Evolution of ocean circulation and water masses in the Guaymas Basin (Gulf of California) during the last 31,000 years revealed by radiolarians and silicoflagellates in IODP expedition 385 sediment cores

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中文题名IODP 第385次科考采集的沉积物岩芯内的放射虫和硅鞭毛虫揭示了加利福尼亚湾瓜伊马斯盆地近31000年来的海洋环流和水团演变
作者M. Velázquez-Aguilar
作者单位Posgrado en Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, México City, México
刊名Frontiers in Earth Science
2024
12
摘要
Metallurgical industries incorporated into the living environment of the city cause significant enrichment of the topsoil with harmful substances including small size particulate matter, which contains heavy metals and magnetic iron oxides. The present study is focused on characterization of magnetic and geochemical pollution accumulated by urban soils in the city of Zaporizhzhia. Industrial dusts from the most powerful emmitants of airborne pollution are also analyzed. Two types of magnetic industrial emissions were discriminated to contribute in urban soil magnetization: spread of coarse-grained magnetite-bearing particles is limited to industrial zone, while smaller magnetic spherules were traced to settle far from the pollution sources bringing significant amounts of heavy metals to the soil. Magnetic susceptibility, saturation remanence and anhysteretic ratio of soil samples show strong relationship with heavy metals contents and pollution load index. Thus, magnetic parameters can serve as reliable proxies for complex urban and industrial pollution of soils. The obtained results provide important insight into magnetism and geochemistry of urban soils in Zaporizhzhia, characterizing the pollution rate as it was prior to the war situation starting in February 2022.

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