A Vestige of Earth's Oldest Ophiolite-Reference-Cited by-同舟云学术

A Vestige of Earth's Oldest Ophiolite

Published:2007-03-23 Issue:5819 Volume:315 Page:1704-1707
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Furnes Harald¹²³⁴⁵,de Wit Maarten¹²³⁴⁵,Staudigel Hubert¹²³⁴⁵,Rosing Minik¹²³⁴⁵,Muehlenbachs Karlis¹²³⁴⁵

Affiliation:

1. Centre for Geobiology and Department of Earth Science, University of Bergen, Bergen, Norway.

2. Africa Earth Observatory Network (AEON) and Department of Geological Sciences, University of Cape Town, Rondebosch 7700 South Africa.

3. GeoForschungsZentrum (GFZ)–Potsdam, Telegraphenberg, Potsdam, Germany.

4. Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093-0225, USA.

5. Nordic Centre for Earth Evolution and Geological Museum, University of Copenhagen, 1350, Københagen K, Denmark

Abstract

A sheeted-dike complex within the ∼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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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