An extensional fault model for the early development of greenstone belts, with reference to a portion of the Abitibi belt, Ontario, Canada

Details An extensional fault model for the early development of greenstone belts, with reference to a portion of the Abitibi belt, Ontario, Canada An extensional fault model for the early development of greenstone belts, with reference to a portion of the Abitibi belt, Ontario, Canada

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..79..159g&link_type=abstract

Earth and Planetary Science Letters, Volume 79, Issue 1-2, p. 159-167.

Mathematics

Logic

5

Scientific paper

Detailed geological mapping of a small part of the Archaean Abitibi greenstone belt, northwestern Ontario, suggests that the mafic and ultra-mafic lavas were extruded in a submarine environment in which the volcanism was intimately associated with deformation of the growing volcanic pile. The deformation led to the subsidence and progressive tilting of the lavas and to the development of discontinuities. A review of selected areas of Quaternary volcanism suggests that subsidence of the lava pile during volcanism is not unusual and that activity is frequently also associated with normal faulting. In both volcanic and non-volcanic extensional regimes deformation is dominated by the development of listric faults. We argue that greenstone belts, such as the Abitibi, were formed in extensional regimes and we show that a simple geometric model involving fissure volcanism and synvolcanic rotation of the lavas on listric faults, accounts for the major primary features of greenstone belts and for some associated geophysical properties.

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