Peraluminous I Type Granites

It has previously been suggested that this may result from the fractional crystallisation of amphibole however data from. I type granites are rich in silica calcium and sodium but contain lesser amounts of aluminium and potassium when compared to s type granites. By comparing the whole rock geochemistry of typical i t ype and s type granites from lachlan fold belt lfb in southeast.

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Peraluminous Granite With Garnet Phenocrysts Granites That Contain Lots Of Aluminum May Have A Sedimentary Protolith Clay Minerals Granite Sedimentary Rocks

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Nevertheless the k rb of the most fractionated g4 and g2 leucogranites 70 and 123.

Peraluminous i type granites.

Peraluminous i type granites in the lachlan fold belt i type granites are exposed over an area 30 000 km 2 in the palaeozoic lachlan fold belt lfb and comprise almost half the total area of granites being slightly less abundant than s type granites fig. The peraluminous a type granites consist of four plutons namely wengshan caijiang gaoxi and fucheng for which comprehensive geochronological and geochemical data are available tables 1 and s1 in supplementary. It has previously been suggested that this may result from the fractional crystallisation of amphibole. I type peraluminous granites in the spanish central system 143 of aqueous uids e g shearer et al 1985.

Many i type granites are also peraluminous despite i type source rocks typically not being saturated in al. It has previously been suggested that this may result from the fractional crystallisation of amphibole. Many i type granites are also peraluminous despite i type source rocks typically not being saturated in al. As mentioned above herein we suggest that the high k calc alkaline peraluminous i type granites from gaoligong belt were derived from partial melting of the heterogenous source rocks in the lower crust with possible involvement.

I type granites are typically metaluminous to weakly peraluminous. The peraluminous i type granites resulted from a low pressure partial melting process and the peraluminous a type granites were derived from a charnockite source heated by large scale magmatic. Many i type granites are also peraluminous despite i type source rocks typically not being saturated in al. Two mica granites are two common rock types of peraluminous granites.

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