Formation of Argillite and Chalk

Argillite

Chalk

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1 Formation

1.1 Formation

An argillite is a fine-grained sedimentary rock mainly composed of clay particles which forms from lithified muds which contain variable amounts of silt-sized particles.

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

1.2 Composition

1.2.1 Mineral Content

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

Calcite, Clay, Clay Minerals, Quartz, Sand

1.2.2 Compound Content

Iron(III) Oxide, Potassium Oxide, MgO, Silicon Dioxide

Ca, NaCl, CaO

1.3 Transformation

1.3.1 Metamorphism

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1.3.2 Types of Metamorphism

Not Applicable

1.3.3 Weathering

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1.3.4 Types of Weathering

Biological Weathering

Biological Weathering, Chemical Weathering

1.3.5 Erosion

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1.3.6 Types of Erosion

Chemical Erosion

Chemical Erosion, Coastal Erosion, Water Erosion

Argillite and Chalk Formation

Formation of rocks is a long process and hence, Argillite and Chalk 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 Argillite and Chalk, composition of Argillite and Chalk and their transformation.