Magnetic properties of the core CX21 off the Yangtze Estuary and its influencing factors

MA Hong-lei; ZHANG Wei-guo; HU Zhong-xing; JIA Tie-fei; DONG Chen-yin; LIU Ying; 

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May 2012

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Article Navigation > Journal of East China Normal University (Natural Sciences) > 2012 > (3): 120-129,153

MA Hong-lei, ZHANG Wei-guo, HU Zhong-xing, JIA Tie-fei, DONG Chen-yin, LIU Ying, . Magnetic properties of the core CX21 off the Yangtze Estuary and its influencing factors[J]. Journal of East China Normal University (Natural Sciences), 2012, (3): 120-129,153.

Citation:

MA Hong-lei, ZHANG Wei-guo, HU Zhong-xing, JIA Tie-fei, DONG Chen-yin, LIU Ying, . Magnetic properties of the core CX21 off the Yangtze Estuary and its influencing factors[J]. Journal of East China Normal University (Natural Sciences), 2012, (3): 120-129,153.

Citation:

MA Hong-lei, ZHANG Wei-guo, HU Zhong-xing, JIA Tie-fei, DONG Chen-yin, LIU Ying, . Magnetic properties of the core CX21 off the Yangtze Estuary and its influencing factors[J]. Journal of East China Normal University (Natural Sciences), 2012, (3): 120-129,153.

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Magnetic properties of the core CX21 off the Yangtze Estuary and its influencing factors

1.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;
2.
College of Geography and Environmental Science, Zhejiang Normal University, Jinhua Zhejiang 321004, China;
3.
School of Urban and Tourism, Shanghai Normal University, Shanghai 200234, China

Received Date: 2011-02-01
Rev Recd Date: 2011-05-01
Publish Date: 2012-05-25

Abstract

Abstract

Core CX21(12230 E，3000 N) is 340 cm in length, obtained off the Yangtze Estuary, China. In this study, magnetic, geochemical and particle size analyses were conducted on sediments from the core CX21 to determine the major factors (including early diagenesis, particle size and sediment provenance) that control the down-core variations of magnetic properties. Results indicate that there are strong positive relationships between ARM, ARM/SIRM and ARM/ and the fractions finer than 16 m. , SIRM, fd and fd% display relatively weak, but positive correlations with the finer fractions (24 m and 48 m). This suggests that particle size plays an important role in the variation of magnetic properties. Iron species analysis using the BCR method indicates that sediments below 170 cm experienced more reducing environment than that above, which is consistent with the phenomena of stronger reductive diagenesis of magnetic minerals. Ti, an element insensitive to redox conditions, reveals sediment provenance changes in the core CX21. The increase of Ti toward the surface is accompanied by an increase of concentration related magnetic parameters ( and SIRM), suggesting that sediment source is also a main factor influencing magnetic properties. In spite of the difference in sedimentation rate and particle size composition, CX21 and the previously studied core Y7 show similar down core variations of magnetic properties, implying that magnetic properties can be used as a tool for core correlation in area off the Yangtze Estuary.
- Yangtze Estuary,
- magnetic properties,
- geochemistry,
- particle size,
- sediment source

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References(1)

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