Composition， Distribution and Constraint Factors of Fe Isotope(δFe) in the Surface Soils of the Tibetan Plateau
作者机构：State Key Laboratory of Cryosphere Sciences， Northwest Institute of Eco-Environment and Resources， Chinese Academy of Sciences Hubei Key Laboratory of Regional Ecology and Environmental Change， School of Geography and Information Engineering， China University of Geosciences Faculty of Physics， University of Duisburg-Essen Institute for Geophysics and Meteorology， University of Cologne
出 版 物：《Journal of Earth Science》 (地球科学学刊)
年 卷 期：2024年
核心收录：
学科分类：09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学]
基 金：supported by the National Natural Science Foundation of China (42201152, 42371139) the Gansu Province Natural Science Foundation Key Project (23JRRA858) And by the Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) (No.CUG240629) also the "CUG Scholar" Scientific Research Funds at China University of Geosciences (Wuhan) (Project No.2023092) EJRP is supported by the German Research Foundation (DFG) through the Heisenberg Programme “Multiscale Simulation of Earth Surface Processes”
摘 要：Iron isotopes， represented by δ56Fe， 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 (δ56Fe) 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 δ56Fe 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 δ56Fe 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 δ56Fe 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 δ56Fe 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 δ56Fe dynamics and its role in the biogeochemical cycle within the TP region.
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