Recently, much attention has been paid to the
origin of andesites of the calc - a l k a l i n es e r i e s ,w h i c h
arewidelydistributedintimeandspaceinisland Takahashi,1978,1980;Zashueta.,1980;Tanaka arcsandcontinentalmargins.Severalnewhypothe-
seshavebeenproposedon thebasisofthe resultsof
experimentalpetrology and geochemistry