and Metamorphic Rocks. Igneous rocks form by crystallization of magma or lava. The magma is made up of various components of pre-existing rocks which have been subjected to melting either at subduction zones or within the Earth's mantle. Igneous rocks are generally seen at mid ocean ridges or in intra-plate hotspots. Sedimentary rocks are formed when sediments accumulate gradually. As the sediments are buried they get compacted as more and more material is deposited on top. Eventually the sediments become so dense that they form a rock. Metamorphic rocks are rocks which once existed as igneous or sedimentary rocks but have been subjected to varying degrees of pressure and heat within the Earth's crust. Get to know all about formation of Chalk and Mudstone, composition of Chalk and Mudstone and their transformation.