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Gastaldello, Maria Elena; Agnini, Claudia; Westerhold, Thomas; Drury, Anna Joy; Sutherland, Rupert; Drake, Michelle K; Lam, Adriane R; Dickens, Gerald Roy; Dallanave, Edoardo; Burns, Stephen J; Alegret, Laia (2023): Age model, geochemistry, XRF core scanning elemental data and benthic foraminifera from IODP Site 371-U1506 [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.953692

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Abstract:
The Late Miocene-Early Pliocene Biogenic Bloom (~9–3.5 Ma) was a paleoceanographic phenomenon defined by anomalously high accumulations of biological components at multiple open ocean sites, especially in certain regions of the Indian, and Pacific oceans. Its temporal and spatial extent with available information leaves fundamental questions about driving forces and responses unanswered. In this work, we focus on the middle part of the Biogenic Bloom (7.4–4.5 Ma) at International Ocean Discovery Program (IODP) Site 371-U1506 in the Tasman Sea, where we provide an integrated age model based on orbital tuning of the Natural Gamma Radiation (NGR), benthic foraminiferal oxygen isotopes, and calcareous nannofossil biostratigraphy. Benthic foraminiferal assemblages suggest changes in deep water oxygen concentration and seafloor nutrient supply during generally high export productivity conditions. From 7.4 Ma to 6.7 Ma, seafloor conditions were characterized by episodic nutrient supply, perhaps related to seasonal phytoplankton blooms. From 6.7 Ma to 4.5 Ma, the regime shifted to a more stable interval characterized by eutrophic and dysoxic conditions. Combined with seismic data, a regional change in paleoceanography is inferred at around 6.7 Ma, from stronger and well-oxygenated bottom currents to weaker, oxygen-depleted bottom currents. Our results support the hypothesis that the Biogenic Bloom was a complex, multiphase phenomenon driven by changes in ocean currents, rather than a single uniform period of sustained sea surface water productivity. Highly resolved studies are thus fundamental to its understanding and the disentanglement of local, regional, and global imprints.
Keyword(s):
Benthic foraminifera assemblages; Biogenic bloom; Calcareous nannofossils; Early Pliocene; Late Miocene; Tasman Sea
Supplement to:
Gastaldello, Maria Elena; Agnini, Claudia; Westerhold, Thomas; Drury, Anna Joy; Sutherland, Rupert; Drake, Michelle K; Lam, Adriane R; Dickens, Gerald Roy; Dallanave, Edoardo; Burns, Stephen J; Alegret, Laia (2023): The Late Miocene-Early Pliocene Biogenic Bloom: An integrated study in the Tasman Sea. Paleoceanography and Paleoclimatology, https://doi.org/10.1029/2022PA004565
Further details:
ReadMe- Supplementary information for Gastaldello et al. (2023)
Project(s):
Integrated Ocean Drilling Program / International Ocean Discovery Program (IODP)
Coverage:
Latitude: -28.662000 * Longitude: 161.740400
Date/Time Start: 2017-08-03T09:48:00 * Date/Time End: 2017-08-05T19:35:00
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
9 datasets

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Datasets listed in this bundled publication

  1. Gastaldello, ME; Agnini, C; Westerhold, T et al. (2023): Semi-quantitative calcareous nannofossils counts from IODP Hole 371-U1506A. https://doi.org/10.1594/PANGAEA.953691
  2. Gastaldello, ME; Agnini, C; Westerhold, T et al. (2023): Accumulation rates of benthic foraminifera from IODP Hole 371-U1506A. https://doi.org/10.1594/PANGAEA.953687
  3. Gastaldello, ME; Agnini, C; Westerhold, T et al. (2023): Relative cluster abundance of benthic foraminifera from IODP Hole 371-U1506A. https://doi.org/10.1594/PANGAEA.953682
  4. Gastaldello, ME; Agnini, C; Westerhold, T et al. (2023): Relative group abundance of benthic foraminifera from IODP Hole 371-U1506A. https://doi.org/10.1594/PANGAEA.953683
  5. Gastaldello, ME; Agnini, C; Westerhold, T et al. (2023): Stable isotope (δ¹³C) of Trilobatus sacculifer from IODP Hole 371-U1506A. https://doi.org/10.1594/PANGAEA.953685
  6. Gastaldello, ME; Agnini, C; Westerhold, T et al. (2023): Stable isotope (δ¹³C, δ¹⁸O) of Cibicides mundulus from IODP Hole 371-U1506A. https://doi.org/10.1594/PANGAEA.953684
  7. Gastaldello, ME; Agnini, C; Westerhold, T et al. (2023): Age model form IODP Hole 371-U1506A. https://doi.org/10.1594/PANGAEA.953690
  8. Gastaldello, ME; Agnini, C; Westerhold, T et al. (2023): Carbonate mass accumulation rates from IODP Hole 371-U1506A. https://doi.org/10.1594/PANGAEA.953689
  9. Gastaldello, ME; Agnini, C; Westerhold, T et al. (2023): XRF core scanning data from IODP Hole 371-U1506A. https://doi.org/10.1594/PANGAEA.955799