Age models for ODP Leg 172 sites ...

• Main Authors: Gruetzner, Jens, Giosan, Liviu, Franz, Sven-Oliver, Tiedemann, Ralf, Cortijo, Elsa, Chaisson, William P, Flood, Roger D, Hagen, Sveinung, Keigwin, Lloyd D, Poli, Maria-Serena, Rio, Domenico, Williams, Thomas
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2002
• Subjects: Composite Core; Leg172; Joides Resolution; Ocean Drilling Program ODP; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.742089; https://doi.pangaea.de/10.1594/PANGAEA.742089

Ten ODP sites drilled in a depth transect (2164-4775 m water depth) during Leg 172 recovered high-deposition rate (>20 cm/kyr) sedimentary sections from sediment drifts in the western North Atlantic. For each site an age model covering the past 0.8-0.9 Ma has been developed. The time scales have a resolution of 10-20 kyr and are derived by tuning variations of estimated carbonate content to the orbital parameters precession and obliquity. Based on the similarity in the signature of proxy records and the spectral character of the time series, the sites are divided into two groups: precession cycles are better developed in carbonate records from a group of shallow sites (2164-2975 m water depth, Sites 1055-1058) while the deeper sites (2995-4775 m water depth, Sites 1060-1063) are characterized by higher spectral density in the obliquity band. The resulting time scales show excellent coherence with other dated carbonate and isotope records from low latitudes. Besides the typical Milankovitch cyclicity ... : Depth = mcd ...