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Effects of flow disturbances on Holocene planktonic foraminiferal ecostratigraphy

Sum, Lai Shan ; Wilson, Brent ; Ragoonath, Chantelle

Micropaleontology, 2020-01, Vol.66 (2), p.127-138 [Periódico revisado por pares]

Micropaleontology Project., Inc

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  • Título:
    Effects of flow disturbances on Holocene planktonic foraminiferal ecostratigraphy
  • Autor: Sum, Lai Shan ; Wilson, Brent ; Ragoonath, Chantelle
  • É parte de: Micropaleontology, 2020-01, Vol.66 (2), p.127-138
  • Descrição: The ecostratigraphy of offshore North Coast of Trinidad and near Tobago is poorly resolved, although biogenic gas production for which it would be useful is widespread. Recent work has shown that a wake and eddy in the Guiana Current and Orinoco Plume to the lee of NW Tobago influence benthic foraminiferal assemblages. This ecostratigraphical study of planktonic foraminiferal assemblages examines three piston cores taken on the lee of NW Tobago. Core 1 (upper bathyal) was most distal to the nutrient-rich Orinoco Plume and Core 3 (outer neritic) the most proximal. The assemblage turnover index (ATI) and analysis of variance (ANOVA) determined that the relative community stability at each site did not differ, showing similar community stabilities within the wake and plume. However, an abnormally high abundance of the deep-dwelling, nutrient-loving Globorotalia truncatulinoides dextral in Core 2 indicated an oceanographic boundary between Cores 1 and 2 along which the Orinoco Plume abuts the oligotrophic ocean. This is reflected in the distributions of other planktonic foraminiferal morphotypes such as G. bulloides, Gn. obesa and G. ruber pink. SHE analysis detected two biozones in Cores 2 and 3, possibly marking a change in nutrient influx. Principal component analysis reinforced the nutrient influx as amajor factor acting at Cores 2 and 3 in the wake and Orinoco Plume, Core 2 being seasonally impacted while Core 3 lies permanently within the Orinoco Plume. We conclude that oceanographic complexity off NW Tobago affects the distributions of planktonic foraminiferal morphotypes at the kilometer scale. Our results will prove to be a powerful tool in deciphering the geological history of the Orinoco Plume.
  • Editor: Micropaleontology Project., Inc
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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