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<p>Planktonic foraminifera in ocean sediments serve as unique paleoenvironmental recorders, and their distribution and diversity are affected by environmental factors. The northwest Indian Ocean, influenced by monsoons and ocean-basin-ridge systems, is a key research area in this regard. However, few studies have focused on the foraminiferal distribution in surface sediments. We analyzed 60 surface sediment samples in April 2023, from which 11 genera and 32 warm-water species were identified. The distribution was primarily controlled by depth-dependent carbonate dissolution, temperature-salinity gradients, and monsoon-driven hydrography. Four distinct assemblages were identified: the Arabian Basin assemblage (dominated by <i>Globorotalia cultrata</i>) demonstrates strong influence from the Arabian Sea high-salinity water and winter monsoon circulation; the Carlsberg Ridge assemblage (dominated by <i>G. cultrata</i>, <i>Globorotalia tumida</i>) exhibits depth-controlled productivity signatures; the Carlsberg Ridge Flanks assemblage (mainly including <i>Globigerinita glutinata</i>, <i>G. cultrata</i>, <i>Globigerinoides ruber</i>) reflects monsoon-induced mixing processes; and the Somali Basin assemblage (including mainly <i>G. cultrata</i>, <i>Pulleniatina obliquiloculata</i>, <i>G. tumida</i>) shows clear imprints of summer monsoon upwelling. Carbonate dissolution in the Somali Basin is strongest, followed by Arabian Basin, the Carlsberg Ridge showed the weakest dissolution. Based on planktonic foraminiferal abundance, fragmentation rate, CaCO<sub>3</sub> content, and dissolution susceptible/resistant species, the carbonate lysocline and compensation depth were estimated at ∼3 700 and ∼4 800 m, respectively.</p>

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Oceanographic significance of planktonic foraminiferal assemblages in the northwest Indian Ocean-Basin-Ridge system under monsoon influence

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Feng Wang,
  • Yunhai Li,
  • Xuan Ding,
  • Mingjiang Cai,
  • Zhikun Lai,
  • Jian Chen,
  • Pengfei Shen,
  • Liang Wang,
  • Xiang Ye

摘要

Planktonic foraminifera in ocean sediments serve as unique paleoenvironmental recorders, and their distribution and diversity are affected by environmental factors. The northwest Indian Ocean, influenced by monsoons and ocean-basin-ridge systems, is a key research area in this regard. However, few studies have focused on the foraminiferal distribution in surface sediments. We analyzed 60 surface sediment samples in April 2023, from which 11 genera and 32 warm-water species were identified. The distribution was primarily controlled by depth-dependent carbonate dissolution, temperature-salinity gradients, and monsoon-driven hydrography. Four distinct assemblages were identified: the Arabian Basin assemblage (dominated by Globorotalia cultrata) demonstrates strong influence from the Arabian Sea high-salinity water and winter monsoon circulation; the Carlsberg Ridge assemblage (dominated by G. cultrata, Globorotalia tumida) exhibits depth-controlled productivity signatures; the Carlsberg Ridge Flanks assemblage (mainly including Globigerinita glutinata, G. cultrata, Globigerinoides ruber) reflects monsoon-induced mixing processes; and the Somali Basin assemblage (including mainly G. cultrata, Pulleniatina obliquiloculata, G. tumida) shows clear imprints of summer monsoon upwelling. Carbonate dissolution in the Somali Basin is strongest, followed by Arabian Basin, the Carlsberg Ridge showed the weakest dissolution. Based on planktonic foraminiferal abundance, fragmentation rate, CaCO3 content, and dissolution susceptible/resistant species, the carbonate lysocline and compensation depth were estimated at ∼3 700 and ∼4 800 m, respectively.