GEOLOGINEN TUTKIMUSLAITOS BU LLETI N OE LA COMMISSION GEOLOGIOUE OE FINLANOE N :o 181 ON THE CHARNOCKITES IN THE LIGHT OF A HIGHLY METAMORPHIC ROCK COMPLEX IN SOUTHWESTERN FINLAND BY KAU KO PARRAS W I T H 24 F I GUR E S, I 3 TA B L E SAN DON E M A P HELSINKI 1958