Thorium and radiocarbon measurements on sediment cores from the Northseast Atlantic ...

• Main Authors: Thomson, John, Colley, S, Anderson, Robert F, Cook, G T, MacKenzie, Angus, Harkness, Douglas D
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1993
• Subjects: Box corer; D184; Discovery 1962; Biogeochemical Ocean Flux Study BOFS; Joint Global Ocean Flux Study JGOFS; Northeast Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.734066; https://doi.pangaea.de/10.1594/PANGAEA.734066

Radiocarbon and 230Thexcess data from six NE Atlantic box cores are considered. The cores form a transect from the Porcupine Abyssal Plain over the East Thulean Rise to the southern end of Feni Drift. The chronology for the cores is established from bulk sediment carbonate radiocarbon data and reveals that sections exhibiting constant accumulation rates can be identified in all the cores, with rates of 3.0-3.5 cm/kyr on the plain through the Holocene and late Holocene rates of 4.3-6.6 cm/kyr elsewhere. Five out of the six cores show accumulations of more 230Thexcess than is produced in the overlying water column, with the greatest inventories (up to 225% of production) in the cores from the rise and drift. A size fraction comparison between two cores from the plain and rise reveals that the higher overall accumulation rates and 230Thexcess inventories in the off-plain cores are due to an increased fine (<5 µm) component fraction, whereas the flux of coarser material is similar to that received on the ... : Supplement to: Thomson, John; Colley, S; Anderson, Robert F; Cook, G T; MacKenzie, Angus; Harkness, Douglas D (1993): Holocene sediment fluxes in the northeast Atlantic from 230Th excess and radiocarbon measurements. Paleoceanography, 8(5), 631-650 ...