de.pangaea.dataset991015 und dataset PANGAEA

info@pangaea.de

https://www.pangaea.de/ information pointOfContact 2026-04-01T08:48:21Z https://doi.pangaea.de/10.1594/PANGAEA.991015 2026-04-01T08:48:12 publication Chu, Yongzhi https://orcid.org/0000-0002-2549-0670 information author Li, Xiaohu

xhli@sio.org.cn

author Xie, Ruifang C https://orcid.org/0000-0002-6628-9236 information author Conway, Tim M https://orcid.org/0000-0002-3069-9786 information author Xu, Antao

axu@geomar.de

https://orcid.org/0000-0002-5644-0852 information author Dong, Yanhui

dongyh@sio.org.cn

author PANGAEA

info@pangaea.de

https://www.pangaea.de/ information publisher tableDigital Iron (Fe) is a key micronutrient regulating marine productivity and the global carbon cycle, yet reconstructing the relative contributions of different Fe sources through time remains challenging. Here we present high-resolution iron isotopic compositions (δ56Fe), measured by multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS), from a Fe-Mn crust sample (CXD31) recovered from the North Pacific Ocean, spanning the past ~23 Myr. The Fe isotopic values vary within the range of modern marine Fe sources, reflecting dynamic mixing among atmospheric dust, sedimentary inputs, and hydrothermal contributions. Using isotope mass-balance calculations, we reconstruct temporal changes in the relative importance of these Fe sources since the Miocene. Three intervals characterized by elevated δ56Fe values (~16.9, ~11.6, and ~2.7 Ma) indicate enhanced inputs of isotopically heavy Fe, which we attribute to increased aeolian dust supply linked to progressive aridification of inland Asia. These Fe isotope data provide a long-term record of Fe source variability in the North Pacific and offer new constraints on the coupling between continental climate evolution and oceanic Fe cycling. completed Chu, Yongzhi https://orcid.org/0000-0002-2549-0670 information principalInvestigator Aeolian dust Ferromanganese crust Iron biogeochemsitry Isotopic fingerprinting Marine geochemistry North Pacific theme 1995-01-01 creation PANGAEA

info@pangaea.de

https://www.pangaea.de/ information pointOfContact copyright copyright CC-BY-4.0: Creative Commons Attribution 4.0 International textTable und geoscientificInformation 173.2 173.2 19.9 19.9 2003-07-19T00:00:00 2003-07-19T00:00:00 Age physicalMeasurement Ma Ma δ56Fe physicalMeasurement Multiple-collector inductively coupled plasma mass spectrometer (MC-ICPMS) ‰ ‰ δ56Fe, standard deviation physicalMeasurement Multiple-collector inductively coupled plasma mass spectrometer (MC-ICPMS); 2 SD ± ± text/tab-separated-values unknown https://doi.pangaea.de/10.1594/PANGAEA.991015?format=textfile download dataset The data set was checked for completeness, correctness, and consistency of metainformation. Validity of used methods was checked and - if applicable - precision and range of data. EVENT LABEL: 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 Fe–Mn crust collected by rock dredging on a seamount slope 2003-07-19T00:00:00