Iron isotope fractionation during biogeochemical cycle: Information from suspended particulate matter (SPM) in Aha Lake and its tributaries, Guizhou, China
Iron isotope fractionation during biogeochemical cycle: Information from suspended particulate matter (SPM) in Aha Lake and its tributaries, Guizhou, China
复制标题
生物地球化学循环过程中的铁同位素分馏：来自中国贵州阿哈湖及其支流悬浮颗粒物（SPM）的信息
DOI：
10.1016/j.chemgeo.2010.11.006
复制
发表时间：
2011-01
期刊：
影响因子：
3.9
通讯作者：
Li, Jin
中科院分区：
文献类型：
--
作者：
Song, Liuting;Liu, Cong-Qiang;Wang, Zhong-Liang;Zhu, Xiangkun;Teng, Yanguo;Liang, Lili;Tang, Suohan;Li, Jin
为了解湖泊铁地球化学循环过程中铁同位素的行为，对云贵高原岩溶区人工湖阿哈湖及其支流夏季和冬季悬浮颗粒物（SPM）的铁同位素组成进行了研究。SPM的δ 56 Fe值相对于IRMM-014显示出统计学负偏移。湖泊样品夏季的变化范围为-1.36 ‰至-0.10 ‰，冬季为-0.30 ‰至-0.07 ‰;河流样品夏季的变化范围为-0.88 ‰至0.07‰，冬季为-0.35 ‰至-0.03 ‰。气溶胶样品的平均铁同位素组成为+0.10‰，与火成岩的0.09‰非常接近。大部分河流和水体中悬浮颗粒物δ 56 Fe值具有明显的季节变化，夏季悬浮颗粒物δ 56 Fe值低于冬季。河流颗粒物δ 56 Fe值的季节变化与流域内颗粒Fe来源和地球化学过程的变化有关：颗粒Fe更多地从土壤中淋溶出来，由含煤地层中广泛分布的黄铁矿风化产生。外源输入和铁的氧化还原循环共同控制着湖泊悬浮颗粒物δ 56 Fe值的变化。在夏季层化过程中，一个名为“铁轮”的铁循环在氧化还原边界附近建立，在那里向上扩散的Fe（II）被氧化，形成的反应性Fe氧化物将不断下沉回到还原区，以完成循环。SPM的δ 56 Fe值最小，DB站为-0.88 ‰，LJK站为-1.36 ‰，在氧化还原边界附近，这是Fe循环的结果，其中约45%~ 76%的Fe是由重复循环产生的。由于随机输运和扩散，氧化还原带附近颗粒的δ 56 Fe值呈近似高斯分布。DB站δ 56 Fe值与Fe/Al比值之间存在较好的负相关性，表明δ 56 Fe值与Fe/Al比值可以作为氧化还原驱动的Fe转化的良好指标。
Iron isotope compositions of suspended particulate matters (SPM) collected from the Aha Lake, an artificial lake in the karst area of Yun-Gui Plateau, and its tributaries in summer and winter were investigated for our understanding of the behavior of Fe isotopes during iron biogeochemical cycling in lake. δ56Fe values of SPM display statistically negative shift relative to IRMM-014. Samples from the lake display a range from −1.36‰ to −0.10‰ in summer and from −0.30‰ to −0.07‰ in winter, while river samples vary from −0.88‰ to 0.07‰ in summer and from −0.35‰ to −0.03‰ in winter. The average iron isotope composition of aerosol samples is +0.10‰, which is very similar to that of igneous rocks (0.09‰). The SPM in most rivers and water column showed seasonal variation in δ56Fe value: the δ56Fe values of SPM in summer were lower than in winter. The seasonal variation in δ56Fe value of the riverine SPM should be ascribed to the change in source of particulate Fe and geochemical process in the watershed: More particulate Fe was leached from soil and produced by weathering of pyrite widely distributed in coal-containing strata. It is suggested that both allochthonous inputs and the redox iron cycling control the variations of δ56Fe values for SPM in lake. During summer stratification, an Fe cycle named “ferrous wheel” is established near the redox boundary where the upwardly diffusing Fe(II) is oxidized and the reactive Fe oxides formed will continuously sink back into the reduction zone to complete the cycle. The δ56Fe values for SPM reach the minima, −0.88‰ for DB station and −1.36‰ for LJK station, just near the redox boundary as a result of the Fe cycling, where a rough 45% to 76% of Fe in these particles was produced by the repetitive cycle. Due to random transportation and diffusion, δ56Fe values of the particles near the redox zone distributed into approximately a Gaussian shape. The good negative correlation existed between δ56Fe values and Fe/Al ratios for DB station, suggesting that they together can be used as good indicators of the redox-driven Fe transformations.
登录
查看更多内容
影响因子：
5
作者：
Balci, N;Bullen, TD;Mandernack, KW
通讯作者：
Mandernack, KW
影响因子：
64.8
作者：
E. Perdue;K. Beck;J. Reuter
通讯作者：
E. Perdue;K. Beck;J. Reuter
影响因子：
5.8
作者：
A. Draut;P. Clift
通讯作者：
A. Draut;P. Clift
影响因子：
3.4
作者：
B. Bellanger;S. Huon;P. Steinmann;F. Chabaux;F. Velasquez;V. Vallès;K. Arn;N. Clauer;A. Mariotti
通讯作者：
B. Bellanger;S. Huon;P. Steinmann;F. Chabaux;F. Velasquez;V. Vallès;K. Arn;N. Clauer;A. Mariotti
影响因子：
5
作者：
S. Welch;B. Beard;C. Johnson;P. S. Braterman
通讯作者：
S. Welch;B. Beard;C. Johnson;P. S. Braterman