PANGAEA_991015
Measured iron isotopic compositions of Fe-Mn crust sample CXD31
Chu, Yongzhi; Li, Xiaohu; Xie, Ruifang C; Conway, Tim M; Xu, Antao; Dong, Yanhui
Measured iron isotopic compositions of Fe-Mn crust sample CXD31
2026-04-01
PANGAEA
Dataset
https://doi.pangaea.de/10.1594/PANGAEA.991015
Investigator
Yongzhi
Chu
Earth Science
Age
δ56Fe
δ56Fe, standard deviation
geoscientificInformation
Aeolian dust
CXD31
Dredge, rock
DY105-12/14_CXD31
Ferromanganese crust
Iron biogeochemsitry
Isotopic fingerprinting
Marine geochemistry
North Pacific
Multiple-collector inductively coupled plasma mass spectrometer (MC-ICPMS)
2003-07-19
2003-07-19
Complete
19.9
19.9
173.2
173.2
unrestricted
CC-BY-4.0: Creative Commons Attribution 4.0 International
English
PANGAEA
Data Publisher for Earth & Environmental Science
https://www.pangaea.de/
Data Center Contact
Michael
Diepenbroek
info@pangaea.de
Leobener Str.
Bremen
Bremen
28359
Germany
online
78 data points
text/tab-separated-values
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. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.991015"!
DIF
9.4
2026-04-01
2026-04-01