Porewater and solid phase data for manganese, nickel, and cobalt as well as porewater data on oxygen and nitrate are presented for 15 sediment cores from the Clarion-Clipperton Zone, NE Pacific. The cores have been obtained during research cruise SONNE240 (Kuhn, et al., 2015; doi: 10.2312/cr_so240). The maximum age of the sediments recovered by the cores is the age of the ocean crust which is 20 Ma. The cores were taken to investigate the regional pattern of seawater circulation within the basaltic seafloor underneath its sediment cover. For this purpose, for each of the cores the composition of porewaters and the solid phase has been investigated. Core names, coordinates, and lengths are provided in the sediment_cores_overview.csv file. The oxygen measurements were performed onboard (May-June 2015) using using amperometric Clark-type oxygen sensors. All other analyses were performed after the cruise. The porewater analyses for cobalt, nickel have been performed using an inductively coupled plasma optical emission spectrometer (ICP-OES). For the porewater nitrate and Mn2+ analyses a QuAAtro Continuous Segmented Flow Analyser was used. The solid phase data were obtained after digestion of the sediment by ICP-OES, ICP-Mass Spectrometry (ICP-MS) and X-ray Fluorescence Spectroscopy (XRF). Cross calibration, was achieved by quantifying the same elements with ICP-MS, ICP-OES and XRF for a few cores. The datafiles with core data all start with the core name followed by an underscore.