Mineral magnetic characteristics of surficial sediments and their implications for identifying sedimentary environments at the Changjiang River mouth

Pan Dadong; Wang Zhanghua; Chen Ting; Gao Xiaoqin; Li Xiao; Zhan Qing

doi:10.3969/j.issn.0253-4193.2015.05.010

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Pan Dadong, Wang Zhanghua, Chen Ting, Gao Xiaoqin, Li Xiao, Zhan Qing. Mineral magnetic characteristics of surficial sediments and their implications for identifying sedimentary environments at the Changjiang River mouth[J]. Haiyang Xuebao, 2015, 37(5): 101-111. doi: 10.3969/j.issn.0253-4193.2015.05.010

Citation:

Pan Dadong, Wang Zhanghua, Chen Ting, Gao Xiaoqin, Li Xiao, Zhan Qing. Mineral magnetic characteristics of surficial sediments and their implications for identifying sedimentary environments at the Changjiang River mouth[J]. Haiyang Xuebao, 2015, 37(5): 101-111. doi: 10.3969/j.issn.0253-4193.2015.05.010

Citation:

Pan Dadong, Wang Zhanghua, Chen Ting, Gao Xiaoqin, Li Xiao, Zhan Qing. Mineral magnetic characteristics of surficial sediments and their implications for identifying sedimentary environments at the Changjiang River mouth[J]. Haiyang Xuebao, 2015, 37(5): 101-111. doi: 10.3969/j.issn.0253-4193.2015.05.010

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Mineral magnetic characteristics of surficial sediments and their implications for identifying sedimentary environments at the Changjiang River mouth

doi: 10.3969/j.issn.0253-4193.2015.05.010

1.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
2.
School of Geographical Sciences, East China Normal University, Shanghai 200062, China
3.
Shanghai Geological Survey Institute, Shanghai 200072, China

Received Date: 2014-10-27
Rev Recd Date: 2014-12-24

Abstract

Abstract

This study attempted to reveal the distribution patterns of magnetic minerals in the various sedimentary environments of Changjiang River mouth and adjacent continental shelf,and assessed proxies of magnetic parameters for identifying sedimentary environments,and the obtained results would be used to better perform the paleo-environmental reconstruction. We collected surficial sediments from the following six sedimentary environments at the Changjiang River mouth and adjacent continental shelf: distributary channel,river mouth shoal,delta front slope,prodelta,transitional regions and relict sand,and measured their grain size and magnetic properties. The results showed that,significantly high χ and SIRM values were obtained for sediments from the distributary channel and river mouth shoal,and high values of HIRM,χ_fd%,χ_ARM,χ_ARM/χ and χ_ARM/SIRM were measured for sediments from prodelta and delta front slope,indicating that the distribution of magnetic minerals was controlled by the dispersal of terrigenous sediments and hydrodynamic sorting. We proposed that for the Holocene stratigraphy,magnetic parameter assemblage of HIRM,χ_ARM,χ_ARM/χ and χ_ARM/SIRM could be the effective indicator for identifying prodelta and delta front slope,and χ、SIRM and S_-20mT can be used to recognize the distributary channel and river mouth shoal.
- hydrodynamic sorting,
- magnetic parameters,
- identification of sedimentary facies,
- the Changjiang River mouth

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