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February 25, 2026Paleoceanography and PaleoclimatologyOpen Access

Changes in the Indonesian Throughflow Since the Late Miocene Based on Radiolarian Assemblages From ODP Site 710 in the Western Tropical Indian Ocean: Implications of the Indo‐Pacific Gateway (Indonesian Seaway)

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Authors

SKShin‐ichi KamikuriKMKenji M. Matsuzaki

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Overview

Analysis demonstrates paleoceanographic transitions in the Indo-Pacific Gateway, suggesting changes in oceanic salinity.

Key Points

  • The aim is to investigate historical variability in the Indonesian Throughflow since the Late Miocene using radiolarian data.
  • Analyzed radiolarian assemblages from Ocean Drilling Program Site 710 in the western tropical Indian Ocean.
  • Categorized taxa into surface ITF taxa and thermocline ITF taxa.
  • Reconstructed salinity and temperature changes based on radiolarian data over geological time scales.
  • Notable decrease in surface ITF taxa relative abundance at 7.5 Ma.
  • Faunal turnover from high-salinity to low-salinity thermocline taxa observed at 3.5 Ma.
  • Radiolarian-based sea surface temperature data indicated cooling from 9.0 to 6.5 Ma, followed by a warming trend from 4.5 to 2.0 Ma.

Cite This Study

Kamikuri et al. (2026) studied this question.

synapsesocial.com/papers/699e921bf5123be5ed05028dhttps://doi.org/10.1029/2025pa005165
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