Formation of Variolite and Chalk

Variolite

Chalk

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Formation

Mineral Content

Compound Content

Metamorphism

Types of Metamorphism

Weathering

Types of Weathering

Erosion

Types of Erosion

Variolites are a group of dark green basic igneous rocks that exhibit pale colored spots on weathered surfaces that give them a pockmarked appearance.

Olivine, Plagioclase, Pyroxene

Aluminium Oxide, CaO, Iron(III) Oxide, FeO, Potassium Oxide, MgO, MnO, Sodium Oxide, Phosphorus Pentoxide, Silicon Dioxide, Titanium Dioxide

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Burial Metamorphism, Cataclastic Metamorphism, Contact Metamorphism, Hydrothermal Metamorphism, Impact Metamorphism, Regional Metamorphism

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Biological Weathering, Chemical Weathering, Mechanical Weathering

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

Calcite, Clay, Clay Minerals, Quartz, Sand

Ca, NaCl, CaO

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Biological Weathering, Chemical Weathering

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Chemical Erosion, Coastal Erosion, Water Erosion

Variolite and Chalk Formation

Formation of rocks is a long process and hence, Variolite and Chalk formation sounds very interesting. According to the formation, all rocks are divided into :Igneous Rocks, Sedimentary 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 Variolite and Chalk, composition of Variolite and Chalk and their transformation.