Iron isotopes,represented by δ^(56)Fe,serve as valuable tools for constraining the surface iron processes and as potent tracers for studying the biogeochemical cycle of iron.Nevertheless,our comprehension of iron iso...Iron isotopes,represented by δ^(56)Fe,serve as valuable tools for constraining the surface iron processes and as potent tracers for studying the biogeochemical cycle of iron.Nevertheless,our comprehension of iron isotopes in the land surface processes of the Tibetan Plateau(TP)remains limited.In this study,we present the results of iron isotopic composition(δ^(56)Fe)in the surface soils of the TP,encompassing both glacial and non-glacial regions characterized by rugged and flat topographies.Our findings reveal that soil δ^(56)Fe values ranged from-0.01‰±0.05‰to 0.14‰±0.01‰,with the highest values observed in eastern locations(0.14‰)and the lowest appeared in the northeast(-0.1‰).On a global scale,the δ^(56)Fe values observed in Tibetan soils exhibited relatively small variability compared to reservoirs marked by significant iron isotope fractionation.By contrast,the range of TP soils measured here was slightly larger than that of the Chinese Loess.Furthermore,we discerned noticeable spatial variations in δ^(56)Fe across the large-scale region of TP,indicating a gradual increase trend from the northeast to the south and from the west to the east.These regional disparities in δ^(56)Fe likely arise from a combination of constraining factors,including differences in mineralogy,lithological variations,organic matter content,and variations in chemical weathering intensity.This study is pivotal in advancing our understanding of land surface iron isotope dynamics and its role in the biogeochemical cycle within the TP region.展开更多
基金supported by the National Natural Science Foundation of China (Nos.42201152,42371139)the Gansu Province Natural Science Foundation Key Project (No.23JRRA858)+2 种基金the Fundamental Research Funds for the Central Universities,China University of Geosciences (Wuhan) (No.CUG240629)the “CUG Scholar” Scientific Research Funds at China University of Geosciences (Wuhan) (No.2023092)EJRP is supported by the German Research Foundation (DFG) through the Heisenberg Programme “Multiscale Simulation of Earth Surface Processes”。
文摘Iron isotopes,represented by δ^(56)Fe,serve as valuable tools for constraining the surface iron processes and as potent tracers for studying the biogeochemical cycle of iron.Nevertheless,our comprehension of iron isotopes in the land surface processes of the Tibetan Plateau(TP)remains limited.In this study,we present the results of iron isotopic composition(δ^(56)Fe)in the surface soils of the TP,encompassing both glacial and non-glacial regions characterized by rugged and flat topographies.Our findings reveal that soil δ^(56)Fe values ranged from-0.01‰±0.05‰to 0.14‰±0.01‰,with the highest values observed in eastern locations(0.14‰)and the lowest appeared in the northeast(-0.1‰).On a global scale,the δ^(56)Fe values observed in Tibetan soils exhibited relatively small variability compared to reservoirs marked by significant iron isotope fractionation.By contrast,the range of TP soils measured here was slightly larger than that of the Chinese Loess.Furthermore,we discerned noticeable spatial variations in δ^(56)Fe across the large-scale region of TP,indicating a gradual increase trend from the northeast to the south and from the west to the east.These regional disparities in δ^(56)Fe likely arise from a combination of constraining factors,including differences in mineralogy,lithological variations,organic matter content,and variations in chemical weathering intensity.This study is pivotal in advancing our understanding of land surface iron isotope dynamics and its role in the biogeochemical cycle within the TP region.
