S And I Type Granites
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Although the isotopic compositions lie close to a mixing curve it is thought that the amount of mixing in the source rocks was restricted and occurred prior to partial melting.
S and i type granites. They can form autochthonous bodies and may be surrounded by gneisses and crystalline schists very. Amphibole and pyroxene are more common in i type granitoids while s type granitoids may have garnet cordierite and sillimanite. S type granites crystallizes from the viscous relatively water saturated magma at great depths. S type granites are over saturated in aluminium with an asi index greater than 1 1 where asi al 2 o 3 cao na 2 o k 2 o in mol percent.
Detailed studies in the berridale batholith compston shirahase chappell white in preparation have shown that strontium is more radiogenic in s type granites initial. These result in i type granitoids derived from igneous protoliths and containing moderate amounts of al 2 o 3 and high amounts of na 2 o and s type granitoids derived from sedimentary protoliths and containing high amounts of al 2 o 3 and relatively low amounts of na 2 o. Both types of granitoids may also contain biotite. Although the isotopic compositions lie close to a mixing curve it is thought that the amount of mixing in the source rocks was restricted and occurred prior to partial melting.
Amphibole and pyroxene are more common in i type granitoids. Petrographic features are representative of the chemical. S type granites and the converse in i types. I type granites are a category of granites originating from igneous sources first proposed by chappell and white 1974.
Garnet is a very common accessory mineral in this type. S type granites have higher δ 18 o values and more evolved sr and nd isotopic compositions although the radiogenic isotope compositions overlap with i types. S type granites have higher δ 18 o values and more evolved sr and nd isotopic compositions although the radiogenic isotope compositions overlap with i types. Other articles where s type granite is discussed.
Tectonic setting is arc collision. S type granite this type is of sedimentary origin paraorigin from anatexis of sedimentary rocks with high al2o3 and low sio2 content ex. Apatite inclusions are common in biotite and hornblende of i type granites whereas it occurs in larger discrete crystals in s types. Magma type is usually peraluminous magma al2o3 na2o k2o cao.
They are recognized by a specific set of mineralogical geochemical textural and isotopic characteristics that indicate for example magma hybridization in the deep crust i type granites are saturated in silica but undersaturated in aluminum. Petrographic features are. High amounts of na2o and s type granitoids derived from sedimentary protoliths and containing high amounts of al2o3 and relatively low amounts of na2o.
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