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采用正热电离质谱方法测定了中国南海诸岛7000a以来的珊瑚礁的硼同位素组成和硼含量。讨论了珊瑚礁中硼同位素组成与硼含量、pH值、生成年代等参数的关系。结果表明，所测定的珊瑚礁硼同位素组成变化范围为22.7‰～24．8‰，并且与珊瑚礁的硼含量呈正相关关系。根据硼同位素与海水pH值的关系计算出过去7000a南海海水的pH值变化范围为8．10～8.41。初步探讨了硼同位素组成与南海海平面变化的关系。
The boron isotopic composition and boron content of coral reefs in the South China Sea islands since 7000a were determined by using the method of positive thermal ionization mass spectrometry. The relationship between boron isotopic composition and boron content, pH value, age of formation and other parameters in coral reefs are discussed. The results show that the measured boron isotopic composition of coral reefs ranges from 22.7 ‰ to 24.8 ‰ and has a positive correlation with the boron content of coral reefs. According to the relationship between boron isotope and seawater pH value, the pH value of seawater in the past 7000 years was calculated to be 8.10 ~ 8.41. The relationship between boron isotopic composition and sea level change in the South China Sea was discussed.