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Biomarker Evidence for Photosynthesis During Neoproterozoic Glaciation

Olcott, Alison N. and Sessions, Alex L. and Corsetti, Frank A. and Kaufman, Alan J. and de Oliviera, Tolentino Flavio (2005) Biomarker Evidence for Photosynthesis During Neoproterozoic Glaciation. Science, 310 (5747). pp. 471-474. ISSN 0036-8075. doi:10.1126/science.1115769.

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Laterally extensive black shales were deposited on the São Francisco craton in southeastern Brazil during low-latitude Neoproterozoic glaciation ∼740 to 700 million years ago. These rocks contain up to 3.0 weight % organic carbon, which we interpret as representing the preserved record of abundant marine primary productivity from glacial times. Extractable biomarkers reflect a complex and productive microbial ecosystem, including both phototrophic bacteria and eukaryotes, living in a stratified ocean with thin or absent sea ice, oxic surface waters, and euxinic conditions within the photic zone. Such an environment provides important constraints for parts of the “Snowball Earth” hypothesis.

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Sessions, Alex L.0000-0001-6120-2763
Additional Information:© 2005 American Association for the Advancement of Science. Received for publication 6 June 2005. Accepted for publication 21 September 2005. We thank Companhia Mineira de Metais for samples, R. Summons and E. Grosjean for helpful discussion and metastable-reaction monitoring gas chromatography–mass spectroscopy (GC-MS) analyses; G. Love, A. Bradley, J. Brocks, C. Li, M. Eek, K. Nealson, and W. Berelson for helpful discussion; J. Pinho and K. B. Brody for help in Brazil; N. Geboy and C. France for TOC abundance data; G. McDonald for lab access; as well as two anonymous reviewers for comments. Supported by NSF grants EAR0418083 (F.C., A.S., A.O.) and EAR0126378 (A.J.K.) and NASA Exobiology grant 42000-62153 (F.C. and A.O.).
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Issue or Number:5747
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Official Citation:Biomarker Evidence for Photosynthesis During Neoproterozoic Glaciation Alison N. Olcott, Alex L. Sessions, Frank A. Corsetti, Alan J. Kaufman, and Tolentino Flavio de Oliviera Science 21 October 2005: 310 (5747), 471-474.Published online 29 September 2005 [DOI:10.1126/science.1115769]
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39102
Deposited By: Tony Diaz
Deposited On:26 Jun 2013 21:31
Last Modified:09 Nov 2021 23:42

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