A Type Granites Geochemical Characteristics

By using ga al ratio fractionated felsic i or s type granites can overlap in apparent.

A type granites geochemical characteristics.

Petrographic characteristics of the barabazar granite under cross nicol a granite with interlocking crystals and perthite t exture. Geochemical and petrological data indicates that it is a type granite which formed in within plate granite tectonic set up. A type granites are mostly peraluminous and many of them have metasedimentary sources that previously underwent significant extraction of hydrous felsic melts. Pdf on jan 1 1987 j b.

The barabazar granite was emplaced at. On the basis of the major trace element characteristics the initial nd isotope compositions and relict zircon u pb ages of the triassic granites and their spatial overlap with the. Geochemical characteristics of s and i type granites. Hf and nd isotopes.

Good discrimination can be obtained between a type granites and most orogenic granites m i and s types on plots employing ga al various major element ratios and y ce nb and zr. Chemical characteristics of a type granites include high silica alkalis zirconium niobium gallium yttrium and cerium. The sarudik a type granites are further assigned. Example from peninsular malaysia granites azman a ghani department of geology university of malaya 50603 kuala lumpur abstract.

New analyses of 131 samples of a type alkaline or anorogenic granites substantiate previously recognized chemical features namely high sio 2 na 2 o k 2 o fe mg ga al zr nb ga y and ce and low cao and sr. Y yb ta and nb similar to the typical continent continent syn collisional granite. Western central and eastern belts. Geochemical characteristics discrimination and petrogenesis.

They are recognized by a specific set of mineralogical geochemical textural and isotopic characteristics. Whalen and others published a type granites. Good discrimination can be obtained between a type granites and most orogenic granites m i and s types on plots employing ga al various major element ratios and y ce nb and zr. New analyses of 131 samples of a type alkaline or anorogenic granites substantiate previously recognized chemical features namely high sio2 na2o k2o fe mg ga al zr nb ga y and ce and low cao and sr.

The peninsular malaysian granites are distributed into three parallel belts i e. S type granites are a category of granites first proposed by chappell white. The ratio of gallium to aluminium is high as is the ratio of iron to magnesium. Geochemical and isotopic data suggest that the source of these a type granites is the mesoproterozoic continental crust without significant incorporation of mantle derived component and their formation is controlled by subsequent fractional crystallization.

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