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Science 2 November 2007:
Vol. 318. no. 5851, p. 746
DOI: 10.1126/science.1144231
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Technical Comments

Response to Comments on "A Vestige of Earth's Oldest Ophiolite"

Harald Furnes,1* Maarten de Wit,2 Hubert Staudigel,3 Minik Rosing,4 Karlis Muehlenbachs5

The comments by Nutman and Friend, and Hamilton, question our evidence for the presence of the Isua ophiolite. Their critical remarks are particularly directed at the veracity of our inferred sheeted-dike complex, the cogenicity of pillow lavas and dikes, and the nonexistence of modern equivalents. Here, we expand on our explanations in response to each of their comments to better justify our arguments and interpretation.

1 Centre for Geobiology and Department of Earth Science, University of Bergen, Bergen, Norway.
2 AEON-Africa Earth Observatory Network, and Department of Geological Sciences, University of Cape Town, Rondebosch 7700, South Africa.
3 Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92093–0225, USA.
4 Nordic Centre for Earth Evolution (NordCEE), and Geological Museum, University of Copenhagen, 1350 København K, Denmark.
5 Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada.

* To whom correspondence should be addressed. E-mail: harald.furnes{at}geo.uib.no

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Science. ISSN 0036-8075 (print), 1095-9203 (online)