| Abstract: | Major ion compositions of primary fluid inclusions from terminal Proterozoic (ca. 544 Ma) and Early Cambrian (ca. 515 Ma) marine halites indicate that seawater Ca2+ concentrations increased approximately threefold during the Early Cambrian. The timing of this shift in seawater chemistry broadly coincides with the "Cambrian explosion," a brief drop in marine 87Sr/86Sr values, and an increase in tectonic activity, suggesting a link between the advent of biocalcification, hydrothermal mid-ocean-ridge brine production, and the composition of seawater. The Early Cambrian surge in oceanic [Ca2+] was likely the first such increase following the rise of metazoans and may have spurred evolutionary changes in marine biota. ?? 2004 Geological Society of America. |
| Genre: | Article |
| ProdID: | 70026972 |
| Citation Author: | Brennan, S. T.; Lowenstein, T. K.; Horita, J. |
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| Citation End Page: | 476 |
| Citation Issue: | 6 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geology |
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| Citation Number Of Pages: | 4 |
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| Citation Search Results Text: | Seawater chemistry and the advent of biocalcification; 2004; Article; Journal; Geology; Brennan, S. T.; Lowenstein, T. K.; Horita, J. |
| Citation Start Page: | 473 |
| Citation Volume: | 32 |
| Citation Year: | 2004 |
| Type: | citation/reference |
| Text: | Seawater chemistry and the advent of biocalcification; 2004; Article; Journal; Geology; Brennan, S. T.; Lowenstein, T. K.; Horita, J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1130/G20251.1 |
| Date Other: | Thu, 1 Jan 2004 00:00 -0600 |
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