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Abstract <p>Four radiolarian zones are established, viz. <i>Buccinosphaera invaginata</i> (NR1), <i>Collosphaera tuberosa</i> (NR2/3), <i>Amphirhopalum ypsilon</i> (NR4) and <i>Anthocyrtidium angulare</i> (NR5) in the core ABP-06, central Indian Ocean. The radiolarian events within the biozones are also marked. Three reworked species are noted like <i>Spongaster pentas,</i> <i>Acrosphaera spinosa echinoides</i> and <i>Collosphaera glebulenta</i>. In the older part of the sequence, reworking is on minor scale but more pronounced in the younger part. In the sequence studied, the base of <i>Buccinosphaera invaginata</i> is marked at 0.18 Ma and that of <i>Collosphaera tuberosa</i> at 0.5 Ma in the central Indian Ocean region. Further, it is observed that radiolarian zones NR1 and NR2/NR3 are equivalent to planktonic foraminiferal Zone N23 in the Indian Ocean.</p>

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Biostratigraphy and Events of Pleistocene Radiolaria in the Core ABP-06, Central Indian Ocean

  • 期刊论文

  • 发表日期：

    2025年5月23日

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  • Girish Kumar Sharma,
  • Soreingam A Shatsang,
  • Deeksha Bohra,
  • Abhishek Kohli

摘要

Abstract

Four radiolarian zones are established, viz. Buccinosphaera invaginata (NR1), Collosphaera tuberosa (NR2/3), Amphirhopalum ypsilon (NR4) and Anthocyrtidium angulare (NR5) in the core ABP-06, central Indian Ocean. The radiolarian events within the biozones are also marked. Three reworked species are noted like Spongaster pentas, Acrosphaera spinosa echinoides and Collosphaera glebulenta. In the older part of the sequence, reworking is on minor scale but more pronounced in the younger part. In the sequence studied, the base of Buccinosphaera invaginata is marked at 0.18 Ma and that of Collosphaera tuberosa at 0.5 Ma in the central Indian Ocean region. Further, it is observed that radiolarian zones NR1 and NR2/NR3 are equivalent to planktonic foraminiferal Zone N23 in the Indian Ocean.