Abstract
It has been generally received that the granites having relatively high initial strontium composition (initial Sr87/Sr86) were formed either by remelting of sialic crustal rocks or by contamination of crystal materials in magmas of mantle-type materials origin. However, it seems to be necessary to reexamine such an idea. In the present paper the writer proposes a model for deriving granites having high initial strontium composition, without the participation of sialic crystral materials. In this model it is conceived that magmas generated from the upper mantle materials with low Rb/Sr and low Sr87/Sr86 values are brought to a halt there or nearby deep place for such a long time as 107yrs. or longer, and then are invaded into the crust and are differentiated into various granites. It is hoped that the validity of the above conception may be examined by further studies.
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