Mineral magnetic properties of surface sediments at Bei’anhe, Beijing, and its environmental significance

Wang, Hongqiang; Zhang, Shihong; Li, Haiyan

doi:10.1007/s11434-008-0228-2

Cited by 4 publications

(3 citation statements)

References 45 publications

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“…The SIRM value can also be used as an estimate of the concentration of magnetic minerals in the sample [18]. Higher intensity of SIRM means higher concentration of magnetic minerals, and vice versa.…”

Section: Discussionmentioning

confidence: 99%

“…The upper sections of the sediment core, from the surface to 18 cm depth, are characterized by increasing  LF , while the lower section from 18 Isothermal remanent magnetization (IRM) measured on selected samples at 100 mT, 300 mT, and 2500 mT also shows interesting variations. The ratio of IRM 300mT to IRM 2500mT (SIRM), termed the S-ratio [18], can be used to infer the dominant magnetic mineral present and, in particular, to distinguish between magnetite and hematite. This differentiation is possible because the ferrimagnetic mineral (i.e.…”

Section: Variations Of Magnetic Mineral Properties Along the Coresmentioning

confidence: 99%

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The Magnetic Properties of Indonesian Lake Sediment: A Case Study of a Tectonic Lake in South Sulawesi and Maar Lakes in East Java

Tamuntuan¹,

Bijaksana²,

Gaffar³

et al. 2010

itbj.sci.

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Abstract. Magnetic properties of sediments from two different environmental settings in Indonesia have been studied using rock magnetic methods and scanning electron microscopy (SEM). In the first setting, magnetic measurements were conducted on core sediments from two maar lakes in East Java (Lakes Lading and Bedali) that represent very confined environments where sediments are derived mainly from rocks and soils within the craters. In the second setting, similar measurements were obtained on core sediment from Lake Matano, a cryptodepression lake in tectonically active South Sulawesi where the area around the lake is dominated by highly magnetic lateritic soils. The results show that the predominant magnetic mineralogy in sediments from Lakes Lading, Bedali, as well as Matano is pseudo-single domain (PSD) magnetite (Fe 3 O 4 ). Compared to that of Lake Matano, the maar lake sediments of Lakes Lading and Bedali have higher magnetic susceptibility as well as high intensity of ARM and SIRM. Variations in magnetic susceptibility in all core sediments are controlled mainly by the concentration of magnetic minerals. The homogeneity of magnetic minerals in these three lakes sediment provides an excellent setting for interpreting paleoclimatic signals as they will be recorded as anomalies of magnetic susceptibility.

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Section: Discussionmentioning

confidence: 99%

Section: Variations Of Magnetic Mineral Properties Along the Coresmentioning

confidence: 99%

The Magnetic Properties of Indonesian Lake Sediment: A Case Study of a Tectonic Lake in South Sulawesi and Maar Lakes in East Java

Tamuntuan¹,

Bijaksana²,

Gaffar³

et al. 2010

itbj.sci.

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show abstract

“…Dry sediments on impervious surfaces in urban areas compose one of the most important sources of pollutants in stormwater and may enter runoff in dissolved, colloidal and particulate-bound forms during rainfall events [3][4][5]. The characteristics of pollutant transformation from dry sediments to dissolved, colloidal and particulate-bound forms are important for understanding pollutant behavior in stormwater [6][7][8]. Some research has been undertaken on dry sediment desorption [9,10] and the results show that most of the total phosphorus (TP) is attached to the particulates after wet sieving.…”

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confidence: 99%

Desorption characteristics of total phosphorus and heavy metals from impervious urban surface sediments

Tian

et al. 2013

Chin. Sci. Bull.

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Dry sediments were collected from one roof and two roads in the central area of Beijing. The sediments were dry and wet sieved. The concentrations of total phosphorus (TP) and heavy metals were analyzed. The highest mass proportion of the dry sediments from the roads were between 125 and 300 μm in diameter, while the roof sediments were much smaller, with 75% of the total sediment mass between 40 and 74 μm in diameter. The concentrations of TP and heavy metals in the roof sediments were much higher than in the road sediments. The concentrations of the six heavy metals investigated had a similar order for all three sampling sites, with the Zn concentration always being the highest, followed by the Mn concentration, and the Ni concentration was always the lowest. After wet sieving, 76.9% to 91% of the TP in the sediments from the three sites remained in undesorbable particulate form, and 68.9% to 97% of the heavy metals were present in undesorbable particulate form. The concentrations of undesorbed heavy metals in the roof sediments tended to increase with increasing sediment size, but a similar trend was not found in the road sediments. This study shows that more attention should be given to the particulate matter in stormwater runoff, as reducing the amount of particulates will improve the efficiency of pollution control measures.Beijing, desorption capacity, heavy metals, sediments, sieving, total phosphorus Citation:Li Y X, Xiang L, Tian P, et al. Desorption characteristics of total phosphorus and heavy metals from impervious urban surface sediments. Chin Sci Bull, 2013, 58: 33573360,

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Comparison of Topsoil Magnetic Properties Between the Loess Region in Tianshan Mountains and Loess Plateau, China, and Its Environmental Significance

Guo

Liu

Lü

et al. 2011

Chinese J of Geophysics

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The topsoils of the loess region of Tianshan Mountains and Loess Plateau in northwestern China are systematically collected and analysed on their rock magnetism and grain size. Their magnetic characteristics indicate that high magnetic minerals are magnetite and maghemite, and the weakly magnetic minerals are hematite, goethite or lepidocrocite. There are at least parts of maghemite deposited in the Loess Plateau that was originally from aeolian source area. The grain size of magnetic minerals (and particle size) in Tianshan topsoil samples is generally much coarser; mostly within range of multi-domain (MD). Hard magnetic minerals in Tianshan topsoils are in higher percentage than that in Loess Plateau. The magnetic susceptibility of topsoils from Loess Plateau shows a good positive relation with frequency dependent susceptibility. Climatic condition, such as temperature and precipitation, especially the latter one, is explained as a major factor effecting susceptibility enhancement in the Loess Plateau. Tianshan topsoil samples contain a very small amount of ultrafine magnetic grains produced during pedogenic process, such ultrafine magnetic grains have very limited contribution to the susceptibility enhancement. Tianshan topsoils generally show a characteristic of less weathering or weak pedogenesis, aeolian coarser grains therefore play an important role in mechanism of magnetic susceptibility. Frequency dependent susceptibility shows a close relation with mean annual precipitation (MAP) in all studied areas, However, the relations between magnetic susceptibility and MAP are different in various regions: showing positive correlation in the central Loess Plateau (study area), but negative in Tianshan regions. The precondition of 'wind vigor' model is discussed, 'wind vigor' theory is debated as not suitable for interpretation of Alaskan and Siberian loess, but suitable for Xinjiang loess.

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Mineral magnetic properties of surface sediments at Bei’anhe, Beijing, and its environmental significance

Cited by 4 publications

References 45 publications

The Magnetic Properties of Indonesian Lake Sediment: A Case Study of a Tectonic Lake in South Sulawesi and Maar Lakes in East Java

The Magnetic Properties of Indonesian Lake Sediment: A Case Study of a Tectonic Lake in South Sulawesi and Maar Lakes in East Java

Desorption characteristics of total phosphorus and heavy metals from impervious urban surface sediments

Comparison of Topsoil Magnetic Properties Between the Loess Region in Tianshan Mountains and Loess Plateau, China, and Its Environmental Significance

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