An improved boron isotope pH proxy calibration for the deep-sea coral Desmophyllum dianthus through sub-sampling of fibrous aragonite

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• 作者：Joseph A. Stewart^a ; ^b ; ^{Joseph.Stewart@noaa.gov} ; Eleni Anagnostou^a ; Gavin L. Foster^a
• 关键词：Desmophyllum dianthus ; Deep-sea coral ; pH ; Boron isotopes ; Trace element ; Fibrous aragonite
• 刊名：Chemical Geology
• 出版年：2016
• 出版时间：30 December 2016
• 年：2016
• 卷：447
• 期：Complete
• 页码：148-160
• 全文大小：1667 K
• 卷排序：447

文摘

δ11B of deep sea coral is potentially a powerful tool to reconstruct intermediate depth seawater pH. Microstructural heterogeneities result in uncertainty in pH derived from bulk skeletal δ11B. We present δ11B and trace element composition of micro-sampled fibrous aragonite from D. dianthus. δ11B of fibres lowest in Mg for each coral reveal a stronger, and better-defined dependence on ambient seawater pH. D. dianthus is an archive of precise palaeo-pH (< 0.1 pH units), providing that suitable sampling strategies are applied.