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Abrupt conclusion of the late Miocene-early Pliocene biogenic bloom at 4.6-4.4 Ma

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  • B. – Th. Karatsolis

    (Uppsala University)

  • B. C. Lougheed

    (Uppsala University)

  • D. De Vleeschouwer

    (University of Bremen
    Westfälische Wilhelms-Universität, University of Münster)

  • J. Henderiks

    (Uppsala University)

Abstract

The late Miocene-early Pliocene biogenic bloom was an extended time interval characterised by elevated ocean export productivity at numerous locations. As primary productivity is nutrient-limited at low-to-mid latitudes, this bloom has been attributed to an increase or a redistribution of available nutrients, potentially involving ocean-gateway or monsoon-related mechanisms. While the exact causal feedbacks remain debated, there is even less consensus on what caused the end of the biogenic bloom. Here, we compile Mio-Pliocene paleoproductivity proxy data from all major ocean basins to evaluate the timing and pacing of this termination. This systematic analysis reveals an abrupt and sustained reduction in low-latitude ocean productivity at 4.6–4.4 Ma. The decline in productivity coincided with a prolonged period of low orbital eccentricity and a shift towards lower-amplitude obliquity, an astronomical configuration linked to reduced East Asian Monsoon intensity and decreased riverine nutrient supply.

Suggested Citation

  • B. – Th. Karatsolis & B. C. Lougheed & D. De Vleeschouwer & J. Henderiks, 2022. "Abrupt conclusion of the late Miocene-early Pliocene biogenic bloom at 4.6-4.4 Ma," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-021-27784-6
    DOI: 10.1038/s41467-021-27784-6
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