Science. 2007 Mar 23;315(5819):1704-7.

A vestige of Earth's oldest ophiolite.

Furnes H, de Wit M, Staudigel H, Rosing M, Muehlenbachs K.

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Centre for Geobiology and Department of Earth Science, University of Bergen, Bergen, Norway. harald.furnes@geo.uib.no

Abstract

A sheeted-dike complex within the approximately 3.8-billion-year-old Isua supracrustal belt (ISB) in southwest Greenland provides the oldest evidence of oceanic crustal accretion by spreading. The geochemistry of the dikes and associated pillow lavas demonstrates an intraoceanic island arc and mid-ocean ridge-like setting, and their oxygen isotopes suggest a hydrothermal ocean-floor-type metamorphism. The pillows and dikes are associated with gabbroic and ultramafic rocks that together make up an ophiolitic association: the Paleoarchean Isua ophiolite complex. These sheeted dikes offer evidence for remnants of oceanic crust formed by sea-floor spreading of the earliest intact rocks on Earth.

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Comment on "A vestige of Earth's oldest ophiolite". [Science. 2007]
Comment on "A vestige of Earth's oldest ophiolite".
Hamilton WB. Science. 2007 Nov 2; 318(5851):746; author reply 746.
Comment on "A vestige of Earth's oldest ophiolite". [Science. 2007]
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