Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Science 13 January 2006:
Vol. 311. no. 5758, p. 177
DOI: 10.1126/science.1118420
Prev | Table of Contents | Next

Technical Comments

Response to Comment on "Iron Isotope Constraints on the Archean and Paleoproterozoic Ocean Redox State"

Olivier J. Rouxel

Andrey Bekker

Katrina J. Edwards

We reported a secular trend in iron isotope values of Precambrian sedimentary pyrite and related it to the changing redox state of Precambrian oceans. We restate that the iron cycle before 1.8 billion years ago was different from that now and reflected the rise of atmospheric oxygen and the subsequent moderate atmospheric oxygen level in the Paleoproterozoic.

Marine Chemistry and Geochemistry Department,
Woods Hole Oceanographic Institution,
Woods Hole, MA 02543, USA.

Geophysical Laboratory, Carnegie
Institution of Washington, 5251 Broad Branch Road,
NW, Washington, DC 20015, USA.

Geomicrobiology
Group, Woods Hole Oceanographic Institution,
Woods Hole, MA 02543, USA.

To whom correspondence should be addressed. E-mail: orouxel{at}whoi.edu

Read the Full Text

To Advertise     Find Products

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