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Title
  • en Nitrogen isotopes in intra-crystal coralline aragonites
Creator
    • en Yamazaki, Atsuko
    • en Takahata, Naoto
    • en Sano, Yuji
    • en Tsunogai, Urumu
Accessrights open access
Subject
  • Other en Coral skeletons
  • Other en Nitrogen isotopes
  • Other en Pliocene
  • Other en Stepwise heating methods
  • NDC 450
Description
  • Abstract en To assess the preservation of the nitrogen isotope composition in reef corals, nitrogen isotopes in a well-preserved Pliocene fossil coral (located in the Tartaro formation on Luzon Island, Philippines (14°N, 121°E)) and in a modern coral (Kochi, Japan (32°N, 132°E)) were analysed using stepwise heating methods. The thermal decomposition of aragonite triggered the largest release of nitrogen at 700 °C for the modern coral and 550 °C for the Pliocene coral. The highest rate of nitrogen gas emission occurred at the aragonite collapse temperature, indicating that organic nitrogen was bound within the intra-crystals of coralline aragonites in both corals. After the aragonite collapsed in both corals, the nitrogen isotope ratios increased due to fractionation and then decreased to values similar to those observed in bulk samples of the modern (+ 10.1%) and Pliocene (+ 4.4%) corals. These results suggested that fresh organic nitrogen was released due to the decomposition of the internal skeletal structure at higher temperatures (900–1000 °C). Nitrogen isotopes in coral skeletons were preserved in intra-crystal aragonite, even in a Pliocene fossil, and stepwise heating methods were shown to be useful for determining the preservation of coralline nitrogen isotopes.
Publisher en Elsevier
Date
    Issued2013-08-02
Language
  • eng
Resource Type journal article
Version Type AM
Identifier HDL http://hdl.handle.net/2115/56435
Relation
  • isVersionOf DOI https://doi.org/10.1016/j.chemgeo.2013.05.024
Journal
    • PISSN 0009-2541
      • en Chemical Geology
      • Volume Number351 Page Start276 Page End280
File
Oaidate 2023-07-26