Boron Proxies in Paleoceanography and Paleoclimatology

Preface vii Acknowledgments viii About the Companion Website ix 1 Introduction and Concepts 1 1.1 Why Are we Interested in Reconstructing Marine Carbonate Chemistry? 1 Acknowledgments 8 References 8 Further Reading/Resources 12 2 Boron Systematics 13 2.1 Introduction 14 2.2 What Determines the Sensitivity of δ11B and B/Ca to Marine Carbonate Chemistry? 15 2.3 Boron Proxy Systematics in Synthetic Carbonates 21 2.4 Boron Isotopes in Biogenic Marine Carbonates 42 2.5 Secular Evolution of [BT] and δ11B in Seawater 81 2.6 The B/Ca Proxy in Foraminifera 88 References 105 3 Reconstructing Paleo‐Acidity, pCO2 and Deep‐Ocean [CO32–] 120 3.1 Introduction 120 3.2 Estimating Paleoseawater pH from Boron Isotopes 122 3.3 Estimating Marine Carbonate Chemistry from B/Ca Ratios 150 3.4 Guidelines for Selecting Sediment Core Sites and Sample Sizes 155 References 156 4 Boron Concentration and Isotope Ratio Analysis 165 4.1 Introduction 165 4.2 Inter‐Laboratory Comparison Studies 170 4.3 Standard Reference Materials and Data Quality Assurance 172 4.4 Boron Concentration and Isotope Ratio Analysis 175 4.5 Sample Preparation and Cleaning 179 4.6 Boron Separation and Purification 183 4.7 Instrumental Techniques 188 4.8 Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS) 201 4.9 Secondary Ion Mass Spectrometry (SIMS) 204 4.10 Other Techniques 206 4.11 Outlook and Future Directions 210 References 211 Index 224