Magnetic properties of sediments from Lake Chaohu and its response to sedimentary dynamics

Xie, H., Zhang, W., Gu, C., Dai, X., Yu, L. and Dearing, J.A. (2006) Magnetic properties of sediments from Lake Chaohu and its response to sedimentary dynamics. Journal of Lake Science, 18 (1), 43-48.

Abstract

Magnetic study on core sediments from western Lake Chaohu and soils from Hangbu River Catchment suggests that magnetite is the dominant magnetic mineral, and soils from Hangbu River Catchment are the main source of lake sediments. Core AC1 near the bank shows higher proportion of sands and higher chi , SIRM values but lower chi sub(ARM)/SIRM values, indicating higher concentration of magnetite with coarse size. Core AC2 more far away from the bank shows lower proportion of sands and lower chi , SIRM values. The similar variations of sub(x) SIRM with, chi sub(ARM), and to a lesser degree with clay fraction, in combination with higher chi sub(ARM)/SIRM values, indicating lower concentration of magnetite with fine size. Magnetic properties of soils in the catchments indicate that skeletal soils with abundant sand and gravel fraction are magnetic strong which are contributed by coarse magnetite. Content of sand fraction in core is a reflection of water energy which is dependent on the distance to the bank. Therefore, the distinct magnetic properties of different cores are due to sedimentary dynamics. It is found that chi sub(ARM)/SIRM can be used to indicate the variation of clay contents in sediments.

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Contributors

Author: J.A. Dearing

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