IODP Proceedings    Volume contents     Search


Data report: calcium carbonate and total organic carbon records from IODP Expedition 339 Sites U1385 and U13911

Fatima Abrantes1,2, 3, 4


Sedimentary inorganic calcium carbonate CaCO3 and total organic carbon (TOC) are two of the most commonly used indicators of past oceanic productivity. In this report, we present CaCO3 and TOC records from Integrated Ocean Drilling Program Expedition 339 Sites U1385 and U1391 drilled in the southwest Iberian margin. Identified as a key region to establish the marine-ice-terrestrial linkages crucial for understanding the Earth’s climate system, this margin is also characterized by seasonal coastal upwelling–related high primary production. These IODP sites constitute a depth transect across a productivity gradient allowing for the investigation of the impact of climate variations on marine production and preservation.

A total of 420 samples were analyzed for the 75–100 meters composite depth (mcd) interval at Site U1385 and for the 160–220 mcd interval at Site U1391. Results show at least two scales of variability for both CaCO3 and TOC, which are comparable between sites but have a better-defined long-term trend on the CaCO3 record.

1 Abrantes, F., 2016. Data report: calcium carbonate and total organic carbon records from IODP Expedition 339 Sites U1395 and U1391. In Stow, D.A.V., Hernández-Molina, F.J., Alvarez Zarikian, C.A., and the Expedition 339 Scientists, Proceedings of the Integrated Ocean Drilling Program, 339: Tokyo (Integrated Ocean Drilling Program Management International, Inc.).

2 Divisão de Geologia e Georecursos Marinhos, Instituto Português do Mar e da Atmosfera (IPMA), Rua Alfredo Magalhães Ramalho 6, 1495-006 Lisboa, Portugal.

3 Also at Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), Universidade do Porto, Rua dos Bragas 287, 4050-123 Porto, Portugal.

4 Also at Centro de Ciencias do Mar (CCMAR), Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal.

Initial receipt: 12 February 2015
19 April 2016
Publication: 27 October 2016
MS 339-201