Formation of Jasperoid and Anorthosite

Jasperoid

Anorthosite

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1 Formation

1.1 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.

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.

1.2 Composition

1.2.1 Mineral Content

Clay Minerals, Pyrite, Quartz, Sulfides

Amphibole, Clinopyroxene, Ilmenite, Magnetite, Olivine, Orthopyroxene

1.2.2 Compound Content

NaCl, CaO, Carbon Dioxide, Magnesium Carbonate, MgO

Ca, CaO, Chromium(III) Oxide, MgO, Sulfur Trioxide

1.3 Transformation

1.3.1 Metamorphism

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1.3.2 Types of Metamorphism

Burial Metamorphism, Cataclastic Metamorphism, Regional Metamorphism

Cataclastic Metamorphism, Contact Metamorphism

1.3.3 Weathering

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1.3.4 Types of Weathering

Not Applicable

Biological Weathering

1.3.5 Erosion

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1.3.6 Types of Erosion

Not Applicable

Chemical Erosion, Wind Erosion

Jasperoid and Anorthosite Formation

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