Age model, geochemistry, XRF core scanning elemental data and benthic foraminifera from IODP Site 371-U1506
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2023
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| _version_ | 1867168576274694144 |
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| author | 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 |
| author_facet | 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 |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_953692 |
| institution | PANGAEA |
| language | en |
| publishDate | 2023 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Age model, geochemistry, XRF core scanning elemental data and benthic foraminifera from IODP Site 371-U1506 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 Benthic foraminifera assemblages; Biogenic bloom; Calcareous nannofossils; Early Pliocene; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Late Miocene; Tasman Sea 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. |
| title | Age model, geochemistry, XRF core scanning elemental data and benthic foraminifera from IODP Site 371-U1506 |
| topic | Benthic foraminifera assemblages; Biogenic bloom; Calcareous nannofossils; Early Pliocene; Integrated Ocean Drilling Program / International Ocean Discovery Program; IODP; Late Miocene; Tasman Sea |
| url | https://doi.org/10.1594/PANGAEA.953692 |