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The boron isotope compositions (δ11B) of biogenic carbonates have proven to be an invaluable tool for investigating changes in ocean carbonate chemistry, especially the impacts of declining seawater pH due to rising levels of atmospheric CO2. Accurate, high precision boron isotopic measurements, however, remain analytically challenging with conventional approaches being extremely time consuming and labour intensive. Here we present a new analytical approach for high precision accurate measurements of boron isotope compositions in biogenic carbonates. We show that a laser ablation MC-ICPMS system equipped with 1013 Ω amplifiers provides a powerful tool for determining micro-scale δ11B values with an internal precision of ≤0.15‰ (2SD) and a total long-term accuracy of better than 0.22‰, which is equivalent to or better than those of conventional solution-based methods. This accuracy is …