Abstract
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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CHENEY, E., STEWART, R. Subducted greywacke in the Olympic Mountains, USA—implications for the origin of Archaean sodic gneisses. Nature 258, 60–61 (1975). https://doi.org/10.1038/258060a0
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DOI: https://doi.org/10.1038/258060a0
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