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首页> 外文期刊>Geochemistry, geophysics, geosystems >Seasonal changes in magnetic parameters of sediments with changing redox conditions in Hiroshima Bay, Japan
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Seasonal changes in magnetic parameters of sediments with changing redox conditions in Hiroshima Bay, Japan

机译：随着日本广岛湾氧化还原条件的变化，沉积物磁参数的季节性变化

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摘要

To describe and interpret the relationship between spatial and seasonal changes in the sedimentary environment of nearshore sediments and their magnetic properties, magnetic and geochemical analyses were performed on sediment samples from three stations in Hiroshima Bay, Japan. Vertical stratification of the water column in the bay changes throughout the year, and magnetic hysteresis parameters and mineralogy in the bay sediments vary in response to changes in redox conditions of bottom waters. Magnetite and hematite are present year-round at all stations. The presence of maghemitized magnetite is inferred at a station located at the entrance to the bay. Greigite is recognized at all stations in September 2011 but is not found at the entrance to the bay when water column stratification is disturbed from October 2011. The presence of maghemite and goethite is inferred at two stations in the inner bay when the sedimentary environment is oxic. The remanent coercivity/coercivity ratio (H-cr/H-c) also varies, both spatially and temporally, which reflects changes in magnetic mineralogy. Increased of H-cr/H-c values are likely to be caused by goethite and/or maghemite formation when water column stratification is disturbed and the seafloor is oxic. Concentration-dependent magnetic parameters do not respond to seasonal changes in the redox conditions of bottom waters. Reaction times and/or changes in chemical and physical conditions may be insufficient to affect these parameters in the sediments of Hiroshima Bay.
机译：为了描述和解释近岸沉积物沉积环境的空间和季节变化及其磁性之间的关系，对日本广岛湾三个站点的沉积物样品进行了磁和地球化学分析。海湾水柱的垂直分层全年变化，并且海湾底泥中的磁滞参数和矿物学随底水氧化还原条件的变化而变化。所有站点全年都有磁铁矿和赤铁矿。磁化磁铁矿的存在可以从位于海湾入口处的站点推断出来。自2011年10月起，水柱分层受到干扰，在所有站点都识别出了Greigite，但在海湾的入口处未发现Greigite。在沉积环境为有氧的情况下，推断在内部海湾的两个站点中存在磁赤铁矿和针铁矿。 。剩余矫顽力/矫顽力比（H-cr / H-c）在空间和时间上也有所变化，这反映了磁性矿物学的变化。当水柱分层受到干扰且海底是有氧物质时，针铁矿和/或磁赤铁矿的形成可能会导致H-cr / H-c值增加。浓度相关的磁参数不响应底水氧化还原条件的季节性变化。反应时间和/或化学和物理条件的变化可能不足以影响广岛湾沉积物中的这些参数。

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