Magnetic susceptibility characteristics of surface sediments in Bering Sea and western Arctic Ocean: preliminary results

Wang Weiguo; Dai Shuang; Chen Lili; Wu Risheng; Yu Xingguang

doi:10.3969.issn.0253-4193.2014.09.014

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Wang Weiguo, Dai Shuang, Chen Lili, Wu Risheng, Yu Xingguang. Magnetic susceptibility characteristics of surface sediments in Bering Sea and western Arctic Ocean: preliminary results[J]. Haiyang Xuebao, 2014, 36(9): 121-131. doi: 10.3969.issn.0253-4193.2014.09.014

Citation:

Wang Weiguo, Dai Shuang, Chen Lili, Wu Risheng, Yu Xingguang. Magnetic susceptibility characteristics of surface sediments in Bering Sea and western Arctic Ocean: preliminary results[J]. Haiyang Xuebao, 2014, 36(9): 121-131. doi: 10.3969.issn.0253-4193.2014.09.014

Citation:

Wang Weiguo, Dai Shuang, Chen Lili, Wu Risheng, Yu Xingguang. Magnetic susceptibility characteristics of surface sediments in Bering Sea and western Arctic Ocean: preliminary results[J]. Haiyang Xuebao, 2014, 36(9): 121-131. doi: 10.3969.issn.0253-4193.2014.09.014

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Magnetic susceptibility characteristics of surface sediments in Bering Sea and western Arctic Ocean: preliminary results

doi: 10.3969.issn.0253-4193.2014.09.014

1.
Third Institute of Oceanography, State Oceanic Adiministration, Xiamen 361005, China
2.
Key Laboratory of Western China’s Environmental Systems Ministry of Education, Research School of Arid Environment and Climate Change, Lanzhou University, Lan Zhou 730000, China

Received Date: 2013-11-11
Rev Recd Date: 2013-12-26

Abstract

Abstract

The mass-dependent magnetic susceptibility (χ) with low and high frequency, anhysteretic susceptibility (χ_ARM) and temperature-dependent susceptibility (k-T) of 61 surface sediment samples obtained from Bering Sea and western Arctic Ocean were measured with an attempt to find the composition, province and transport of magnetic minerals, which is helpful to accurately decipher the paleo-climate and environmental information recorded by the magnetic parameters in Arctic area. The results show that the χ values of surface sediments have an evident regional difference. The χ values are commonly higher in Bering Sea than that in Chukchi Sea, and they are the lowest in the plains and ridges of high western Arctic Ocean. The χ values are the highest off the Yukon River estuary and to the south of St. Lawrence Island in Bering Sea shelf, decreasing northward and south-westward. The χ values are relatively higher in the central-eastern Chukchi Sea shelf than that off the Alaskan coast. The χ_ARM share the common variation trends of χ, however, the frequency-dependent susceptibility changes oppositely to that of χ. The analysis of k-T shows that the magnetic mineral in surface sediments in Aleutian Basin is maghemite, and off the Yukon River estuary and to the south of St. Lawrence Island is magnetite, and both maghemite and magnetite occur in the western shelf of Bering Sea and central-eastern shelf of Chukchi Sea. The magnetic mineral of surface sediment off the Alaskan coast is pyrite, while in the slope, plains and ridges of high western Arctic Ocean, the magnetic minerals are greigite and pyrite, but the content of greigite is higher in high latitude. The regional distribution of magnetic minerals in surface sediments is controlled by the sources of sediments, currents and bottom environments. The maghemite in the shelf of Bering Sea and Chukchi Sea is from the Asian main land, and the magnetite in eastern Bering Sea shelf is from the watershed of Yukon River. Pyrite off the Alaskan coast may be terrigenous or formed during the early diagenesis, while the greigite in high western Arctic Ocean is biogenous.
- Bering Sea,
- western Arctic Ocean,
- magnetic susceptibility,
- magnetic minerals,
- sediment sources

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References(52)

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