Parallel evolution of Archaean low- and high-grade terrane: A view based on relationships between the Abitibi, Wawa and Kapuskasing belts

作者: John A. Percival , Kenneth Coe

DOI: 10.1016/0301-9268(81)90043-7

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摘要: Abstract The Kapuskasing structural zone (KSZ) is a region of high-grade Archaean gneiss transverse to the regional east—west trends adjacent lower-grade Abitibi, Wawa and Quetico belts. made up granulite amphibolite facies paragneiss, tonalitic anorthosite-suite gneiss, whereas regions are metavolcanic—metasedimentary belts, with gneissic plutonic components. Foliations in KSZ strike northeast dip moderately northwest. To account for development contrasting lithological, metamorphic characteristics areas, unique history postulated KSZ. Psammitic sedimentary rocks, possibly deposited fault-bounded basin, were intruded by anorthosite which may have had its erruptive equivalents tholeiitic volcanic rocks Abitibi belt. During Kenoran orogeny was metamorphosed at infrastructural levels while low-grade outside underwent sub-greenschist metamorphism higher levels. Late ductile shear reoriented elements into directions. Proterozoic fault movements juxtaposed low regions.

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