侏罗纪增生杂岩中分离湖相沉积物有机质对砷富集的氧化还原控制

IF 11.3 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Yuma Masuki , Nagayoshi Katsuta , Sayuri Naito , Takuma Murakami , Ayako Umemura , Natsuko Fujita , Akihiro Matsubara , Masayo Minami , Masakazu Niwa , Hidekazu Yoshida , Satoru Kojima
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引用次数: 0

摘要

用季节分辨率分析了湖泊层状沉积物中砷的氧化态和分布。该矿床形成于日本中部安内河上游的中全新世滑坡淤积古湖泊中,古湖泊流域由侏罗纪增生杂岩(米诺-坦巴带)组成,包括沉积岩和火成岩。露头发育厘米-分米级粉质粘土层与层状层交替发育。两层中As的体积浓度平均为77±27 μg/g,主要分布在硫化物中(59%±9%)。在叠层中,富有机质层和富菱铁矿层重复出现,分别表明在春季和秋季混合和夏季分层期间沉积。富OM层明显含有集中在菱铁矿层边缘的富as层,而富as热点与S和无定形OM共存。基于同步加速器的微x射线吸收近边结构分析表明,富As层中含有大致相同水平的fa - is、AsIIS和AsIII2S3,而热点处的As以fa - is为主。综上所述,沉积物中As的富集受OM供应的季节变化和沉积后OM降解引起的氧化还原电位波动的控制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Redox control in arsenic accumulation with organic matter derived from a varved lacustrine deposit in the Jurassic accretionary complexes

Redox control in arsenic accumulation with organic matter derived from a varved lacustrine deposit in the Jurassic accretionary complexes
Oxidation states and distribution of arsenic (As) in annually laminated (varved) lacustrine deposits were analyzed with a seasonal resolution. This deposit was formed in the mid-Holocene landslide-dammed paleolake in the upper reaches of the Ane River, central Japan and the paleolake watershed consists of the Jurassic accretionary complexes (Mino-Tamba belt) including sedimentary and igneous rocks. In the outcrop, centimeter-to-decimeter-scale silty clay layers alternating with laminated layers are well developed. Bulk concentrations of As in the two layers are 77 ± 27 μg/g on average and mostly occurred in the sulfide fraction (59 % ± 9 %). In the laminated layers, millimeter-scale organic matter (OM)-rich and siderite-rich layers were repeated, indicating deposition during the spring and autumn mixings and the summer stratification, respectively. The OM-rich layers distinctively contain As-rich layers concentrated at the margins of the siderite layers, while they have numerous As-rich hotspots coexisting with S and amorphous OM. Synchrotron-based micro-X-ray absorption near edge structure analysis demonstrated that the As-rich layers contain FeAs–IS, AsIIS, and AsIII2S3 at roughly the same levels, whereas FeAs–IS is dominant for the As in hotspots. Based on the results, it is suggested that As accumulation in the varved deposit has been controlled by seasonal changes in OM supply and fluctuation in redox potential with post-depositional degradation of OM.
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来源期刊
Journal of Hazardous Materials
Journal of Hazardous Materials 工程技术-工程:环境
CiteScore
25.40
自引率
5.90%
发文量
3059
审稿时长
58 days
期刊介绍: The Journal of Hazardous Materials serves as a global platform for promoting cutting-edge research in the field of Environmental Science and Engineering. Our publication features a wide range of articles, including full-length research papers, review articles, and perspectives, with the aim of enhancing our understanding of the dangers and risks associated with various materials concerning public health and the environment. It is important to note that the term "environmental contaminants" refers specifically to substances that pose hazardous effects through contamination, while excluding those that do not have such impacts on the environment or human health. Moreover, we emphasize the distinction between wastes and hazardous materials in order to provide further clarity on the scope of the journal. We have a keen interest in exploring specific compounds and microbial agents that have adverse effects on the environment.
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