Siliceous components of Pliocene-Holocene sediments of the South Atlantic ...

• Main Authors: Westall, Francis, Fenner, Juliane M
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1991
• Subjects: Drilling/drill rig; Leg114; Joides Resolution; Ocean Drilling Program ODP; Antarc*; Antarctic
• Online Access: https://dx.doi.org/10.1594/pangaea.754904; https://doi.pangaea.de/10.1594/PANGAEA.754904

The Pliocene-Holocene sediments recovered on ODP Leg 114 from Holes 699A, 701C, and 704B are the subject of a detailed investigation to interpret changes in the Oceanographic environment of the South Atlantic in the vicinity of the Polar Front Zone (PFZ). The cores sample sediments at shallow (Hole 704B, 2532 m), intermediate (Hole 699A, 3716 m), and basinal (Hole 701C, 4647 m) depths. Sites 699 and 704 come under the influence of the Antarctic Circumpolar Current (ACC) and Circumpolar Deep Water. It is possible that the upper reaches of Antarctic Bottom Water (AABW) may also affect Hole 699A. Site 701 is influenced by AABW.Closely spaced samples were analyzed for grain-size distribution, sand fraction components, biosiliceous microfossils, organic carbon, and water content. PFZ migrations are traced using changes in bulk sedimentaccumulation rates and the abundance of the diatoms Actiniscus ssp. and Genus et species indet. 1 Fenner (1991), as well as changes in sediment grain size and ... : Supplement to: Westall, Francis; Fenner, Juliane M (1991): Pliocene-Holocene polar front zone in the South Atlantic: changes in its position and sediment-accumulation rates from Holes 699A, 701C, and 704B (synthesis). In: Ciesielski, PF; Kristoffersen, Y; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 114, 609-646 ...