A Type Granites Geochemical Characteristics

Pdf on jan 1 1987 j b.

A type granites geochemical characteristics. S type granites are a category of granites first proposed by chappell white. Hf and nd isotopes. 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. There are lower levels of calcium and strontium.

Petrographic characteristics of the barabazar granite under cross nicol a granite with interlocking crystals and perthite t exture. 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. Geochemical characteristics and discrimination find read and cite all the research you need on researchgate. 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.

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 sio 2 na 2 o k 2 o fe mg ga al zr nb ga y and ce and low cao and sr. Petrographic features are representative of the chemical. The peninsular malaysian granites are distributed into three parallel belts i e.

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. Y yb ta and nb similar to the typical continent continent syn collisional granite. The ratio of gallium to aluminium is high as is the ratio of iron to magnesium. 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. Geochemical and petrological data indicates that it is a type granite which formed in within plate granite tectonic set up. Whalen and others published a type granites. By using ga al ratio fractionated felsic i or s type granites can overlap in apparent.

Example from peninsular malaysia granites azman a ghani department of geology university of malaya 50603 kuala lumpur abstract. A type granites are mostly peraluminous and many of them have metasedimentary sources that previously underwent significant extraction of hydrous felsic melts. Western central and eastern belts. They are recognized by a specific set of mineralogical geochemical textural and isotopic characteristics.

Chemical characteristics of a type granites include high silica alkalis zirconium niobium gallium yttrium and cerium.