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Metamorphism in the Agnew Lake Area, Sudbury District, Ontario, Canada



Metamorphism in the Agnew Lake Area, Sudbury District, Ontario, Canada



Geological Society of America Bulletin 75(10): 1011-1030



Mafic igneous, pelitic metasediments, and quartzo-feldspathic rocks were metamorphosed in the range from greenschist to lower almandine-amphibolite facies; chlorite-biotite, garnet, chloritoid, and staurolite zones are recognized. Changes in assemblages with grade are depicted by equations and petrographic diagrams, and assemblages are classified into subfacies. Fabric studies indicate three events--an early plastic deformation with development of low grade assemblages followed by a static environment and high grade phases, and finally a late brittle deformation with minor retrograde effects. Partitioning of various trace elements among coexisting phases is discussed. Pyrrhotite compositions suggest metamorphic temperatures of 400 degrees C-570 degrees C for the higher grade rocks, and a gradient of 75 degrees C-150 degrees C per km. Sources of thermal energy are considered. The age of the metamorphism was about 1,600 m.y. by radiometric dating.

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