(Table 2) B/Ca, d11B, Mg/Ca and δ¹⁸O record for ODP Hole 130-806B samples ...

• Main Authors: Wara, Michael W, Delaney, Margaret Lois, Bullen, Thomas D, Ravelo, Ana Christina
• Format: Dataset
• Language: English
• Published: PANGAEA 2003
• Subjects: Sample code/label; Sample code/label 2; AGE; Age, minimum/young; Age, maximum/old; Globigerinoides sacculifer, Boron/Calcium ratio; Globigerinoides sacculifer, δ11B; Globigerinoides sacculifer, Magnesium/Calcium ratio; Globigerinoides sacculifer, weight; Globigerinoides sacculifer, δ18O; Drilling/drill rig; DSDP/ODP/IODP sample designation; Inductively coupled plasma - mass spectrometry ICP-MS; Negative-thermal ionization mass spectrometry N-TIMS; Weighted; Isotope ratio mass spectrometry; Leg130; Joides Resolution; Ocean Drilling Program ODP; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.841348; https://doi.pangaea.de/10.1594/PANGAEA.841348

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 (d11B) 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, ... : Sediment depth is given in mbsf. Measured on G. sacculifer (w/o sacc) size fraction 355-425 µm. Age assignments were made using the timescales of Berger et al. (1993) and Mayer et al. (1993). ...