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Formation of Anorthosite and Gabbro


Formation of Gabbro and Anorthosite


Formation

Formation
Anorthosite is a phaneritic, intrusive igneous rock which is characterized by a predominance of plagioclase feldspar which is almost 90–100%, and a minimal mafic component.   
Gabbro, a mafic rock, forms due to cooling and crystallization of magma underneath Earth's surface.   

Composition
  
  

Mineral Content
Amphibole, Clinopyroxene, Ilmenite, Magnetite, Olivine, Orthopyroxene   
Augite, Olivine, Plagioclase, Pyroxene   

Compound Content
Ca, CaO, Chromium(III) Oxide, MgO, Sulfur Trioxide   
Aluminium Oxide, CaO, Chromium(III) Oxide, Iron(III) Oxide, Potassium Oxide, MgO, Sodium Oxide, Silicon Dioxide, Sulfur Trioxide   

Transformation
  
  

Metamorphism
Yes   
Yes   

Types of Metamorphism
Cataclastic Metamorphism, Contact Metamorphism   
Impact Metamorphism   

Weathering
Yes   
Yes   

Types of Weathering
Biological Weathering   
Chemical Weathering   

Erosion
Yes   
Yes   

Types of Erosion
Chemical Erosion, Wind Erosion   
Coastal Erosion   

Properties >>
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Anorthosite and Gabbro Formation

Formation of rocks is a long process and hence, Anorthosite and Gabbro 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 Anorthosite and Gabbro, composition of Anorthosite and Gabbro and their transformation.

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