Formation of Chert and Chalk

Chert

Chalk

Add ⊕

1 Formation

1.1 Formation

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.

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

Quartz, Silicon

Calcite, Clay, Clay Minerals, Quartz, Sand

1.2.2 Compound Content

Silicon Dioxide

Ca, NaCl, CaO

1.3 Transformation

1.3.1 Metamorphism

✔ ✘

1.3.2 Types of Metamorphism

Not Applicable

1.3.3 Weathering

✔ ✘

1.3.4 Types of Weathering

Not Applicable

Biological Weathering, Chemical Weathering

1.3.5 Erosion

✔ ✘

1.3.6 Types of Erosion

Chemical Erosion

Chemical Erosion, Coastal Erosion, Water Erosion

Chert and Chalk Formation

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