HEAVY MINERAL DISTRIBUTION AND MAGNETIC CHARACTERISTICS OF SURFACE SEDIMENTS IN THE NORTH BRANCH OF THE CHANGJIANG RIVER

ZHANG Fengyan; MENG Yi

doi:10.3724/SP.J.1140.2011.01031

2011 Vol. 31, No. 1

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Article navigation > Marine Geology & Quaternary Geology > 2011 > 31(1): 31-41

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ZHANG Fengyan, MENG Yi. HEAVY MINERAL DISTRIBUTION AND MAGNETIC CHARACTERISTICS OF SURFACE SEDIMENTS IN THE NORTH BRANCH OF THE CHANGJIANG RIVER[J]. Marine Geology & Quaternary Geology, 2011, 31(1): 31-41. doi: 10.3724/SP.J.1140.2011.01031

Citation:

ZHANG Fengyan, MENG Yi. HEAVY MINERAL DISTRIBUTION AND MAGNETIC CHARACTERISTICS OF SURFACE SEDIMENTS IN THE NORTH BRANCH OF THE CHANGJIANG RIVER[J]. Marine Geology & Quaternary Geology, 2011, 31(1): 31-41. doi: 10.3724/SP.J.1140.2011.01031

HEAVY MINERAL DISTRIBUTION AND MAGNETIC CHARACTERISTICS OF SURFACE SEDIMENTS IN THE NORTH BRANCH OF THE CHANGJIANG RIVER

State Key Laboratory of Estuary and Coastal Research, East China Normal University, Shanghai 200062, China

Received Date: 18 August 2010

Revised Date: 18 October 2010

Abstract

Abstract

Based on data from the surface sediments obtained from the north branch of the Changjiang River, this paper deals with the distribution of heavy minerals, the spatial variations of sediment magnetic properties and their controlling factors. Results indicate that hornblende and epidote dominate in heavy minerals in the research area, followed by mica and magnetite, but mineral assemblages vary in different sedimentary dynamic zones. The mica-stable mineral assemblage mainly occurs in sandspits and tidal sands,where, under strong hydrodynamic conditions, coarse sediments prevail and magnetic parameters, such as Xarm、Xfd%、Xarm/Xl and Xarm/SIRM are relatively low. The assemblage of hornblende-magnetite-carbonate is mainly distributed in river channels and tidal inlets, where hydrodynamic condition is relatively low and fine sediments, such as clayey silt, dominate, and as the result, magnetic parameters of Xarm、Xfd%、Xarm/Xl and Xarm/SIRM are quite high. Data suggest that the sediments in the north branch of the Changjiang River are mainly from the Changjiang River drainage. The distribution of heavy minerals and magnetic parameters are controlled by hydrodynamics, sediment types, source rocks and sediment transportation.
- the north branch of the Changjiang River /
- heavy minerals assemblage /
- magnetic parameters variation /
- sediment dynamic zone

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References

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