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Formation of Jasperoid and Chert


Formation of Chert and Jasperoid


Formation

Formation
Jasperoid is a rare and peculiar type of metasomatic alteration of rocks. It is formed by extreme alteration of wall rocks within a shear zone which may occur in sediments, andesites, trachytes and basalts.   
Chert forms when microcrystals of silicon dioxide grow within soft sediments that become limestone or chalk. The chert formation can be either of chemical or biological origin.   

Composition
  
  

Mineral Content
Clay Minerals, Pyrite, Quartz, Sulfides   
Quartz, Silicon   

Compound Content
NaCl, CaO, Carbon Dioxide, Magnesium Carbonate, MgO   
Silicon Dioxide   

Transformation
  
  

Metamorphism
Yes   
No   

Types of Metamorphism
Burial Metamorphism, Cataclastic Metamorphism, Regional Metamorphism   
Not Applicable   

Weathering
No   
No   

Types of Weathering
Not Applicable   
Not Applicable   

Erosion
No   
Yes   

Types of Erosion
Not Applicable   
Chemical Erosion   

Properties >>
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Jasperoid and Chert Formation

Formation of rocks is a long process and hence, Jasperoid and Chert 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 Jasperoid and Chert, composition of Jasperoid and Chert and their transformation.

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Fossil Rocks

Fossil Rocks

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