Data report: IODP Expedition 339 Site U1391: an improved splice and preliminary age model on the basis of XRF data

Abstract

With the objective to reconstruct past primary production on the southwest Portuguese margin at orbital and millennial timescales through the Pleistocene, we chose to compare two sites recovered during Expedition 339 at similar latitude but different distances to the coast (Sites U1385 and U1391). Site U1385 has a well-estab- lished chronology, but for Site U1391 no isotope data are yet available. In order to develop a correct chronology without iso- tope data, we performed XRF analysis of cores from Holes U1391A and U1391B between 76.51 and 205.77 mbsf. With these data, in particular using log(Ca/Ti) and log(Ca/Fe), it was possible to en- hance the Site U1391 splice and to establish an age model based on the correlation to the well-defined and robust Site U1385 age model.