Archaean Geochemistry by B.F. Windley and S.M. Naqvi (Eds.)

By B.F. Windley and S.M. Naqvi (Eds.)

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300-350°C b l o c k i n g t e m p e r a t u r e (Hanson and Gast ) 1967), associated with u p l i f t . Hence t h e v a r i o u s l i n e s o f e v i d e n c e p o i n t t o t h e t y p e a r e a f o r t h e L a x f o r d i a n o r o g e n y , and a d j a c e n t r e g i o n s , h a v i n g been s u b j e c t e d t o i n t e n s e metamorphism d u r i n g e a r l y - m i d d l e P r o t e r o z o i c t i m e s . On t h e studies - from Rb-Sr m u s c o v i t e Lyon e t a l . , van Breemen e t a l .

F ; u b i d i m - s t r c the LZenc u . p l i 3 , Texas. J. I age of sene m e t a n c r 6: 29-56. This Page Intentionally Left Blank GEOCHRONOLOGY This Page Intentionally Left Blank 43 APPLICATION OF U-PB Z I R C O N AND OTHER ISOTOPZC STUDIES TO THE IDENTIFICATION OF ARCHAEAN ROCKS I N THERMALLY AND TECTONICALLY OVERPRINTED TERRANES: L E W I S I A N COMPLEX OF SCOTLAND D . R . Bowes Depariment o f G e o l o g y , U n i v e r s i t y o f Glasgow, Glasgow G 1 2 899, S c o t l a n d Abstract I s o t o p i c d a t a are u s e d t o i e s t i h e i n t e r p r e t a t i o n t h a t t h e g n e i s s e s and a s s o c i a i e d a m p h i b o l i t e f a c i e s r o c k s , which make up a l a r g e or p r o p o r t i o n of t h e L e w i s i a n complex, a r e I-he r e s u l t of ' r e w o r k i n g ' 'reaciivaiion' on a c r u s t a l s c a l e .

Wiley, New York, pp. 1-96. A. , 1967. An estimate of the composition of part of the Canadian shield in northwestern Ontario. Canad. J. , 4: 725-739. Rogers, J . J . W . , 1974. Problems concerning the evolution of the Precambrian shield of peninsular India. Bull. geophys. , 12: 10~-118. Rogers, J . J . W . , 1977. nua1evolution of sial throughout geologic time. In: C. Ponnamperuma (Editor), Chemical Evolution of the Early Precambrian. Academic Press, New York, pp. 27-39. i?. , 1972. cn of g e o s ) n c i i i i a l m a t e r i a l .

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