Boron isotope and B/Ca ratios of planktonic foraminifera ...

• Main Author: Foster, Gavin L
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2008
• Subjects: Drilling/drill rig; Kasten corer; Gravity corer Kiel type; Leg108; Leg130; Leg138; Leg154; Leg165; D184; M12/1; M37/1; Joides Resolution; Discovery 1962; Meteor 1986; Ocean Drilling Program ODP; Planktonic foraminifera
• Online Access: https://dx.doi.org/10.1594/pangaea.716666; https://doi.pangaea.de/10.1594/PANGAEA.716666

Here a new analytical methodology is described for measuring the isotopic composition of boron in foraminifera using multicollector inductively coupled plasma mass spectrometry (MC-ICPMS). This new approach is fast (~10 samples analysed in duplicate per analytical session) and accurate (to better than 0.25 per mil at 95% confidence) with acceptable sample size requirements (1-3 mg of carbonate). A core top calibration of several common planktic and two benthic species from geographically widespread localities shows a very close agreement between the isotopic composition measured by MC-ICPMS and the isotopic composition of B(OH)-4 in seawater (as predicted using the recently measured isotopic equilibrium factor of 1.0272) at the depth of habitat. A down core and core top investigation of boron concentration (B/Ca ratio) shows that the partition coefficient is influenced by [CO2-3] complicating the application of this proxy. Nevertheless, it is demonstrated that these two proxies can be used to fully constrain ... : Supplement to: Foster, Gavin L (2008): Seawater pH, pCO2 and [CO3 [2-] ] variations in the Caribbean Sea over the last 130 kyr: A boron isotope and B/Ca study of planktic foraminifera. Earth and Planetary Science Letters, 271(1-4), 254-266 ...