STUDY OF INFLUENCE FACTORS ON δ¹¹B-PH TECHNIQUE FOR MARINE BIO-CARBONATE DEPOSITS

Since 1990's,it has become a hotspot to use the δ¹¹B-pH technique to reconstruct the pH of seawater through δ¹¹B in marine biogenetic carbonates.Although plenty of papers have been devoted to this topic,there are still a lot of technical problems due to the incompletion in theory, that constrain the further application of the method. We discussed in this paper some uncertain factors of the δ¹¹B-PH technique, including the pKa, ionization constant of B(OH)3,δ¹¹Bsw of the seawater,δ¹¹B in B(OH)₄^-,and the fractionation factor α between B(OH)₄^- and B(OH)₃.Suggestions are made for future studies to improve the method for paleoceangraphic investigations.