A Type Granites Geochemical Characteristics

Petrographic characteristics of the barabazar granite under cross nicol a granite with interlocking crystals and perthite t exture.

A type granites geochemical characteristics.

Example from peninsular malaysia granites azman a ghani department of geology university of malaya 50603 kuala lumpur abstract. Pdf on jan 1 1987 j b. A type granites are mostly peraluminous and many of them have metasedimentary sources that previously underwent significant extraction of hydrous felsic melts. 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.

Geochemical characteristics and discrimination find read and cite all the research you need on researchgate. There are lower levels of calcium and strontium. Geochemical and petrological data indicates that it is a type granite which formed in within plate granite tectonic set up. 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.

They are recognized by a specific set of mineralogical geochemical textural and isotopic characteristics. Geochemical characteristics of s and i type granites. The ratio of gallium to aluminium is high as is the ratio of iron to magnesium. 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. 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. S type granites are a category of granites first proposed by chappell white. 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.

Chemical characteristics of a type granites include high silica alkalis zirconium niobium gallium yttrium and cerium. Geochemical characteristics discrimination and petrogenesis. Petrographic features are representative of the chemical. Whalen and others published a type granites.

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. Y yb ta and nb similar to the typical continent continent syn collisional granite. By using ga al ratio fractionated felsic i or s type granites can overlap in apparent. Western central and eastern belts.

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.