Sulfate reduction and sulfur fixation in sediment of a historically meromictic lake, Lake Suigetsu, Japan
Sulfate reduction and sulfur fixation in sediment of a historically meromictic lake, Lake Suigetsu, Japan
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日本水月湖历史上分流湖沉积物中的硫酸盐还原和硫固定
DOI：
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发表时间：
1982
期刊：
影响因子：
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通讯作者：
Y. Kitano
中科院分区：
文献类型：
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作者：
T. Masuzawa;Y. Kitano
硫酸盐，硫化氢，铁（II）的浓度在间隙沃茨和沉积物中的硫含量的垂直分布进行了研究，在沉积物芯（73厘米长）从一个半融湖，水月湖，从淡水到半咸水的条件下，在1664 A.D.的硅藻组合的沉积物也进行了分析。在52 cm深处发现了高硫（>1.5%）和低硫（<0.2%）的分界线。在高硫层（52 cm以上）中，35 ~ 37 cm处硫含量最高，为6.8%。而硅藻组合表明淡水和半咸水沉积物的分界线在40 cm处。在间隙沃茨中的硫化氢和铁（II）的配置文件表明，这些化学物质的下沉近40厘米的深度。52厘米处的化学定义边界与40厘米处的古生物定义边界之间的差异似乎是由于湖泊变得微咸后硫化氢的向下迁移和硫化铁的沉积造成的。
Vertical distributions of sulfate, hydrogen sulfide, and iron (II) concentrations in interstitial waters and of sulfur content in sediment have been studied in a sediment core (73 cm long) from a meromictic lake, Lake Suigetsu, which changed from fresh-water to brackish conditions in 1664 A.D. The diatom assemblage of the sediment has also been analyzed. A boundary between high (>1.5%) and low (<0.2%) sulfur contents is found at a depth of 52 cm in the core. In the high sulfur layer (above 52 cm), the maximum sulfur content is 6.8% at 35 to 37 cm. The diatom assemblage, however, indicates that the boundary between fresh-water and brackish sediments lies at 40 cm. The hydrogen sulfide and iron (II) profiles in the interstitial waters indicate a sink for these chemical species near a depth of 40 cm. The discrepancy between the chemically-defined boundary at 52 cm and the paleontologically-defined boundary at 40 cm seems to be due to the downward migration of hydrogen sulfide and deposition of iron sulfide after the lake became brackish.