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<p>The analysis of fossil diatoms preserved in continental shelf sediments can provide detailed insights into the paleoecological and environmental history of marginal seas. In this study, we consider the development of the northern South China Sea based on a 302-m-long drilling core taken on the outer continental shelf. Diatoms were absent in more than half of the analyzed samples, a relatively low absolute abundance, so that a diatom-based biostratigraphy could not be established. The low absolute abundance suggests that diatom preservation was poor because of highly dynamic oceanographic conditions and significant biosilica dissolution. The dominance of coastal species and the intermittent presence of mostly tropical open-sea diatoms along the core reflects strong land-sea interactions and a current circulation influenced by sea-level fluctuations, following the glacial and interglacial cycles of the Quaternary period. This study provides clues concerning the evaluation of diatom fossils in micropaleontology, as well as their role in biogeochemical cycles within complex sedimentary processes across various marginal sea shelves.</p>

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Fossil diatoms and their significance for paleoenvironment construction on the shelf of Northern South China Sea

  • 期刊论文

  • 发表日期：

    2025年5月6日

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  • Jinpeng Zhang,
  • Yingzhi Ren,
  • Chong Sheng,
  • Peter D. Clift,
  • Bin Yang,
  • Dehao Xie,
  • Jinwei Zhang,
  • Taihao Chen,
  • Shengzhong Ma,
  • Ningfeng Zeng,
  • Yanbiao Chen,
  • Yaohong Shi,
  • Gongping Tu

摘要

The analysis of fossil diatoms preserved in continental shelf sediments can provide detailed insights into the paleoecological and environmental history of marginal seas. In this study, we consider the development of the northern South China Sea based on a 302-m-long drilling core taken on the outer continental shelf. Diatoms were absent in more than half of the analyzed samples, a relatively low absolute abundance, so that a diatom-based biostratigraphy could not be established. The low absolute abundance suggests that diatom preservation was poor because of highly dynamic oceanographic conditions and significant biosilica dissolution. The dominance of coastal species and the intermittent presence of mostly tropical open-sea diatoms along the core reflects strong land-sea interactions and a current circulation influenced by sea-level fluctuations, following the glacial and interglacial cycles of the Quaternary period. This study provides clues concerning the evaluation of diatom fossils in micropaleontology, as well as their role in biogeochemical cycles within complex sedimentary processes across various marginal sea shelves.