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Rosing, Bird, Sleep & Bjerrum reply

Author

Listed:
  • Minik T. Rosing

    (Nordic Center for Earth Evolution
    Stanford University
    Natural History Museum of Denmark, University of Copenhagen)

  • Dennis K. Bird

    (Nordic Center for Earth Evolution
    Stanford University)

  • Norman H. Sleep

    (Stanford University)

  • Christian J. Bjerrum

    (Nordic Center for Earth Evolution
    Department of Geography and Geology University of Copenhagen)

Abstract

Replying to C. T. Reinhard & N. J. Planavsky Nature 474, doi:10.1038/nature09959 (2011) ; N. Dauphas & J. F. Kasting Nature 474 doi:10.1038/nature09960 (2011) ; C. Goldblatt & K. Zahnle Nature 474 doi:10.1038/nature09961 (2011) Reinhard and Planavsky 1 and Dauphas and Kasting 2 question whether the formation of Fe2+/Fe3+-rich sediments and the preservation of magnetite in banded iron formations (BIFs) constrains atmospheric . Goldblatt and Zahnle 3 question whether reduced albedo in combination with a slightly increased greenhouse effect could compensate for the reduced luminosity of the faint young Sun. Reinhard and Planavsky1 and Dauphas and Kasting2 suggest that BIF mineralogy is solely controlled by diagenetic and metamorphic processes decoupled from ocean–atmosphere chemistry. We focus on the persistent preservation of magnetite in all Archean BIFs, and of magnetite and siderite in many BIFs4, and estimate the partial pressure of CO2 during the Archean ( ) using the least number of assumptions concerning unconstrained parameters. Our conclusions5 are not undermined by any geochemical data that support high .

Suggested Citation

  • Minik T. Rosing & Dennis K. Bird & Norman H. Sleep & Christian J. Bjerrum, 2011. "Rosing, Bird, Sleep & Bjerrum reply," Nature, Nature, vol. 474(7349), pages 1-1, June.
    • Handle: RePEc:nat:nature:v:474:y:2011:i:7349:d:10.1038_nature09962
    DOI: 10.1038/nature09962
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