/* DATA DESCRIPTION: Citation: Chu, Yongzhi; Li, Xiaohu; Xie, Ruifang C; Conway, Tim M; Xu, Antao; Dong, Yanhui (2026): In-situ concentrations of iron and aluminium in CXD31 sub-samples [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.991014 (DOI registration in progress) Abstract: Iron (Fe) availability in the ocean is strongly influenced by external inputs, including atmospheric deposition, sediment dissolution, and hydrothermal fluxes. To investigate long-term changes in Fe supply, we report in-situ measurements of Fe and aluminium (Al) concentrations from sub-samples of a Fe-Mn crust (CXD31) from the North Pacific Ocean, covering the last ~23 Myr. Iron concentrations exhibit a long-term increasing trend superimposed by several pronounced peaks, while Al concentrations co-vary with Fe during specific intervals, indicating variable terrigenous input. Periods of elevated Fe and Al concentrations at ~16.9, ~11.6, and ~2.7 Ma suggest intensified delivery of lithogenic material to the open ocean. We interpret these peaks as reflecting enhanced atmospheric dust fluxes associated with major phases of Asian inland aridification. The Fe–Al concentration dataset provides an independent geochemical archive for reconstructing variations in external Fe supply and supports a strong link between continental climate evolution and trace metal accumulation in the North Pacific. Keyword(s): Aeolian dust; Ferromanganese crust; Iron biogeochemsitry; Isotopic fingerprinting; Marine geochemistry; North Pacific Funding: National Key Research and Development Program of China, grant/award no. 2023YFC2811205 National Key Research and Development Program of China, grant/award no. 2023YFC2811305 National Natural Science Foundation of China (NSFC) (URI: https://www.nsfc.gov.cn/english/site_1/index.html), grant/award no. NSFC 42376035: Tracing water column export production and remineralization using Ba and Cd isotopes National Natural Science Foundation of China (NSFC) (URI: https://www.nsfc.gov.cn/english/site_1/index.html), grant/award no. U2244222 Second Institute of Oceanography, State Oceanic Administration, grant/award no. SZ2563 Coverage: LATITUDE: 19.900000 * LONGITUDE: 173.200000 DATE/TIME START: 2003-07-19T00:00:00 * DATE/TIME END: 2003-07-19T00:00:00 MINIMUM ELEVATION: -1357.0 m * MAXIMUM ELEVATION: -1357.0 m Event(s): DY105-12/14_CXD31 (CXD31) * LATITUDE: 19.900000 * LONGITUDE: 173.200000 * DATE/TIME: 2003-07-19T00:00:00 * ELEVATION: -1357.0 m * METHOD/DEVICE: Dredge, rock (DRG_R) * COMMENT: Fe–Mn crust collected by rock dredging on a seamount slope Parameter(s): Sample number (Sample no) * PI: Chu, Yongzhi (https://orcid.org/0000-0002-2549-0670) Age [Ma] (Age) * PI: Chu, Yongzhi (https://orcid.org/0000-0002-2549-0670) Iron [%] (Fe) * PI: Chu, Yongzhi (https://orcid.org/0000-0002-2549-0670) * METHOD/DEVICE: Electron probe microanalyzer (EPMA), JEOL JXA-iSP100 * COMMENT: wt% Aluminium [%] (Al) * PI: Chu, Yongzhi (https://orcid.org/0000-0002-2549-0670) * METHOD/DEVICE: Electron probe microanalyzer (EPMA), JEOL JXA-iSP100 * COMMENT: wt% License: Creative Commons Attribution 4.0 International (CC-BY-4.0) (URI: https://creativecommons.org/licenses/by/4.0/) Status: Curation Level: Enhanced curation (URI: https://wiki.pangaea.de/wiki/Curation_levels) Size: 416 data points */ Sample no Age [Ma] Fe [%] Al [%] CXD31-1 0.00 15.80 0.32 CXD31-2 0.20 14.16 0.25 CXD31-3 0.39 15.54 0.28 CXD31-4 0.59 17.66 0.33 CXD31-5 0.78 15.01 0.29 CXD31-6 1.05 15.70 0.33 CXD31-7 1.33 16.33 0.31 CXD31-8 1.60 16.25 0.31 CXD31-9 1.82 14.66 0.24 CXD31-10 1.93 14.30 0.23 CXD31-11 2.05 13.63 0.23 CXD31-12 2.17 14.39 0.24 CXD31-13 2.28 13.52 0.25 CXD31-14 2.40 15.66 0.25 CXD31-15 2.52 15.93 0.26 CXD31-16 2.72 23.25 0.65 CXD31-17 3.05 18.64 0.36 CXD31-18 3.23 16.45 0.28 CXD31-19 3.42 14.01 0.22 CXD31-20 3.66 14.41 0.22 CXD31-21 4.12 13.68 0.22 CXD31-22 4.31 14.72 0.25 CXD31-23 4.45 15.38 0.29 CXD31-24 4.59 11.92 0.21 CXD31-25 4.75 14.28 0.24 CXD31-26 4.90 9.83 0.21 CXD31-27 5.12 10.55 0.21 CXD31-28 5.89 9.80 0.20 CXD31-29 6.38 9.22 0.21 CXD31-30 6.61 13.72 0.22 CXD31-31 6.92 11.24 0.21 CXD31-32 7.20 11.83 0.21 CXD31-33 7.53 11.85 0.20 CXD31-34 7.70 12.40 0.22 CXD31-35 7.87 11.24 0.20 CXD31-36 8.04 13.09 0.24 CXD31-37 8.26 13.21 0.23 CXD31-38 8.37 14.56 0.27 CXD31-39 8.60 12.90 0.26 CXD31-40 8.86 10.27 0.20 CXD31-41 9.12 15.46 0.29 CXD31-42 9.23 9.40 0.20 CXD31-43 9.35 8.47 0.20 CXD31-44 9.54 9.13 0.21 CXD31-45 9.76 8.11 0.21 CXD31-46 9.93 8.32 0.21 CXD31-47 10.41 10.43 0.21 CXD31-48 10.89 11.67 0.24 CXD31-49 11.28 17.37 0.53 CXD31-50 11.58 18.05 0.65 CXD31-51 11.94 14.09 0.27 CXD31-52 12.16 18.20 0.37 CXD31-53 12.27 14.17 0.24 CXD31-54 12.44 13.03 0.23 CXD31-55 12.69 13.27 0.20 CXD31-56 12.88 16.54 0.28 CXD31-57 12.98 14.34 0.22 CXD31-58 13.10 14.22 0.23 CXD31-59 13.25 10.53 0.19 CXD31-60 13.39 12.15 0.28 CXD31-61 13.52 4.97 0.29 CXD31-62 13.63 4.34 0.32 CXD31-63 13.71 5.14 0.22 CXD31-64 14.07 5.80 0.21 CXD31-65 14.22 5.61 0.22 CXD31-66 14.71 4.47 0.18 CXD31-67 15.08 4.24 0.19 CXD31-68 15.31 5.18 0.19 CXD31-69 15.62 3.63 0.21 CXD31-70 15.92 3.36 0.19 CXD31-71 16.55 5.71 0.27 CXD31-72 16.94 10.44 0.36 CXD31-73 17.24 6.13 0.27 CXD31-74 17.41 5.25 0.20 CXD31-75 17.62 5.27 0.19 CXD31-76 17.95 5.35 0.17 CXD31-77 18.20 5.83 0.19 CXD31-78 18.42 6.22 0.16 CXD31-79 18.62 4.83 0.18 CXD31-80 18.89 3.93 0.22 CXD31-81 19.38 5.13 0.13 CXD31-82 19.76 3.86 0.18 CXD31-83 19.91 3.77 0.15 CXD31-84 20.06 6.05 0.16 CXD31-85 20.21 3.28 0.15 CXD31-86 20.36 5.60 0.12 CXD31-87 20.50 4.59 0.13 CXD31-88 20.62 5.25 0.13 CXD31-89 20.79 13.18 0.25 CXD31-90 21.07 5.41 0.11 CXD31-91 21.30 5.99 0.11 CXD31-92 21.53 9.63 0.20 CXD31-93 21.74 5.02 0.15 CXD31-94 21.94 4.40 0.14 CXD31-95 22.14 6.81 0.55 CXD31-96 22.30 5.64 0.12 CXD31-97 22.41 6.87 0.22 CXD31-98 22.51 7.78 0.34 CXD31-99 22.61 8.41 0.14 CXD31-100 22.69 4.79 0.17 CXD31-101 22.78 7.78 0.14 CXD31-102 22.86 4.66 0.13 CXD31-103 22.95 3.54 0.73 CXD31-104 23.03 13.14 0.31