| Abstract: | Multiple lines of evidence have shown that the isotopic composition and concentration of calcium in seawater have changed over the past 28 million years. A high-resolution, continuous seawater calcium isotope ratio curve from marine (pelagic) barite reveals distinct features in the evolution of the seawater calcium isotopic ratio suggesting changes in seawater calcium concentrations. The most pronounced increase in the ??44/40Ca value of seawater (of 0.3 per mil) occurred over roughly 4 million years following a period of low values around 13 million years ago. The major change in marine calcium corresponds to a climatic transition and global change in the carbon cycle and suggests a reorganization of the global biogeochemical system. |
| Genre: | Article |
| ProdID: | 70032848 |
| Citation Author: | Griffith, E. M.; Paytan, A.; Caldeira, K.; Bullen, T. D.; Thomas, E. |
| Citation Contributing Office: | |
| Citation Datum: | |
| Citation Day: | |
| Citation Edition: | |
| Citation Editor: | |
| Citation End Page: | 1674 |
| Citation Issue: | 5908 |
| Citation Keywords: | |
| Citation Language: | English |
| Citation Larger Work Title: | Science |
| Citation LatN: | |
| Citation LatS: | |
| Citation LonE: | |
| Citation LonW: | |
| Citation Month: | |
| Citation No Pagination: | |
| Citation Number Of Pages: | 4 |
| Citation Online Only Flag: | |
| Citation Phsyical Description: | |
| Citation Projection: | |
| Citation Public Comments: | |
| Citation Publisher: | |
| Citation Series: | |
| Citation Series Code: | |
| Citation Series Number: | |
| Citation Search Results Text: | A dynamic marine calcium cycle during the past 28 million years; 2008; Article; Journal; Science; Griffith, E. M.; Paytan, A.; Caldeira, K.; Bullen, T. D.; Thomas, E. |
| Citation Start Page: | 1671 |
| Citation Volume: | 322 |
| Citation Year: | 2008 |
| Type: | citation/reference |
| Text: | A dynamic marine calcium cycle during the past 28 million years; 2008; Article; Journal; Science; Griffith, E. M.; Paytan, A.; Caldeira, K.; Bullen, T. D.; Thomas, E. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1126/science.1163614 |
| Date Other: | Tue, 1 Jan 2008 00:00 -0600 |
| Publisher: | |
