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Seawater Chemistry and Early Carbonate Biomineralization

Susannah M. PorterAuthors Info & Affiliations
Science
1 Jun 2007
Vol 316, Issue 5829
p. 1302
DOI: 10.1126/science.1137284
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Abstract

The first appearances of aragonite and calcite skeletons in 18 animal clades that independently evolved mineralization during the late Ediacaran through the Ordovician (~550 to 444 million years ago) correspond to intervals when seawater chemistry favored aragonite and calcite precipitation, respectively. Skeletal mineralogies rarely changed once skeletons evolved, despite subsequent changes in seawater chemistry. Thus, the selection of carbonate skeletal minerals appears to have been dictated by seawater chemistry at the time a clade first acquired its mineralized skeleton.

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This work benefited from discussions with S. Awramik, P. Baker, J. Boles, S. Carlson, J. Grotzinger, J. Kellogg, A. Knoll, T. Lowenstein, A. Maloof, J. Payne, J. Sorauf, F. Spera, M. Vendrasco, J. Weaver, S. Weiner, and B. Zempolich. Three anonymous reviewers offered helpful comments on earlier drafts. Supported by NASA grant no. EXB04-0000-0117.
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Published In

Science
Volume 316 | Issue 5829
1 June 2007

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American Association for the Advancement of Science.

Submission history

Received: 7 November 2006
Accepted: 27 February 2007
Published in print: 1 June 2007

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Notes

Supporting Online Material
www.sciencemag.org/cgi/content/full/316/5829/1302/DC1
SOM Text
Tables S1 and S2
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Authors

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Susannah M. Porter
Department of Earth Science, University of California at Santa Barbara, Santa Barbara, CA 93106, USA.
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  • Susannah M. Porter
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Seawater Chemistry and Early Carbonate Biomineralization.Science316,1302-1302(2007).DOI:10.1126/science.1137284

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