| Abstract: | We present the first continuous records from 0 to 5 Ma (in 0.333 m.y. integrated time steps) of paired boron/calcium (B/Ca) ratios and boron isotopes (??11B) in the planktonic foraminifera Globogerinoides sacculifer (without sacc) from a site in the western equatorial Pacific Ocean (Ocean Drilling Program Site 806). These measurements, the first made in conjunction with calcification temperature (magnesium/calcium ratios) and average shell mass measurements, indicate that pH is not the sole environmental variable controlling B in planktonic foraminiferal calcite. Our data are consistent with calcification temperature exerting a primary control on B concentration and isotopic composition in planktonic foraminifera. If so, calcification temperature must be taken into account if pH for past oceans and atmospheric pCO2 are to be estimated from B isotope measurements in foraminiferal calcite. Doing so will substantially increase the uncertainty of PH estimates. Although this work was designed as a temporal study, its results define new aspects of calibrating the ??11B paleo-pH tracer. Copyright 2003 by the American Geophysical Union. |
| Genre: | Article |
| ProdID: | 70024693 |
| Citation Author: | Wara, M. W.; Delaney, M. L.; Bullen, T. D.; Ravelo, A. C. |
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| Citation End Page: | 1 |
| Citation Issue: | 4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Paleoceanography |
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| Citation Number Of Pages: | -22 |
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| Citation Search Results Text: | Possible roles of pH, temperature, and partial dissolution in determining boron concentration and isotopic composition in planktonic foraminifera; 2003; Article; Journal; Paleoceanography; Wara, M. W.; Delaney, M. L.; Bullen, T. D.; Ravelo, A. C. |
| Citation Start Page: | 24 |
| Citation Volume: | 18 |
| Citation Year: | 2003 |
| Type: | citation/reference |
| Text: | Possible roles of pH, temperature, and partial dissolution in determining boron concentration and isotopic composition in planktonic foraminifera; 2003; Article; Journal; Paleoceanography; Wara, M. W.; Delaney, M. L.; Bullen, T. D.; Ravelo, A. C. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 2003 00:00 -0600 |
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