Advances in Earth Science ›› 2015, Vol. 30 ›› Issue (9): 1050-1062. doi: 10.11867/j.issn.1001-8166.2015.09.1050

Special Issue: IODP

• Orginal Article • Previous Articles     Next Articles

The Relationship among Magnetic Susceptibility, Grain Size, Anhysteretic Remanent Magnetization and Clastic Mineral Abundance in Core QD189 Retrieved from Abyssal Plain of the South China Sea

Jiangyong Zhang( ), Zhimin Wang, Zhiliang Liao, Jinlian Wang, Xiaosui Li   

  1. Key Laboratory of Marine Mineral Resources, Guangzhou Marine Geological Survey, Ministry of Land and Resources, Guangzhou 510760, China
  • Received:2015-04-02 Revised:2015-07-30 Online:2015-09-20 Published:2015-09-20

Jiangyong Zhang, Zhimin Wang, Zhiliang Liao, Jinlian Wang, Xiaosui Li. The Relationship among Magnetic Susceptibility, Grain Size, Anhysteretic Remanent Magnetization and Clastic Mineral Abundance in Core QD189 Retrieved from Abyssal Plain of the South China Sea[J]. Advances in Earth Science, 2015, 30(9): 1050-1062.

Magnetism is probably one of key disciplines for breakthrough of paleoenvironment studies in abyssal plain of the South China Sea. Magnetic susceptibility is the most basic and general parameter reflecting information of magnetic minerals in sediment, while ARM is sensitive to the concentration of singe domain particles which is main carrier of remanent magnetization. In this study, we explore the geological implications of magnetic susceptibility and Anhysteretic Remanent Magnetization (ARM) in core QD189 retrieved from abyssal plain of the South China Sea integrating the data of grain size and clastic mineral abundance. In the segments with magnetic susceptibility great than 45×10-5 or the segments with depth less than 481 cm and magnetic susceptibility less than 45×10-5, there are similar fluctuations among magnetic susceptibility, the contents of 2~5 ϕ grain size range, ARM, and ARM@20mT , and the magnetic susceptibility changes in these segments is probably due to the fluctuations of contents of the soft magnetic multidomain grains within 2~5 ϕ grain size range. In the segments with depth from 808 cm to 488 cm and magnetic susceptibility less than 45×10-5, the coherences among the changes of magnetic susceptibility, the contents of 2~5 ϕ grain size range, ARM, and ARM@20mT are poor, and the mechanism of magnetic susceptibility changes is pending further research. 2~5 ϕ grain size range is an important coarse grain size component in QD189, and generally have a higher contents and bigger change ranges below the depth of 350 cm than above the depth of 350 cm. ARM@20mT can more accurately indicate the concentration of singe domain particles in QD189 than ARM, and except single-domain particles, the particles of the pseudo-single-domain and multidomain within 9~12 ϕ grain size range probably make some indispensablet contributions to ARM in the segment with 665~48 cm depth, and a part of ARM in segment with 548~310 cm depth is also derived from multidomain within 6~9 ϕ grain size range. Six volcanic actions are recognized by the corresponds among the extreme peak values of clastic mineral abundance, volcanic glass abundance and magnetic susceptibility. The distribution pattern of volcanic glass abundance reveals the prevalence of bioturbation in QD189.

No related articles found!
Viewed
Full text


Abstract