海相碳酸盐硼同位素反演古海水pH值模型及其应用

doi:10.11743/ogg20250321

Abstract

Abstract:

Boron （B） is widely distributed in nature. The fractionation of its stable isotopes ¹⁰B and ¹¹B establishes boron as a significant tool for reconstructing paleoceanographic and paleoclimate conditions. The sensitivity of the δ¹¹B values to seawater pH makes it possible to establish a δ¹¹B-paleo-seawater pH proxy. This proxy enables the inversion of paleo-seawater pH using the boron isotope values of marine carbonate minerals， which in turn facilitates the analysis of the atmospheric CO₂ concentration changes. Although the δ¹¹B-paleo-seawater pH proxy has great theoretical potential， its accuracy remains a challenge. By analyzing the boron cycling in the ocean and methods for boron isotope determination， we investigate the underlying mechanisms and application potential of the δ¹¹B-paleo-seawater pH proxy. The results indicate that major factors affecting the proxy accuracy include boron deviation caused by biological effects and inaccuracies in the fractionation coefficient between boron isotopes， insufficient understanding of the exchange processes between B（OH）₃ and $B (O H) 4 -$ in the seawater， and the inability of lab simulations to fully replicate the fractionation of boron isotopes during carbonate precipitation in the natural environment. To enhance the accuracy of the proxy， it is recommended to incorporate additional proxies such as the B/Ca ratio and to select carbonate samples less affected by biological effects. Furthermore， it is necessary to enhance the precision of boron isotope fractionation coefficient calculations， establishing a more scientific empirical method for correcting the biological effects. These advancements will contribute to more scientific and broader applications of boron isotopes in reconstructing paleoceanographic and paleoclimate conditions.

Key words: paleo-environment, paleoclimate, paleo-seawater, pH, boron isotope, marine carbonate

CLC Number:

TE135

Rui WANG, Chuntong LIU, Songye WU, Hui HUA. Proxy of paleo-seawater pH reconstruction based on boron isotopes of marine carbonates and its applications[J]. Oil & Gas Geology, 2025, 46(3): 1006-1018.

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方法	分馏系数（α_4-3）	特点	参考文献
分子轨道理论法	0.965 0 ~ 0.980 0	从微观角度深入理解，精确度高，但计算量大，成本高，对于参数的选择依赖性强	［96］
水滴法	0.974 0	可准确模拟分子的不同溶液环境下的实际情况，但计算成本高，且可能不适用于复杂环境体系	［103］
分光光度法	0.972 0	可直接测量，适合实际水样的分析计算，但对实验条件精确度要求高	［104］
活体珊瑚测定法	0.978 8	对自然样品的硼同位素理解深入，但成本高，样品需求量大，且易受样品的选择和处理过程影响	［39］

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Proxy of paleo-seawater pH reconstruction based on boron isotopes of marine carbonates and its applications

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