【摘要】 采用热电离质谱（TIMS）对中国南海珊瑚硼同位素进行了测定,结果表明珊瑚δ¹¹B的变化范围为22.2‰²5.5‰,珊瑚的δ¹¹B与硼浓度呈现正相关。在讨论珊瑚δ¹¹B与海水pH值、珊瑚硼浓度与年龄之间关系的基础上,重点讨论了极地冰雪融化对珊瑚礁硼同位素组成变化的可能影响,即,由于全球变暖导致的冰雪融化对海水pH值减小、海面上升的贡献。研究者认为:中国南海珊瑚硼同位素低值与6000年前高海平面相对应,具有低碱度的冰雪融水是海水pH值减小的因素之一,由于全球变暖导致的冰雪融化的贡献有可能是海水pH值和珊瑚硼同位素变化的一个重要影响因素。据此,提出南海珊瑚硼同位素组成有可能成为反映中国南海海平面变化的一个代用指标。更多还原

【Abstract】 Boron isotopic compositions and concentrations in corals from the South China Sea have been investigated by using thermal ionization mass spectrometry.The results show that the boron isotopic compositions(¹¹ B) of corals vary in a range from 22.2%o to 25.5‰,having a positive relation with boron concentrations.The relations among δ¹¹ B,pH values,boron concentrations and age have been observed and discussed.In addition,another factor was discussed that the contributions of melt water derived from global warming reduced seawater pH as well as raised the sea level.The results show that the low δ¹¹ B value of corals in South China Sea is consistent with high sea level at about 6000 years before present.A contribution of melting ice associated with global warming should be considered as a factor for variation of pH and δ¹¹ B.更多还原