Subducted greywacke in the Olympic Mountains, USA-implications for the origin of Archaean sodic gneisses

Details Subducted greywacke in the Olympic Mountains, USA-implications for the origin of Archaean sodic gneisses Subducted greywacke in the Olympic Mountains, USA-implications for the origin of Archaean sodic gneisses

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975natur.258...60c&link_type=abstract

Nature, Volume 258, Issue 5530, pp. 60-61 (1975).

Physics

Scientific paper

IN Archaean greenstone belts the earliest granitic rocks are sodic or quartz dioritic gneisses and migmatites that surround and diapirically intrude the greenstones. The granitic rocks have been considered as the sialic basement on which the greenstones were deposited1,2 and as sialic underplatings of a primordial greenstone crust3-5. But the structural relationships between greenstones and greywackes in the Olympic Mountains of Washington State, USA, suggest that the Archaean gneisses may have formed by subduction of greywacke suites and associated volcanic rocks beneath nearly coeval oceanic crust.

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